| The MSX and later the MSX2 were an
attermpt to create a 'PC' before the PC!... based around the 8-bit
processor, an 'industry standard' compatible computer specification
was created, and any manufacturer could realease compatible
hardware. With 2 extension slots, the machine was upgradable, and the end user could be confident that their hardware and software would work whatever MSX machine they had! The last generation MSX - the Turbo-R was hugely powerful, and it's upgradability means the MSX now has the V9990... combining the Turbo-R and the V9990 (V9K) we effectively have what would have been the MSX3 if it had not been cancelled |
 |
 |
 |
| Because each MSX has different
hardware, we can only generalize, but here's the hardware
specification you can expect to see! Specs:
The V9990 can be used with the MSX, or MSX2 as well! - not just the Turbo-R Although the Turbo-R does not use a Z80, the R800 has effectively perfect compatibility, although it's 'only' 7mhz , it uses memory caching, and in optimum circumstances can perform 4x the speed of a 7mhz Z80 |
  |
ChibiAkumas Tutorials
Default Memory Map
| CBIOS MSX1 With cartridge in Slot 1/A
|
Panasonic FS-A1F MSX2 With cartridge in Slot 1/A
|
Panasonic FS-A1F MSX2 In basic
|
MSX Banks, Slots and Subslots... Oh my!:
The MSX memory layout is far more advanced and powerful than other 8
bits... unfortunately that tends to just mean that it's more annoying!
Take a look at an MSX! You'll see it has 1 or usually 2 cartridge slots...
right?... well actually there are two extra slots! 0 and 3 are 'internal'
slots used by the system itself... so we have slots 0-3... simple right...
actually no!
A 'Slot' can (but is not always) be split into 4 subslots... also numbered
0 to 3
EVERYTHING is in a slot, so RAM and ROM are in a slot somewhere... but
unfortunately they aren't in the same place on all machines!... Slot 1 and
2 are always the cartridge slots, but the RAM could be in slot 3, or in
slot 0-2 (slot 0 subslot 2)
It's all quite annoying!
The MSX memory map is split into 4 16K chunks, and each bank can be
'pointed' to one of the 3 slots... If the slot is expanded, each of these
banks can be set to a different subslot... so bank 0 can point to 0-0
(slot 0 subslot 0), and bank 1 can point to 0-2 (slot 0 subslot 2)...
while banks 2 and 3 could point to slot 3!
It needs to be understood that each slot has 4 banks for a full 64k - so
when bank 0 and 1 points to slot 3-0... they are different 16k
chunks... also in this case it is not possible to swap them round... Bank
0 (&0000-&3FFF) of the Z80 memory cannot
point to bank 1 (&4000-&7FFF) of the Slot
So suppose we have the following set up:
| Subslots | ||||
| Slot 0 | 0-0 | 0-1 | 0-2 | 0-3 |
| Slot 1 | 1 | Unexpanded slot | ||
| Slot 2 | 2-0 | 2-1 | 2-2 | 2-3 |
| Slot 3 | 3-0 | 3-1 | 3-2 | 3-3 |
| ROM | |
RAM | |
Cartridge | |
Empty |
| Port &A8 Bits | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Bank number | 3 (&C000-&FFFF) | 2 (&8000-&BFFF) | 1 (&4000-&7FFF) | 0 (&0000-&3FFF) | ||||
| Slot 0 &FFFF Bits | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Subslot number | 3 (&C000-&FFFF) | 2 (&8000-&BFFF) | 1 (&4000-&7FFF) | 0 (&0000-&3FFF) | ||||
| Port | Z80 Address range | Default value |
| &FC | &0000-&3FFF | 3 |
| &FD | &4000-&7FFF | 2 |
| &FE | &8000-&BFFF | 1 |
| &FF | &C000-&FFFF | 0 |
| Area | Z80 Address Range | Write
Address to change bank |
Default Value |
| 1 | &4000-&5FFF | &5000 | 0 |
| 2 | &6000-&7FFF | &7000 | 1 |
| 3 | &8000-&9FFF | &9000 | 2 |
| 4 | &A000-&BFFF | &B000 | 3 |
| System | MSX1 | MSX2 | MSX2+ | Turbo-R |
| Memory | 16k | 64k | 64k | 256K |
| Disk System? | NO | NO (sometimes) | NO (usually - not always) | YES |
| Mapper? | NO | NO | NO (sometimes) | YES |
Joystick Reading
| On the MSX the joysticks are connected to the AY data
port. We select an AY register with port &A0, we set one with port &A1, and read one with port &A2 First we need to set the bottom 4 bits of AY register 15 to 1 - this is to enable input of pins 6/7 of the joysick and to select Joystick 0. Next we select AY register 14 - This will allow us to read in from the joystick. Finally we read in from port &A2, this gets the actual state of the joystick and it's two fires in the format %--21RLDU
|
 |
The MSX1 VDP
| The MSX1 VDP has 16 KB of memory The Tile Pattern definitions use 1 byte per line for 1 bit pixel data, and 1 byte per line in the Colormap area to define color, one nibble for Foreground, and one nibble for background, in the format &FB The Tilemap has 2 modes... normal mode uses 256 definitions, in the area &0000-&07FF... Alternate mode uses 3 Pattern definitions, one for the first 1/3rd of the screen, another for the 2nd 3rd, and the final for the last 3rd... this allows us to simualte a bitmap screen, as we have enough tiles for each block of the screen to be unique, while only having one byte per tile in the tilemap! |
|
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8 | 9 | A | B | C | D | E | F |
| Reg | Meaning | Bit7 | Bit6 | Bit5 | Bit4 | Bit3 | Bit2 | Bit1 | Bit0 | |
| R#1 | mode register #1 | 0 | BL | IE0 | M1 | M2 | 0 | SI | MAG | SI=16x16 sprites / MAG = Big Sprites |
| R#5 | sprite attribute table (LOW) | A14 | A13 | A12 | A11 | A10 | A9 | A8 | A7 | |
| R#6 | sprite pattern generator table | 0 | 0 | A16 | A15 | A14 | A13 | A12 | A11 | |
| R#8 | mode register #2 | MS | LP | TP | CB | VR | 0 | SPD | BW |
| Address | Sprite | Bits | Details |
| $1B00 | 0 | YYYYYYYY | Y=Ypos |
| $1B01 | 0 | XXXXXXXX | X=Xpos |
| $1B02 | 0 | PPPPPPPP | P=Patternnum |
| $1B03 | 0 | E---CCCC | E=Extended X C=Color |
| $1B04 | 1 | YYYYYYYY | Y=Ypos |
| $1B05 | 1 | XXXXXXXX | X=Xpos |
| $1B06 | 1 | PPPPPPPP | P=Patternnum |
| $1B07 | 1 | E---CCCC | E=Extended X C=Color |
| .. | .. | .. | . . |
| $1BFD | 31 | YYYYYYYY | Y=Ypos |
| $1BFC | 31 | XXXXXXXX | X=Xpos |
| $1BFE | 31 | PPPPPPPP | P=Patternnum |
| $1BFF | 31 | E---CCCC | E=Extended X C=Color |
| 1 | 3 |
| 2 | 4 |
MSX 2 - V9938 Ports
|
V9990
|
Commands
If you want to know all the details, you should download the v9938 documentation here Status Registers
Note: The firmware expects status register S#0 to be selected in R#15 Interrupts will fire until S#0 is read... so you must do this if you write your own interrupt handler! |
| Reg | Meaning | Bit7 | Bit6 | Bit5 | Bit4 | Bit3 | Bit2 | Bit1 | Bit0 |
| R#0 | mode register #0 | 0 | DG | IE2 | IE1 | M5 | M4 | M3 | 0 |
| R#1 | mode register #1 (IE0= IM1 on) |
0 | BL | IE0 | M1 | M2 | 0 | SI | MAG |
| R#2 | pattern name table | 0 | A16 | A15 | A14 | A13 | A12 | A11 | A10 |
| R#3 | color table (LOW) | A13 | A12 | A11 | A10 | A9 | A8 | A7 | A6 |
| R#4 | pattern generator table | 0 | 0 | A16 | A15 | A14 | A13 | A12 | A11 |
| R#5 | sprite attribute table (LOW) | A14 | A13 | A12 | A11 | A10 | A9 | A8 | A7 |
| R#6 | sprite pattern generator table | 0 | 0 | A16 | A15 | A14 | A13 | A12 | A11 |
| R#7 | border color/character color at text mode | TC3 | TC2 | TC1 | TC0 | BD3 | BD2 | BD1 | BD0 |
| R#8 | mode register #2 | MS | LP | TP | CB | VR | 0 | SPD | BW |
| R#9 | mode register #3 | LN | 0 | S1 | S0 | IL | E0 | *NT | DC |
| R#10 | color table (HIGH) | 0 | 0 | 0 | 0 | 0 | A16 | A15 | A14 |
| R#11 | sprite attribute table (HIGH) | 0 | 0 | 0 | 0 | 0 | 0 | A16 | A15 |
| R#12 | character color at text blinks | T23 | T22 | T21 | T20 | BC3 | BC2 | BC1 | BC0 |
| R#13 | blinking period | ON3 | ON2 | ON1 | ON0 | OF3 | OF2 | OF1 | OF0 |
| R#14 | VRAM access address (HIGH) | 0 | 0 | 0 | 0 | 0 | A16 | A15 | A14 |
| A7 | A6 | A5 | A4 | A3 | A2 | A1 | A0 | ||
| 0 | RW | A13 | A12 | A11 | A10 | A9 | A8 | ||
| R#15 | indirect specification of S#n | 0 | 0 | 0 | 0 | S3 | S2 | S1 | S0 |
| R#16 | indirect specification of P#n
(Palette) |
0 | 0 | 0 | 0 | C3 | C2 | C1 | C0 |
| R#17 | indirect specification of R#n | AII | 0 | R5 | R4 | R3 | R2 | R1 | R0 |
| R#18 | screen location adjustment
(ADJUST) (Scroll) |
V3 | V2 | V1 | V0 | H3 | H2 | H1 | H0 |
| R#19 | scanning line number when the interrupt occurs | IL7 | IL6 | IL5 | IL4 | IL3 | IL2 | IL1 | IL0 |
| R#20 | color burst signal 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| R#21 | color burst signal 2 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 1 |
| R#22 | color burst signal 3 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 |
| R#23 | screen hard V-scroll |
DO7 | DO6 | DO5 | DO4 | DO3 | DO2 | DO1 | DO0 |
| R#25 |
Scroll Options (left side Mask / 2 page) | 0 | 0 | 0 | 0 | 0 | 0 | MSK | SP2 |
| R#26 |
Screen H-scroll (Bits 8-3) | 0 | 0 | H08 | H07 | H06 | H05 | H04 | H03 |
| R#27 | Screen H-scroll (Bits 2-0) | 0 | 0 | 0 | 0 | 0 | H02 | H01 | H00 |
| R#32 | SX: X-coordinate to be transferred (LOW) | SX7 | SX6 | SX5 | SX4 | SX3 | SX2 | SX1 | SX0 |
| R#33 | SX: X-coordinate to be transferred (HIGH) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | SX8 |
| R#34 | SY: Y-coordinate to be transferred (LOW) | SY7 | SY6 | SY5 | SY4 | SY3 | SY2 | SY1 | SY0 |
| R#35 | SY: Y-coordinate to be transferred (HIGH) | 0 | 0 | 0 | 0 | 0 | 0 | SY9 | SY8 |
| R#36 | DX: X-coordinate to be transferred to (LOW) | DX7 | DX6 | DX5 | DX4 | DX3 | DX2 | DX1 | DX0 |
| R#37 | DX: X-coordinate to be transferred to (HIGH) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | DX8 |
| R#38 | DY: Y-coordinate to be transferred to (LOW) | DY7 | DY6 | DY5 | DY4 | DY3 | DY2 | DY1 | DY0 |
| R#39 | DY: Y-coordinate to be transferred to (HIGH) | 0 | 0 | 0 | 0 | 0 | 0 | DY9 | DY8 |
| R#40 | NX: num. of dots to be transferred in X direction (LOW) | NX7 | NX6 | NX5 | NX4 | NX3 | NX2 | NX1 | NX0 |
| R#41 | NX: num. of dots to be transferred in X direction (HIGH) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | NX8 |
| R#42 | NY: num. of dots to be transferred in Y direction (LOW) | NY7 | NY6 | NY5 | NY4 | NY3 | NY2 | NY1 | NY0 |
| R#43 | NY: num. of dots to be transferred in Y direction (HIGH) | 0 | 0 | 0 | 0 | 0 | 0 | NY9 | NY8 |
| R#44 | CLR: for transferring data to CPU | - | - | - | - | C3 | C2 | C1 | C0 |
| - | - | - | - | - | C1 | C0 | G5 | ||
| C7 | C6 | C5 | C4 | C3 | C2 | C1 | C0 | ||
| R#45 | ARG: bank switching between VRAM
and expanded VRAM Comparison (EQ) / Draw Direction (MAJ) |
0 | MXC | MXD | MXS | DIY | DIX | EQ | MAJ |
| R#46 | CMR: send VDP command | CMD | CMD | CMD | CMD | MSK | MSK | MSK | MSK |
Masks (R46 bits 0-3)
| Code | Function | Bits |
| IMP |
PSET | %0000 (&00) |
| AND |
Mask | %0001 (&01) |
| OR |
%0010 (&02) | |
| XOR |
XOR draw | %0011 (&03) |
| NOT |
%0100 (&00) | |
| TIMP | Color 0 = Transparent | %1000 (&08) |
| TAND |
%1001 (&09) |
|
| TOR | %1010 (&0A) | |
| TXOR | %1011 (&0B) | |
| TNOT | %1100 (&0C) |
Draw Direction (R45 bits 2/3)
| Direction | Bits | |
| DownRight |
%00 (&00) | |
| DownLeft | %01 (&04) | |
| UpRight | %10 (&08) | |
| UpLeft | %11 (&0C) |
V9938 (MSX2) Command/Register usage
| HMMC (Define) |
HMMV (Fill) |
HMMM (Draw sprite) |
LMMM (Draw Transp) |
||
| First Used Register: | 36 |
36 |
32 |
32 |
|
| R#32 | SX: X-coordinate to be transferred (LOW) | SX-L | SX-L | ||
| R#33 | SX: X-coordinate to be transferred (HIGH) | SX-H | SX-H | ||
| R#34 | SY: Y-coordinate to be transferred (LOW) | SY-L | SY-L | ||
| R#35 | SY: Y-coordinate to be transferred (HIGH) | SY-H | SY-H | ||
| R#36 | DX: X-coordinate to be transferred to (LOW) | DX-L | DX-L | DX-L | DX-L |
| R#37 | DX: X-coordinate to be transferred to (HIGH) | DX-H | DX-H | DX-H | DX-H |
| R#38 | DY: Y-coordinate to be transferred to (LOW) | DY-L | DY-L | DY-L | DY-L |
| R#39 | DY: Y-coordinate to be transferred to (HIGH) | DY-H | DY-H | DY-H | DY-H |
| R#40 | NX: num. of dots to be transferred in X direction (LOW) | Width-L | Width-L | Width-L | Width-L |
| R#41 | NX: num. of dots to be transferred in X direction (HIGH) | Width-H | Width-H | Width-H | Width-H |
| R#42 | NY: num. of dots to be transferred in Y direction (LOW) | Height-L | Height-L | Height-L | Height-L |
| R#43 | NY: num. of dots to be transferred in Y direction (HIGH) | Height-H | Height-H | Height-H | Height-H |
| R#44 | CLR: for transferring data to CPU | FirstByte | - | - | - |
| R#45 | ARG: bank switching between VRAM and expanded VRAM | 0 | 0 | 0 | 0 |
| R#46 | CMR: send VDP command | &F0 | &C0 | &D0 | &98 (8=TIMP) |
Fields marked - can be anything / Empty fields do not need setting
V9990 - Ports, Registers and Commands
V9990 Commands| Name | Command | From | To | Units | ByteCode | Function |
| STOP | Stop | %00000000 | Stop processing current task | |||
| LMMC | Logical Move | CPU | VRAM | %00010000 | Fill Bytes from OUTI | |
| LMMV | Logical Move | VDP | VRAM | %00100000 | Flood fill a square with a single byte | |
| LMCM | Logical Move | VRAM | CPU | %00110000 | ||
| LMMM | Logical Move | VRAM | VRAM | dots | %01000000 | Copy an area from Vram to Vram fast (blit) |
| CMMC | Color-Develop | CPU | VRAM | %01010000 | ||
| CMMM | Color-Develop | VRAM | VRAM | %01110000 | ||
| BMXL | Linear BMP | L-VRAM | VRAM | %10000000 | ||
| BMLX | Linear BMP | VRAM | L-VRAM | %10010000 | ||
| BMLL | Linear BMP | L-VRAM | L-VRAM | %10100000 | ||
| LINE | Line | %10110000 | ||||
| SEARCH | Search | %11000000 | ||||
| POINT | Point | %11010000 | ||||
| PSET | Pset | %11100000 | ||||
| ADVANCE | %11110000 |
| Reg | Bit7 | Bit6 | Bit5 | Bit4 | Bit3 | Bit2 | Bit1 | Bit0 |
| Port &65 | TR | VR | HR | BD | 0 | MCS | EO | CE |
| Reg | Meaning | Bit7 | Bit6 | Bit5 | Bit4 | Bit3 | Bit2 | Bit1 | Bit0 |
| R#0 | Vram Write L | L | L | L | L | L | L | L | L |
| R#1 | Vram Write H | H | H | H | H | H | H | H | H |
| R#2 | Vram Write X | X | X | X | X | X | X | X | X |
| R#3 | Vram Read L | L | L | L | L | L | L | L | L |
| R#4 | Vram Read H | H | H | H | H | H | H | H | H |
| R#5 | Vram Read X | X | X | X | X | X | X | X | X |
| R#6 | Screen Mode | D | D | C | C | X | X | B | B |
| R#7 | Screen Mode | ||||||||
| R#8 | Control | D | S | Y | S | W | 0 | 1 | 0 |
| R#9 | Interrupt | ||||||||
| R#10 | Interrupt | ||||||||
| R#11 | Interrupt | ||||||||
| R#12 | Interrupt | ||||||||
| R#13 | Palette Control | ||||||||
| R#14 | Palette Pointer (autoinc) | Num | Num | Num | Num | Num | Num | Chn | Chn |
| R#15 | Back drop color | - | - | B | B | B | B | B | B |
| R#16 | Display Adjust | V | V | V | V | H | H | H | H |
| R#17 | Scroll Control | ||||||||
| R#18 | Scroll Control | ||||||||
| R#19 | Scroll Control | ||||||||
| R#20 | Scroll Control | ||||||||
| R#21 | Scroll Control | ||||||||
| R#22 | Scroll Control | ||||||||
| R#23 | Scroll Control | ||||||||
| R#24 | Scroll Control | ||||||||
| R#25 | Sprite Generator Base Address | ||||||||
| R#26 | LCD Control | ||||||||
| R#27 | Priority Control | ||||||||
| R#28 | Cursor Sprite Palette Offset | ||||||||
| R#32 | SX L | L | L | L | L | L | L | L | L |
| R#33 | SX H | H | H | H | H | H | H | H | H |
| R#34 | SY L | L | L | L | L | L | L | L | L |
| R#35 | SY H | H | H | H | H | H | H | H | H |
| R#36 | DX L | L | L | L | L | L | L | L | L |
| R#37 | DX H | H | H | H | H | H | H | H | H |
| R#38 | DY L | L | L | L | L | L | L | L | L |
| R#39 | DY H | H | H | H | H | H | H | H | H |
| R#40 | NX L | L | L | L | L | L | L | L | L |
| R#41 | NX H | H | H | H | H | H | H | H | H |
| R#42 | NY L | L | L | L | L | L | L | L | L |
| R#43 | NY H | H | H | H | H | H | H | H | H |
| R#44 | Move | 0 | 0 | 0 | 0 | DIY | DIX | NEQ | NAJ |
| R#45 | Logical Operation | 0 | 0 | 0 | TP | L11 | L10 | L01 | L00 |
| R#46 | Write Mask L | L | L | L | L | L | L | L | L |
| R#47 | Write Mask H | H | H | H | H | H | H | H | H |
| R#48 | Foreground Font Color L | L | L | L | L | L | L | L | L |
| R#49 | Foreground Font Color H | H | H | H | H | H | H | H | H |
| R#50 | Background Font Color L | L | L | L | L | L | L | L | L |
| R#51 | Background Font Color H | H | H | H | H | H | H | H | H |
| R#52 | Operation Code | C | C | C | C | - | - | - | - |
| R#53 | Search Command | B | B | B | B | B | B | B | B |
| R#54 | Search Command | - | - | - | - | - | B | B | B |
AY Sound Chip:
| Register | Meaning | Bit Meaning | Details |
| 0 | Tone Pitch L - Channel A | LLLLLLLL | Lower value = Higher pitch |
| 1 | Tone Pitch H - Channel A | ----HHHH | Lower value = Higher pitch |
| 2 | Tone Pitch L - Channel B | LLLLLLLL | Lower value = Higher pitch |
| 3 | Tone Pitch H - Channel B | ----HHHH | Lower value = Higher pitch |
| 4 | Tone Pitch L - Channel C | LLLLLLLL | Lower value = Higher pitch |
| 5 | Tone Pitch H - Channel C | ----HHHH | Lower value = Higher pitch |
| 6 | Noise Generator | ---NNNNN | Higer = Faster noise |
| 7 | Mixer | --NNNTTT | N=Noise T=Tone (Channel --CBACBA 1=mute 0=normal) |
| 8 | Amplitude - Channel A | ---EVVVV | E=Envelope (1=Enabled) VVVV=Volume |
| 9 | Amplitude - Channel B | ---EVVVV | E=Envelope (1=Enabled) VVVV=Volume |
| 10 | Amplitude - Channel C | ---EVVVV | E=Envelope (1=Enabled) VVVV=Volume |
| 11 | Envelope L (Volume over time) | LLLLLLLL | Lower=Faster Envelope |
| 12 | Envelope H (Volume over time) | HHHHHHHH | Lower=Faster Envelope |
| 13 | Envelope Selection | ----EEEE | Envelope number (See PDF) |
For more details, please see the AY
sound chip PDF
| Section | Address | Name | Details |
| Rom | 0000H | CHKRAM | RST0: tests RAM and sets RAM slot for the system |
| 0008H | SYNCHR | RST1: tests whether the character of [HL] is the specified | |
| 000CH | RDSLT | selects the slot corresponding to the value of A and reads | |
| 0010H | CHRGTR | RST2: gets a character or a token from BASIC text | |
| 0014H | WRSLT | selects the slot corresponding to the value of A and writes one byte | |
| 0018H | OUTDO | RST3: sends the value to current device | |
| 001CH | CALSLT | calls the routine in another slot inter-slot call | |
| 0020H | DCOMPR | RST4: compares the contents of HL and DE | |
| 0024H | ENASLT | selects the slot corresponding to the value of A and enables the slot to be used | |
| 0028H | GETYPR | RST5: returns the type of DAC decimal accumulator | |
| 0030H | CALLF | RST6: calls the routine in another slot. | |
| 0038H | KEYINT | RST7: executes the timer interrupt process routine | |
| 003BH | INITIO | initialises the device | |
| 003EH | INIFNK | initialises the contents of function keys | |
| 0041H | DISSCR | inhibits the screen display | |
| 0044H | ENASCR | displays the screen | |
| 0047H | WRTVDP | writes data in the VDP register | |
| 004AH | RDVRM | reads the contents of VRAM. | |
| 004DH | WRTVRM | writes data in VRAM | |
| 0050H | SETRD | sets VRAM address to VDP and enables it to be read. | |
| 0053H | SETWRT | sets VRAM address to VDP and enables it to be written. | |
| 0056H | FILVRM | fills the specified VRAM area with the same data. | |
| 0059H | LDIRMV | block transfer from VRAM to memory | |
| 005CH | LDIRVM | block transfer from memory to VRAM | |
| 005FH | CHGMOD | changes the screen mode. The palette is not initialised. | |
| 0062H | CHGCLR | changes the screen color | |
| 0066H | NMI | executes NMI Non-Maskable Interrupt handling routine | |
| 0069H | CLRSPR | initialises all sprites. | |
| 006CH | INITXT | initialises the screen to TEXT1 mode 40 x 24 | |
| 006FH | INIT32 | initialises the screen to GRAPHIC1 mode 32x24 | |
| 0072H | INIGRP | initialises the screen to the high-resolution graphics mode. | |
| 0075H | INIMLT | initialises the screen to MULTI color mode. | |
| 0078H | SETTXT | set only VDP in TEXT1 mode 40x24 | |
| 007BH | SETT32 | set only VDP in GRAPHIC1 mode 32x24 | |
| 007EH | SETGRP | set only VDP in GRAPHIC2 mode | |
| 0081H | SETMLT | set only VDP in MULTI color mode | |
| 0084H | CALPAT | returns the address of the sprite generator table | |
| 0087H | CALATR | returns the address of the sprite attribute table | |
| 008AH | GSPSIZ | returns the current sprite size | |
| 008DH | GRPPRT | displays a character on the graphic screen | |
| 0090H | GICINI | initialises PSG and sets the initial value for the PLAY statement | |
| 0093H | WRTPSG | writes data in the PSG register | |
| 0096H | RDPSG | reads the PSG register value | |
| 0099H | STRTMS | tests whether the PLAY statement is being executed as a background task. | |
| 009CH | CHSNS | tests the status of the keyboard buffer | |
| 009FH | CHGET | one character input waiting | |
| 00A2H | CHPUT | displays the character | |
| 00A5H | LPTOUT | sends one character to the printer | |
| 00A8H | LPTSTT | tests the printer status | |
| 00ABH | CNVCHR | test for the graphic header and transforms the code | |
| 00AEH | PINLIN | stores in the specified buffer the character codes input till STOP key. | |
| 00B1H | INLIN | same as PINLIN except that AUTFLG F6AAH is set | |
| 00B4H | QINLIN | executes INLIN with displaying "?" and one space | |
| 00B7H | BREAKX | tests Ctrl-STOP key. In this routine, interrupts are inhibited. | |
| 00C0H | BEEP | generates BEEP | |
| 00C3H | CLS | clears the screen | |
| 00C6H | POSIT | moves the cursor | |
| 00C9H | FNKSB | tests whether the function key display is active FNKFLG | |
| 00CCH | ERAFNK | erases the function key display | |
| 00CFH | DSPFNK | displays the function keys | |
| 00D2H | TOTEXT | forces the screen to be in the text mode | |
| 00D5H | GTSTCK | returns the joystick status | |
| 00D8H | GTTRIG | returns the trigger button status | |
| 00DBH | GTPAD | returns the touch pad status | |
| 00DEH | GTPDL | returns the paddle value | |
| 00E1H | TAPION | reads the header block after turning the cassette motor ON. | |
| 00E4H | TAPIN | reads data from the tape | |
| 00E7H | TAPIOF | stops reading the tape | |
| 00EAH | TAPOON | writes the header block after turning the cassette motor ON | |
| 00EDH | TAPOUT | writes data on the tape | |
| 00F0H | TAPOOF | stops writing to the tape | |
| 00F3H | STMOTR | sets the cassette motor action | |
| 0132H | CHGCAP | alternates the CAP lamp status | |
| 0135H | CHGSND | alternates the 1-bit sound port status | |
| 0138H | RSLREG | reads the contents of current output to the basic slot register | |
| 013BH | WSLREG | writes to the primary slot register | |
| 013EH | RDVDP | reads VDP status register | |
| 0141H | SNSMAT | reads the value of the specified line from the keyboard matrix | |
| 0144H | PHYDIO | Physical input/output for disk devices | |
| 014AH | ISFLIO | tests whether the device is active | |
| 014DH | OUTDLP | printer output | |
| 0156H | KILBUF | clears the keyboard buffer | |
| 0159H | CALBAS | executes inter-slot call to the routine in BASIC interpreter | |
| MSX2 | 015CH | SUBROM | executes inter-slot call to SUB-ROM |
| 015FH | EXTROM | executes inter-slot call to SUB-ROM | |
| 0168H | EOL | deletes to the end of the line | |
| 016BH | BIGFIL | same function as FILVRM. | |
| 016EH | NSETRD | enables VRAM to be read by setting the address | |
| 0171H | NSTWRT | enables VRAM to be written by setting the address | |
| 0174H | NRDVRM | reads the contents of VRAM | |
| 0177H | NWRVRM | writes data in VRAM | |
| Sub-Rom | 0089H | GRPRT | one character output to the graphic screen active only in screen modes 5 to 8 |
| 00C9H | NVBXLN | draws a box | |
| 00CDH | NVBXFL | draws a painted box | |
| 00D1H | CHGMOD | changes the screen mode | |
| 00D5H | INITXT | initialises the screen to TEXT1 mode 40 x 24 | |
| 00D9H | INIT32 | initialises the screen to GRAPHIC1 mode 32x24 | |
| 00DDH | INIGRP | initialises the screen to the high-resolution graphics mode | |
| 00E1H | INIMLT | initialises the screen to MULTI color mode | |
| 00E5H | SETTXT | sets VDP in the text mode 40x24 | |
| 00E9H | SETT32 | ses VDP in the text mode 32x24 | |
| 00EDH | SETGRP | sets VDP in the high-resolution mode | |
| 00F1H | SETMLT | sets VDP in MULTI color mode | |
| 00F5H | CLRSPR | initialises all sprites. | |
| 00F9H | CALPAT | returns the address of the sprite generator table | |
| 00FDH | CALATR | returns the address of the sprite attribute table | |
| 0101H | GSPSIZ | returns the current sprite size | |
| 0105H | GETPAT | returns the character pattern | |
| 0109H | WRTVRM | writes data in VRAM | |
| 010DH | RDVRM | reads the contents of VRAM | |
| 0111H | CHGCLR | changes the screen color | |
| 0115H | CLSSUB | clears the screen | |
| 011DH | DSPFNK | displays the function keys | |
| 012DH | WRTVDP | writes data in the VDP register | |
| 0131H | VDPSTA | reads the VDP register | |
| 013DH | SETPAG | switches the page | |
| 0141H | INIPLT | initialises the palette(the current palette is saved in VRAM | |
| 0145H | RSTPLT | restores the palette from VRAM | |
| 0149H | GETPLT | obtains the color code from the palette | |
| 014DH | SETPLT | sets the color code to the palette | |
| 017DH | BEEP | generates BEEP | |
| 0181H | PROMPT | displays the prompt | |
| 01ADH | NEWPAD | reads the status of mouse or light pen | |
| 01B5H | CHGMDP | changes VDP mode. The palette is initialised. | |
| 01BDH | KNJPRT | sends a kanki to the graphic screen modes 5 to 8 | |
| 01F5H | REDCLK | reads the clock data | |
| 01F9H | WRTCLK | writes the clock data | |
| Interslot | F380H | RDPRIM | read from basic slot |
| F385H | WRPRIM | write to basic slot | |
| F38CH | CLPRIM | basic slot call | |
| USR | F39AH | USRTAB | initial value: FCERR contents: starting address of assembly language program of USR function 0 to 9 ; the value before defining assembly language program |
| F3AEH | LINL40 | initial value: 39 contents: screen width per line at SCREEN 0 set by WIDTH statement at SCREEN 0 | |
| F3AfH | LINL32 | initial value: 32 contents: screen width per line at SCREEN 1 set by WIDTH statement at SCREEN 1 | |
| F3B0H | LINLEN | initial value: 29 contents: current screen width per line | |
| F3B1H | CRTCNT | initial value: 24 contents: number of lines of current screen | |
| F3B2H | CLMLST | initial value: 14 contents: horizontal location in the case that items are divided by commas in PRINT statement | |
| Screen 0 | F3B3H | TXTNAM | initial value: 0000H contents: pattern name table |
| F3B5H | TXTCOL | contents: unused | |
| F3B7H | TXTCGP | initial value: 0800H contents: pattern generator table | |
| F3B9H | TXTATR | contents: unused | |
| F3BBH | TXTPAT | contents: unused | |
| Screen 1 | F3BDH | T32NAM | initial value: 1800H contents: pattern name table |
| F3BFH | T32COL | initial value: 2000H contents: color table | |
| F3C1H | T32CGP | initial value: 0000H contents: pattern generator table | |
| F3C3H | T32ATR | initial value: 1B00H contents: sprite attribute table | |
| F3C5H | T32PAT | initial value: 3800H contents: sprite generator table | |
| Screen 2 | F3C7H | GRPNAM | initial value: 1800H contents: pattern name table |
| F3C9H | GRPCOL | initial value: 2000H contents: color table | |
| F3CBH | GRPCGP | initial value: 0000H contents: pattern generator table | |
| F3CDH | GRPATR | initial value: 1B00H contents: sprite attribute table | |
| F3CFH | GRPPAT | initial value: 3800H contents: sprite generator table | |
| Screen 3 | F3D1H | MLTNAM | initial value: 0800H contents: pattern name table |
| F3D3H | MLTCOL | contents: unused | |
| F3D5H | MLTCGP | initial value: 0000H contents: pattern generator table | |
| F3D7H | MLTATR | initial value: 1B00H contents: sprite attribute table | |
| F3D9H | MLTPAT | initial value: 3800H contents: sprite generator table | |
| Screen Extra | F3DBH | CLIKSW | initial value: 1 contents: key click switch 0 = OFF, otherwise = ON , set by <key click switch> of SCREEN statement |
| F3DCH | CSRY | initial value: 1 contents: Y-coordinate of cursor | |
| F3DDH | CSRX | initial value: 1 contents: X-coordinate of cursor | |
| F3DEH | CNSDFG | initial value: 0 contents: function key display switch 0 = display, otherwise = no display , set by KEY ON/OFF statement | |
| VDP bak | F3DFH | RG0SAV | initial value: 0 |
| F3E0H | RG1SAV | initial value: E0H | |
| F3E1H | RG2SAV | initial value: 0 | |
| F3E2H | RG3SAV | initial value: 0 | |
| F3E3H | RG4SAV | initial value: 0 | |
| F3E4H | RG5SAV | initial value: 0 | |
| F3E5H | RG6SAV | initial value: 0 | |
| F3E6H | RG7SAV | initial value: 0 | |
| F3E7H | STATFL | initial value: 0 contents: stores VDP status contents of status register 0, in MSX2 | |
| F3E8H | TRGFLG | initial value: FFH contents: stores trigger button status of joystick | |
| F3E9H | FORCLR | initial value: 15 contents: foreground color; set by color statement | |
| F3EAH | BAKCLR | initial value: 4 contents: background color; set by color statement | |
| F3EBH | BDRCLR | initial value: 7 contents: border color; set by color statement | |
| F3ECH | MAXUPD | initial value: JP 0000H C3H, 00H, 00H contents: used by CIRCLE statement internally | |
| F3EFH | MINUPD | initial value: JP 0000H C3H, 00H, 00H contents: used by CIRCLE statement internally | |
| F3F2H | ATRBYT | initial value: 15 contents: color code in using graphics | |
| PLAY | F3F3H | QUEUES | initial value: QUETAB F959H contents: points to queue table at the execution of PLAY statement |
| F3F5H | FRCNEW | , 1 initial value: 255 contents: used by BASIC interpreter internally | |
| Key Input | F3F6H | SCNCNT | initial value: 1 contents: interval for the key scan |
| F3F7H | REPCNT | initial value: 50 contents: delay until the auto-repeat of the key begins | |
| F3F8H | PUTPNT | initial value: KEYBUF FBF0H contents: points to address to write in the key buffer | |
| F3FAH | GETPNT | initial value: KEYBUF FBF0H contents: points to address to read from key buffer | |
| Casette | F3FCH | CS120 | - 1200 baud contents: 83 LOW01 ............ Low width representing bit 0 |
| F406H | LOW | initial value: LOW01, HIGH01 by default, 1200 baud contents: width of LOW and HIGH which represents bit 0 of current baud rate; set by <cassette baud rate> of SCREEN statement | |
| F408H | HIGH | initial value: LOW11, HIGH11 by default, 1200 baud contents: width of LOW and HIGH which represents bit 1 of current baud rate; set by <cassette baud rate> of SCREEN statement | |
| F40AH | HEADER | initial value: HEADLEN * 2/256 by default, 1200 baud contents: header bit for the short header of current baud rate HEADLEN = 2000 | |
| F40BH | ASPCT1 | contents: 256/aspect ratio; set by SCREEN statement to use in CIRCLE statement | |
| F40DH | ASPCT2 | contents: 256 * aspect ratio; set by SCREEN statement to use in CIRCLE statement | |
| F40FH | ENDPRG | initial value: ":" contents: false end of program for RESUME NEXT statement | |
| BASIC | F414H | ERRFLG | area to store the error number |
| F415H | LPTPOS | initial value: 0 contents: printer head location | |
| F416H | PRTFLG | flag whether to send to printer | |
| F417H | NTMSXP | printer 0 = printer for MSX, otherwise not | |
| F418H | RAWPRT | non-zero when printing in raw-mode | |
| F419H | VLZADR | address of character to be replaced by VAL function | |
| F41BH | VLZDAT | character to be replaced with 0 by VAL function | |
| F41CH | CURLIN | currently executing line number of BASIC | |
| F41FH | KBUF | crunch buffer; translated into intermediate language from BUF F55EH | |
| F55DH | BUFMIN | initial value: "," contents: used in INPUT statement | |
| F55EH | BUF | buffer to store characters typed; where direct statements are stored in ASCII code | |
| F660H | ENDBUF | prevents overflow of BUF F55EH | |
| F661H | TTYPOS | virtual cursor location internally retained by BASIC | |
| F662H | DIMFLG | used by BASIC internally | |
| F663H | VALTYP | used to identify the type of variable | |
| F664H | DORES | indicates whether stored word can be crunched | |
| F665H | DONUM | flag for crunch | |
| F666H | CONTXT | stores text address used by CHRGET | |
| F668H | CONSAV | stores token of constant after calling CHRGET | |
| F669H | CONTYP | type of stored constant | |
| F66AH | CONLO | value of stored constant | |
| F672H | MEMSIZ | highest address of memory used by BASIC | |
| F674H | STKTOP | address used as stack by BASIC; depending on CLEAR statement | |
| F676H | TXTTAB | starting address of BASIC text area | |
| F768H | TEMPPT | initial value: TEMPST F67AH contents: starting address of unused area of temporary descriptor | |
| F67AH | TEMPST | area for NUMTEMP | |
| F698H | DSCTMP | string descriptor which is the result of string function | |
| F69BH | FRETOP | starting address of unused area of string area | |
| F69DH | TEMP3 | used for garbage collection or by USR function | |
| F69FH | TEMP8 | for garbage collection | |
| F6A1H | ENDFOR | stores next address of FOR statement to begin execution from the next of FOR statement at loops | |
| F6A3H | DATLIN | line number of DATA statement read by READ statement | |
| F6A5H | SUBFLG | flag for array for USR function | |
| F6A6H | FLGINP | flag used in INPUT or READ | |
| F6A7H | TEMP | location for temporary reservation for statement code; used for variable pointer, text address, and others | |
| F6A9H | PTRFLG | 0 if there is not a line number to be converted,otherwise not | |
| F6AAH | AUTFLG | flag for AUTO command validity non-zero = valid, otherwise invalid | |
| F6ABH | AUTLIN | last input line number | |
| F6ADH | AUTINC | initial value: 10 contents: increment value of line number of AUTO command | |
| F6AFH | SAVTXT | area to store address of currently executing text; mainly used for error recovery by RESUME statement | |
| F6B3H | ERRLIN | line number where an error occurred | |
| F6B5H | DOT | last line number which was displayed in screen or entered | |
| F6B7H | ERRTXT | text address which caused an error; mainly used for error recovery by RESUME statement | |
| F6B9H | ONELIN | text address to which control jumps at error; set by ON ERROR GOTO statement | |
| F6BBH | ONEFLG | flag which indicates error routine execution non-zero = in execution, otherwise not | |
| F6BCH | TEMP2 | for temporary storage | |
| F6BEH | OLDLIN | line number which was terminated by Ctrl+STOP, STOP instruction, END instruction, or was executed last | |
| F6C0H | OLDTXT | address to be executed next | |
| F6C2H | VARTAB | starting address of simple variable; executing NEW statement causes [contents of TXTTAB(F676H + 2] to be set | |
| F6C4H | ARYTAB | starting address of array table | |
| F6C6H | STREND | last address of memory in use as text area or variable area | |
| F6C8H | DATPTR | text address of data read by executing READ statement | |
| F6CAH | DEFTBL | area to store type of variable for one alphabetical character; depends on type declaration such as CLEAR, DEFSTR,!, or # | |
| User Func | F6E4H | PRMSTK | previous definition block on stack for garbage collection |
| F6E6H | PRMLEN | number of bytes of objective data | |
| F6E8H | PARM1 | objective parameter definition table; PRMSIZ is number of bytes of definition block, initial value is 100 | |
| F74CH | PRMPRV | initial value: PRMSTK contents: pointer to previous parameter block for garbage collection | |
| F74EH | PRMLN2 | size of parameter block | |
| F750H | PARM2 | for parameter storage | |
| F7B4H | PRMFLG | flag to indicate whether PARM1 was searched | |
| F7B5H | ARYTA2 | end point of search | |
| F7B7H | NOFUNS | 0 if there is not an objective function | |
| F7B8H | TEMP9 | location of temporary storage for garbage collection | |
| F7BAH | FUNACT | number of objective functions | |
| F7BCH | SWPTMP | location of temporary storage of the value of the first variable of SWAP statement | |
| F7C4H | TRCFLG | trace flag non-zero = TRACE ON, 0 = TRACE OFF | |
| Math Pack | F7C5H | FBUFFR | used internally by Math-Pack |
| F7F0H | DECTMP | used to transform decimal integer to floating-point number | |
| F7F2H | DECTM2 | used at division routine execution | |
| F7F4H | DECCNT | used at division routine execution | |
| F7F6H | DAC | area to set the value to be calculated | |
| F806H | HOLD8 | register storage area for decimal multiplication | |
| F836H | HOLD2 | used internally by Math-Pack | |
| F83EH | HOLD | used internally by Math-Pack | |
| F847H | ARG | area to set the value to be calculated with DAC F7F6H | |
| F857H | RNDX | stores last random number in double precision real number; set by RND function | |
| Basic Interpreter | F85FH | MAXFIL | maximum file number; set by MAXFILES statement |
| F860H | FILTAB | starting address of file data area | |
| F862H | NULBUF | points to buffer used in SAVE and LOAD by BASIC interpreter | |
| F864H | PTRFIL | address of file data of currently accessing file | |
| F866H | RUNFLG | non-zero value if program was loaded and executed; used by R option of LOAD statement | |
| F866H | FILNAM | area to store filename | |
| F871H | FILNM2 | area to store filename | |
| F87CH | NLONLY | non-zero value if program is being loaded | |
| F87DH | SAVEND | end address of assembly language program to be saved | |
| F87FH | FNKSTR | area to store function key string 16 character x 10 | |
| F91FH | CGPNT | address to store character font on ROM | |
| F922H | NAMBAS | base address of current pattern name table | |
| F924H | CGPBAS | base address of current pattern generator table | |
| F926H | PATBAS | base address of current sprite generator table | |
| F928H | ATRBAS | base address of current sprite attribute table | |
| F92AH | CLOC | used internally by graphic routine | |
| F92CH | CMASK | used internally by graphic routine | |
| F92DH | MINDEL | used internally by graphic routine | |
| F92FH | MAXDEL | used internally by graphic routine | |
| Basic Circle | F931H | ASPECT | aspect ratio of the circle; set by <ratio> of CIRCLE statement |
| F933H | CENCNT | used internally by CIRCLE statement | |
| F935H | CLINEF | flag whether a line is drawn toward the center; specified by <angle> of CIRCLE statement | |
| F936H | CNPNTS | point to be plotted | |
| F938H | CPLOTF | used internally by CIRCLE statement | |
| F939H | CPCNT | number of one eight of the circle | |
| F93BH | CPNCNT8 | used internally by CIRCLE statement | |
| F93DH | CPCSUM | used internally by CIRCLE statement | |
| F93FH | CSTCNT | used internally by CIRCLE statement | |
| F941H | CSCLXY | scale of x and y | |
| F942H | CSAVEA | reservation area of ADVGRP | |
| F944H | CSAVEM | reservation area of ADVGRP | |
| F945H | CXOFF | x offset from the center | |
| F947H | CYOFF | y offset from the center | |
| Basic Paint | F949H | LOHMSK | used internally by PAINT statement |
| F94AH | LOHDIR | used internally by PAINT statement | |
| F94BH | LOHADR | used internally by PAINT statement | |
| F94DH | LOHCNT | used internally by PAINT statement | |
| F94FH | SKPCNT | skip count | |
| F951H | MIVCNT | movement count | |
| F953H | PDIREC | direction of the paint | |
| F954H | LFPROG | used internally by PAINT statement | |
| F955H | RTPROG | used internally by PAINT statement | |
| Basic Play | F956H | MCLTAB | points to the top of the table of PLAY macro or DRAW macro |
| F958H | MCLFLG | assignment of PLAY/DRAW | |
| F959H | QUETAB | queue table | |
| F971H | QUEBAK | used in BCKQ | |
| F975H | VOICAQ | queue of voice 1 (A) | |
| F9F5H | VOICBQ | queue of voice 2 (B) | |
| FA75H | VOICCQ | queue of voice 3 � | |
| FAF5H | DPPAGE | display page number | |
| FAF6H | ACPAGE | active page number | |
| FAF7H | AVCSAV | reserves AV control port | |
| FAF8H | EXBRSA | SUB-ROM slot address | |
| FAF9H | CHRCNT | character counter in the buffer; used in Roman-kana translation value is 0 <=n <=2 | |
| FAFAH | ROMA | area to store character in the buffer; used in Roman-kana translation Japan version only | |
| FAFCH | MODE | mode switch for VRAM size | |
| FAFDH | NORUSE | unused | |
| FAFEH | XSAVE | [ I OOOOOOO XXXXXXXX ] | |
| FB00H | YSAVE | [ x OOOOOOO YYYYYYYY ] | |
| FB02H | LOGOPR | logical operation code | |
| FB03H | RSTMP | work area for RS-232C or disk | |
| FB03H | TOCNT | used internally by RS-232C routine | |
| FB04H | RSFCB | FB04H + 0: LOW address of RS-232C FB04H + 1: HIGH address of RS-232C | |
| FB06H | RSIQLN | used internally by RS-232C routine | |
| FB07H | MEXBIH | FB07H +0: RST 30H 0F7H | |
| FB0CH | OLDSTT | FB0CH +0: RST 30H 0F7H | |
| FB12H | OLDINT | FB12H +0: RST 30H 0F7H | |
| FB17H | DEVNUM | used internally by RS-232C routine | |
| FB18H | DATCNT | FB18H +0: byte data | |
| FB1BH | ERRORS | used internally by RS-232C routine | |
| FB1CH | FLAGS | used internally by RS-232C routine | |
| FB1DH | ESTBLS | used internally by RS-232C routine | |
| FB1EH | COMMSK | used internally by RS-232C routine | |
| FB1FH | LSTCOM | used internally by RS-232C routine | |
| FB20H | LSTMOD | used internally by RS-232C routine | |
| DOS | FB21H to FB34H | reserved | used by DOS |
| PLAY | FB35H | PRSCNT | D1 to D0 string parse D7 = 0 1 pass |
| FB36H | SAVSP | reserves stack pointer in play | |
| FB38H | VOICEN | current interpreted voice | |
| FB39H | SAVVOL | reserves volume for the pause | |
| FB3BH | MCLLEN | used internally by PLAY statement | |
| FB3CH | MCLPTR | used internally by PLAY statement | |
| FB3EH | QUEUEN | used internally by PLAY statement | |
| FC3FH | MUSICF | interrupt flag for playing music | |
| FB40H | PLYCNT | number of PLAY statements stored in the queue | |
| Voice | FB41H | VCBA | static data for voice 0 |
| FB66H | VCBB | static data for voice 1 | |
| FB8BH | VCBC | static data for voice 2 | |
| Data | FBB0H | ENSTOP | flag to enable warm start by [SHIFT+Ctrl+Kana key] 0 = disable, otherwise enable |
| FBB1H | BASROM | indicates BASIC text location 0 = on RAM, otherwise in ROM | |
| FBB2H | LINTTB | line terminal table; area to keep information about each line of text screen | |
| FBCAH | FSTPOS | first character location of line from INLIN 00B1H of BIOS | |
| FBCCH | CODSAV | area to reserve the character where the cursor is stacked | |
| FBCDH | FNKSW1 | indicates which function key is displayed at KEY ON | |
| FBCEH | FNKFLG | contents: area to allow, inhibit, or stop the execution of the line defined in ON KEY GOSUB statement, or to reserve it for each function key; set by KEY(n ON/OFF/STOP statement | |
| FBD8H | ONGSBF | flag to indicate whether event waiting in TRPTBL FC4CH occurred | |
| FBD9H | CLIKFL | key click flag | |
| FBDAH | OLDKEY | key matrix status old | |
| FBE5H | NEWKEY | key matrix status new | |
| FBF0H | KEYBUF | key code buffer | |
| FC18H | LINWRK | temporary reservation location used by screen handler | |
| FC40H | PATWRK | temporary reservation location used by pattern converter | |
| FC48H | BOTTOM | installed RAM starting low address; ordinarily 8000H in MSX2 | |
| FC4AH | HIMEM | highest address of available memory; set by <memory upper limit> of CLEAR statement | |
| FC4CH | TRAPTBL | trap table used to handle interrupt; one table consists of three bytes, where first byte indicates ON/OFF/STOP status and the rest indicate the text address to be jumped to | |
| FC9AH | RTYCNT | used internally by BASIC | |
| FC9BH | INTFLG | if Ctrl+STOP is pressed, setting 03H here causes a stop | |
| FC9CH | PADY | Y-coordinate of the paddle | |
| FC9DH | PADX | X-coordinate of the paddle | |
| FC9EH | JIFFY | used internally by PLAY statement | |
| FCA0H | INTVAL | interval period; set by ON INTERVAL GOSUB statement | |
| FCA2H | INTCNT | counter for interval | |
| FCA4H | LOWLIM | used during reading from cassette tape | |
| FCA5H | WINWID | used during reading from cassette tape | |
| FCA6H | GRPHED | flag to send graphic character 1 = graphic character, 0 = normal character | |
| FCA7H | ESCCNT | area to count from escape code | |
| FCA8H | INSFLG | flag to indicate insert mode 0 = normal mode, otherwise = insert mode | |
| FCA9H | CSRSW | whether cursor is displayed 0 = no, otherwise = yes ; set by <cursor swicth> of LOCATE statement | |
| FCAAH | CSTYLE | cursor shape 0 = block, otherwise = underline | |
| FCABH | CAPST | CAPS key status 0 = CAP OFF, otherwise = CAP ON | |
| FCACH | KANAST | kana key status 0 = kaka OFF, otherwise = kana ON | |
| FCADH | KANAMD | kana key arrangement status 0 = 50-sound arrangement, otherwise = JIS arrangement | |
| FCAEH | FLBMEM | 0 when loading BASIC program | |
| FCAFH | SCRMOD | current screen mode number | |
| FCB0H | OLDSCR | screen mode reservation area | |
| FCB1H | CASPRV | character reservation area used by CAS: | |
| FCB2H | BRDATR | border color code used by PAINT; set by <border color> in PAINT statement | |
| FCB3H | GXPOS | X-coordinate | |
| FCB5H | GYPOS | Y-coordinate | |
| FCB7H | GRPACX | graphic accumulator X-coordinate | |
| FCB9H | GRPACY | graphic accumulator Y-coordinate | |
| FCBBH | DRWFLG | flag used in DRAW statement | |
| FCBCH | DRWSCL | DRAW scaling factor 0 = no scaling, otherwise = scaling | |
| FCBDH | DRWANG | angle at DRAW | |
| FCBEH | RUNBNF | flag to indicate BLOAD in progress, BSAVE in progress, or neither | |
| FCBFH | SAVENT | starting address of BSAVE | |
| FCC1H | EXPTBL | flag table for expansion slot; whether the slot is expanded | |
| FCC1H | * EXPTBL | ........... whether the basic slot is expanded or not [FCC1H-FCC4H = bit 7= expanded or not | |
| FCC5H | SLTTBL | current slot selection status for each expansion slot register | |
| FCC9H | SLTATR | reserves attribute for each slot | |
| FD09H | SLTWRK | allocates specific work area for each slot | |
| FD89H | PROCNM | stores name of expanded statement after CALL statement or expansion device after CALL statement or expansion device | |
| FD99H | DEVICE | used to identify cartridge device | |
| FD9AH | H.KEYI | beginning of MSXIO interrupt handling purpose: adds the interrupt operation such as RS-232C | |
| FD9FH | H.TIMI | MSXIO timer interrupt handling purpose: adds the timer interrupt handling | |
| FDA4H | H.CHPH | beginning of MSXIO CHPUT one character output purpose: connects other console device | |
| FDA9H | H.DSPC | beginning of MSXIO DSPCSR cursor display purpose: connects other console device | |
| FDAEH | H.ERAC | beginning of MSXIO ERACSR erase cursor purpose: connects other console device | |
| FDB3H | H.DSPF | beginning of MSXIO DSPFNK function key display purpose: connects other console device | |
| FDB8H | H.ERAF | beginning of MSXIO ERAFNK erase function key purpose: connects other console device | |
| FDBDH | H.TOTE | beginning of MSXIO TOTEXT set screen in text mode purpose: connects other console device | |
| FDC2H | H.CHGE | beginning of MSXIO CHGET get one character purpose: connects other console device | |
| FDC7H | H.INIP | beginning of MSXIO INIPAT character pattern initialisation purpose: uses other character set | |
| FDCCH | H.KEYC | beginning of MSXIO KEYCOD key code translation purpose: uses other key arrangement | |
| FDD1H | H.KYEA | beginning of MSXIO NMI routine Key Easy purpose: uses other key arrangement | |
| FDD6H | H.NMI | beginning of MSXIO NMI non-maskable interrupt purpose: handles NMI | |
| FDDBH | H.PINL | beginning of MSXIO PINLIN one line input purpose: uses other console input device or other input method | |
| FDE0H | H.QINL | beginning of MSXINL QINLIN one line input displaying "?" purpose: uses other console input device or other input method | |
| FDE5H | H.INLI | beginning of MSXINL INLIN one line input purpose: uses other console input device or other input method | |
| FDEAH | H.ONGO | beginning of MSXSTS INGOTP ON GOTO purpose: uses other interrupt handling device | |
| FDEFH | H.DSKO | beginning of MSXSTS DSKO$ disk output purpose: connects disk device | |
| FDF4H | H.SETS | beginning of MSXSTS SETS set attribute purpose: connects disk device | |
| FDF9H | H.NAME | beginning of MSXSTS NAME rename purpose: connects disk device | |
| FDFEH | H.KILL | beginning of MSXSTS KILL delete file purpose: connects disk device | |
| FE03H | H.IPL | beginning of MSXSTS IPL initial program loading purpose: connects disk device | |
| FE08H | H.COPY | beginning of MSXSTS COPY file copy purpose: connects disk device | |
| FE0DH | H.CMD | beginning of MSXSTS CMD expanded command purpose: connects disk device | |
| FE12H | H.DSKF | beginning of MSXSTS DSKF unusde disk space purpose: connects disk device | |
| FE17H | H.DSKI | beginning of MSXSTS DSKI disk input purpose: connects disk device | |
| FE1CH | H.ATTR | beginning of MSXSTS ATTR$ attribute purpose: connects disk device | |
| FE21H | H.LSET | beginning of MSXSTS LSET left-padded assignment purpose: connects disk device | |
| FE26H | H.RSET | beginning of MSXSTS RSET right-padded assignment purpose: connects disk device | |
| FE2BH | H.FIEL | beginning of MSXSTS FIELD field purpose: connects disk device | |
| FE30H | H.MKI$ | beginning of MSXSTS MKI$ create integer purpose: connects disk device | |
| FE35H | H.MKS$ | beginning of MSXSTS MKS$ create single precision real purpose: connects disk device | |
| FE3AH | H.MKD$ | beginning of MSXSTS MKD$ create double precision real purpose: connects disk device | |
| FE3FH | H.CVI | beginning of MSXSTS CVI convert integer purpose: connects disk device | |
| FE44H | H.CVS | beginning of MSXSTS CVS convert single precision real purpose: connects disk device | |
| FE49H | H.CVD | beginning of MSXSTS CVS convert double precision real purpose: connects disk device | |
| FE4EH | H.GETP | SPDSK GETPTR get file pointer purpose: connects disk device | |
| FE53H | H.SETF | SPCDSK SETFIL set file pointer purpose: connects disk device | |
| FE58H | H.NOFO | SPDSK NOFOR OPEN statement without FOR purpose: connects disk device | |
| FE5DH | H.NULO | SPCDSK NULOPN open unused file purpose: connects disk device | |
| FE62H | H.NTFL | SPCDSK NTFLO file number is not 0 purpose: connects disk device | |
| FE67H | H.MERG | SPCDSK MERGE program file merge purpose: connects disk device | |
| FE6CH | H.SAVE | SPCDSK SAVE save purpose: connects disk device | |
| FE71H | H.BINS | SPCDSK BINSAV save in binary purpose: connects disk device | |
| FE76H | H.BINL | SPCDSK BINLOD load in binary purpose: connects disk device | |
| FD7BH | H.FILE | SPCDSK FILES displey filename purpose: connects disk device | |
| FE80H | H.DGET | SPCDSK DGET disk GET purpose: connects disk device | |
| FE85H | H.FILO | SPCDSK FILOU1 file output purpose: connects disk device | |
| FE8AH | H.INDS | SPCDSK INDSKC disk attribute input purpose: connects disk device | |
| FE8FH | H.RSLF | SPCDSK; re-select previous drive purpose: connects disk device | |
| FE94H | H.SAVD | SPCDSK; reserve current disk purpose: connects disk device | |
| FE99H | H.LOC | SPCDSK LOC function indicate location purpose: connects disk device | |
| FE9EH | H.LOF | SPCDSK LOC function file length purpose: connects disk device | |
| FEA3H | H.EOF | SPCDSK EOF function end of file purpose: connects disk device | |
| FEA8H | H.FPOS | SPCDSK FPOS function file location purpose: connects disk device | |
| FEADH | H.BAKU | SPCDSK BAKUPT backup purpose: connects disk device | |
| FEB2H | H.PARD | SPCDEV PARDEV get peripheral name purpose: expands logical device name | |
| FEB7H | H.NODE | SPCDEV NODEVN no device name purpose: sets default device name to other device | |
| FEBCH | H.POSD | SPCDEV POSDSK purpose: connects disk device | |
| FEC1H | H.DEVN | SPCDEV DEVNAM process device name purpose: expands logical device name | |
| FEC6H | H.GEND | SPCDEV GENDSP FEC6H purpose: expands logical device name | |
| FECBH | H.RUNC | BIMISC RUNC clear for RUN | |
| FED0H | H.CLEAR | BIMISC CLEARC clear for CLEAR statement | |
| FED5H | H.LOPD | BIMISC LOPDFT set loop and default value purpose: uses other default value for variable | |
| FEDAH | H.STKE | BIMISC STKERR stack error | |
| FEDFH | H.ISFL | BIMISC ISFLIO file input-output or not | |
| FEE4H | H.OUTD | meaning: BIO OUTDO execute OUT | |
| FEE9H | H.CRDO | BIO CRDO execute CRLF | |
| FEEEH | H.DSKC | BIO DSKCHI input disk attribute | |
| FEF3H | H.DOGR | GENGRP DOGRPH execute graphic operation | |
| FEF8H | H.PRGE | BINTRP PRGEND program end | |
| FEFDH | H.ERRP | BINTRP ERRPTR error display | |
| FF02H | H.ERRF | BINTRP | |
| FF07H | H.READ | BINTRP READY | |
| FF0CH | H.MAIN | BINTRP MAIN | |
| FF11H | H.DIRD | BINTRP DIRDO execute direct statement | |
| FF16H | H.FINI | BINTRP | |
| FF1BH | H.FINE | BINTRP | |
| FF20H | H.CRUN | BINTRP | |
| FF20H | H.CRUN | BINTRP | |
| FF25H | H.CRUS | BINTRP | |
| FF2AH | H.ISRE | BINTRP | |
| FF2FH | H.NTFN | BINTRP | |
| FF34H | H.NOTR | BINTRP | |
| FF39H | H.SNGF | BINTRP | |
| FF3EH | H.NEWS | BINTRP | |
| FF43H | H.GONE | BINTRP | |
| FF48H | H.CHRG | BINTRP | |
| FF4DH | H.RETU | BINTRP | |
| FF52H | H.PRTF | BINTRP | |
| FF57H | H.COMP | BINTRP | |
| FF5CH | H.FINP | BINTRP | |
| FF61H | H.TRMN | BINTRP | |
| FF66H | H.FRME | BINTRP | |
| FF6BH | H.NTPL | BINTRP | |
| FF70H | H.EVAL | BINTRP | |
| FF75H | H.OKNO | BINTRP | |
| FF7AH | H.FING | BINTRP | |
| FF7FH | H.ISMI | BINTRP ISMID$ MID$ or not | |
| FF84H | H.WIDT | BINTRP WIDTHS WIDTH | |
| FF89H | H.LIST | BINTRP LIST | |
| FF8EH | H.BUFL | BINTRP BUFLIN buffer line | |
| FF93H | H.FRQI | BINTRP FRQINT | |
| FF98H | H.SCNE | BINTRP | |
| FF9DH | H.FRET | BINTRP FRETMP | |
| FFA2H | H.PTRG | BIPTRG PTRGET get pointer purpose: uses variable other than default value | |
| FFA7H | H.PHYD | MSXIO PHYDIO physical disk input-output purpose: connects disk device | |
| FFACH | H.FORM | MSXIO FORMAT format disk purpose: connects disk device | |
| FFB1H | H.ERRO | BINTRP ERROR purpose: error handling for application program | |
| FFB6H | H.LPTO | MSXIO LPTOUT printer output purpose: uses printer other than default value | |
| FFBBH | H.LPTS | MSXIO LPTSTT printer status purpose: uses printer other than default value | |
| FFC0H | H.SCRE | MSXSTS SCREEN statement entry purpose: expands SCREEN statement | |
| FFC5H | H.PLAY | MSXSTS PLAY statement entry purpose: expands PLAY statement | |
| FFCAH | FCALL | hook used by expanded BIOS | |
| FFCFH | DISINT | used by DOS | |
| FFD4H | ENAINT | used by DOS |
Cartridge Header
| Address | Bytes | Purpose | Detail | Sample |
| &0000 | 2 | ID | Fixed | AB |
| &0002 | 2 | INIT | Start Address | &4010 |
| &0004 | 2 | STATEMENT | Call address | &0000 |
| &0006 | 2 | DEVICE | Dev address | &0000 |
| &0008 | 2 | TEXT | Basic Address | &0000 |
| &0010 | Program Code� |
Disk File Header
| Position | Bytes | Content | Details | Example |
| &0000 | 1 | &FE | Magic Number | &FE |
| &0001 | 2 | Load address | Address to load into memory | &810A |
| &0003 | 2 | End Address | Last address in memory (Load address+Size) | &910A |
| &0005 | 2 | Execute Address | Address to call program | &810A |
| &0007 | Program Code | |||
MSX and MSX2 Programming Tutorials:
Lesson P5 - Bitmap graphics on the TI-83 and MSX
MSX and MSX2 Links:
OpenMSX - The best MSX emulator - you'll need to find your own roms for disk system emulaton (For disk images I reccomend emulating the hb-f1xdj)