With a pair of 6809 CPU's it was widely popular in Japan, and is one of the few 6809 computers released.
In these tutorials we'll learn the about the FM7, and write some simple programs for it
| The FM-7 is one of a series of
Fujitsu computers released in Japan With a pair of 6809 CPU's it was widely popular in Japan, and is one of the few 6809 computers released. In these tutorials we'll learn the about the FM7, and write some simple programs for it |
|
|
|
|
 Vectrex! |
Useful Links!
PlayVectrex -
Vectrex Programming Manuals
| Lesson P3 - Joystick reading on the Vectrex [VTX] |
| Lesson P6 - Vector drawing on the Vectrex [VTX] |
| Lesson P7 - Making Sound with the AY-3-8910 on the Vectrex and FM7 [VTX] [FM7] |
Memory Map
| Address | Purpose |
| $0000 | Cartridge Rom |
| $8000 | Unused |
| $C800 | Bios RAM |
| $C880 | User RAM |
| $CC00 | unused |
| $D000 | PIA |
| $D010 | PIA Mirror |
| $E000 | Minestorm ROM |
| $F000 | Bios ROM |
OS Calls
| Group | Address | Name | AltName | DP (Entry/Exit) | Details | Example |
| Init | $F18B | INITALL | INTALL | $D0 | Full Vectrex initialization | |
| Init | $F164 | INITMSC | INTMSC | $C8 | Initialize misc. parameters | |
| Init | $F14C | INITPIA | INTPIA | $D0 | Initialize PIA | |
| Init | $F272 | INITPSG | INTPSG | $D0 | Initialize the �REQx� area (sound mirror). | |
| Init | $F533 | IREQ | INTREQ | - | Initialize the 'REQZ' area | |
| Init | $F000 | POWER | PWRUP | - | Power-up handler | |
| Drawing | $F2E6 | DEFLOK | ---C1:C1048576B1:B1048576 | $D0 | Overcome scan collapse circuitry | |
| Drawing | $F192 | FRAM20 | FRWAIT | $D0 | Wait for frame boundary (Pause for next frame) | |
| Drawing | $F29D | INT1Q | - | $D0 | Set beam intensity 1/4 ($1F) | |
| Drawing | $F2A5 | INT3Q | - | $D0 | Set beam intensity 3/4 ($5F) | |
| Drawing | $F2AB | INTENS | - | $D0 | Set beam intensity A (0-127) | |
| Drawing | $F2A9 | INTMAX | - | $D0 | Set beam intensity 4/4 (7F) | |
| Drawing | $F2A1 | INTMID | INT2Q | $D0 | Set beam intensity 2/4 ($3F) | |
| Drawing | $F30C | POSIT1 | - | $D0 | Position relative vector List X (1x scale) | db Y,X |
| Drawing | $F308 | POSIT2 | - | $D0 | Position relative vector (2x scale) | |
| Drawing | $F30E | POSITB | - | $D0 | Position relative vector list X Scale B | |
| Drawing | $F2FC | POSITD | - | $D0 | Position relative vector (X,Y)=(B,A) scale 1x | |
| Drawing | $F312 | POSITN | - | $D0 | Position relative vector (X,Y)=(B,A) scale T1LOLC | |
| Drawing | $F310 | POSITX | - | $D0 | Release integrators and position beam, lfrom X | db Y,X |
| Drawing | $F2F2 | POSWID | - | $D0 | Release integrators and position beam using 16-bit (Y,X) values from address X | dw Y,X |
| Drawing | $F34F | CZERO | ZEGO | $D0 | Depending
ZSKIP, zero integrators and set the sample / hold for active ground. |
|
| Drawing | $F35B | ZEREF | ZEREF | $D0 | Set active ground sample / hold to zero volts. | |
| Drawing | $F34A | ZERO.DP | ZERO.DP | $D0 | DP=$D0... Zero integrators and set active ground | |
| Drawing | $F36B | ZERO. | ZERO | $D0 | Zero the integrators only | |
| Drawing | $F354 | ZEROIT | ZEROIT | $D0 | Zero integrators and set active ground | |
| Diffy | $F610 | DANROT | DROT | - | Rotate �Diffy� style list A=Angle B=no of Vectors X=Source list U=Dest | |
| Diffy | $F433 | DASHE | DSHDF1 | $D0 | Draw dashed lines from 'DIFFY' list | |
| Diffy | $F434 | DASHEL | DSHDF | $D0 | Draw dashed lines from 'DIFFY' list A=Vectors-1 X=List | |
| Diffy | $F437 | DASHY | DASHDF | $D0 | Draw dashed lines from 'DIFFY' list X | |
| Diffy | $F3DF | DIFFAB | - | $D0 | Draw from 'DIFFY' style list (B,A)=(X,Y) | |
| Diffy | $F3CE | DIFFAX | - | $D0 | Draw from 'DIFFY' style list X=List | |
| Diffy | $F3D8 | DIFFX | TDIFFY | $D0 | Draw from 'DIFFY' style list A=Vectors-1 B=Scale X=List | |
| Diffy | $F3DD | DIFFY | - | $D0 | Draw from 'DIFFY' style list X=List | |
| Diffy | $F3D6 | DIFLST | - | $D0 | Draw from 'DIFFY' style list | |
| Diffy | $F616 | DIFROT | ADROT | - | Rotate �DIFFY� style list X=Source U=Dest ANGLE | |
| Diffy | $F3D2 | DIFTIM | - | $D0 | Draw from 'DIFFY' style list B=scale X=List | |
| Diffy | $F3DA | DIFTLS | LDIFFY | $D0 | Draw from 'DIFFY' style list A=Vectors-1, X=List | |
| Diffy | $F613 | DISROT | BDROT | - | 'DIFFY' style rotate B=vector count X=source list U=Dest | |
| Duffy | $F3BE | DUFFAB | - | $D0 | Move a single
vector from the current beam position using the relative vector
values given in �D� (X,Y)=(B,A) |
|
| Duffy | $F3AD | DUFFAX | - | $D0 | Draw from 'DUFFY' style list X=list | |
| Duffy | $F3BC | DUFFY | - | $D0 | Draw from 'DUFFY' style list X=list | |
| Duffy | $F3BC | DUFLTLS | TDUFFY | $D0 | Draw from 'DUFFY' style list B=length X=List | |
| Duffy | $F3B5 | DUFLST | - | $D0 | Draw from 'DUFFY' style list X=list | |
| Duffy | $F3B1 | DUFTIM | - | $D0 | Draw from 'DUFFY' style list B=length X=List | |
| Diffy | $F3B9 | DUFLST | $D0 | A=Vectors-1 X=List | ||
| Dot | $F2D5 | DIFDOT | - | $D0 | Draw dots according to 'DIFFY' format X=List pointer | |
| Dot | $F2C5 | DOT | - | $D0 | Turn on beam for dot | |
| Dot | $F2C3 | DOTAB | - | $D0 | Draw Dot at relative (X,Y) pos (B,A) | |
| Dot | $F2DE | DOTPAK | DOTPCK | $D0 | Draw dots according to 'PACKET' format X=list | |
| Dot | $F2BE | DOTTIM | - | $D0 | Draw one dot from 'DIFFY' style list B=on time X=List | |
| Dot | $F2C1 | DOTX | - | $D0 | Draw one dot from 'DIFFY' style list X | |
| Packet | $F46E | DASHY3 | DASHPK | $D0 | Draw dashed lines from 'PACKET' list X | |
| Packet | $F408 | PAC1X | PACK1X | $D0 | Draw according to �Packet� style list X scale 1x | |
| Packet | $F404 | PAC2X | PACK2X | $D0 | Draw according to �Packet� style list X scale 2x | |
| Packet | $F40E | PACB | TPACK | $D0 | Draw from 'PACKET' list X B=Scale | |
| Packet | $F410 | PACKET | - | $D0 | Draw according to �Packet� style list X | |
| Packet | $F40C | PACXX | LPACK | $D0 | Draw from 'PACKET' style list X=list | |
| Packet | $F61F | POTATA | PROT | - | 'PACKET' style rotate A=Angle X=Source List U=Dest List | |
| Packet | $F622 | POTATE | APROT | - | 'PACKET' style rotate | |
| Raster | $F37A | POSDRAS | MSSPOS | $D0 | Print $80 terminated String U at (X,Y) relative pos (B,A) | |
| Raster | $F378 | POSNRAS | RSTPOS | $D0 | Display raster message from U | |
| Raster | $F498 | RASTER | MRASTR | $D0 | Display raster string from MESSAGE | |
| Raster | $F495 | RASTUR | RASTER | $D0 | Display raster string from U | |
| Raster | $F87C | SADD | SCRADD | - | Add contents of score D to BCD at address X | |
| Raster | $F880 | SADD2 | STKADD | - | Add stack to indicated score | |
| Raster | $F85E | SHADD | BYTADD | - | Add contents of 'A' to indicated score | A = 2-digit
BCD number X = Score field pointer |
| Raster | $F391 | SHIPSAT | SHIPX | $D0 | Display markers (count remaining) | |
| Raster | $F393 | SHIPSHO | DSHIP | $C8 | Display markers (count remaining) A=ascii B=remaining X=Pos | |
| Raster | $F373 | SIZPRAS | RSTSIZ | $D0 | Display raster message from U | |
| Raster | $F38C | TEXPOS | TXTPOS | $D0 | Draw Strings from U (0 terminated) | dc.b
Y,X,"TXT",$80 dc.b Y,X,"TXT",$80 dc.b 0 |
| Raster | $F385 | TEXSIZ | TXTSIZ | $D0 | Display raster message from U | |
| Controller | $F1B4 | ENPUT | DBNCE | $D0 | Read controller switches and debounce switch status. (A=Response mask) | |
| Controller | $F8D8 | HIGHSCR | HISCR | - | Calculate high score and save for logo C=Score Field U=Highscore | |
| Controller | $F1BA | INPUT | - | $D0 | Read controller buttons | |
| Controller | $F7A9 | OPTION | SELOPT | - | Fetch number of players and options from player A + B = No of players (0-9) | |
| Controller | $F1F8 | PANG | JOYBIT | $D0 | Read joystick UDLR | |
| Controller | $F1F5 | PBANG4 | JOYSTK | $D0 | Read the absolute position of the controller joysticks. | |
| Controller | $F84F | SCLR | - | - | Clear indicated score X | |
| Controller | $F8C7 | WINNER | - | - | Determine highest score X or U | |
| Rotate | $F610 | DANROT | DROT | - | 'DIFFY' style rotate | |
| Rotate | $F616 | DIFROT | ADROT | - | 'DIFFY' style rotate | |
| Rotate | $F613 | DISROT | BDROT | - | 'DIFFY' style rotate | |
| Rotate | $F61F | POTATA | PROT | - | 'PACKET' style rotate | |
| Rotate | $F622 | POTATE | APROT | - | 'PACKET' style rotate X=Soource U=Dest (ANGLE) | |
| Rotate | $F5FF | RATOT | LROT90 | $C8 | Rotate a single line A=Initial Y B=Angle | |
| Rotate | $F603 | ROTAR | ALNROT | $C8 | Rotate a single line A=Initial Y (ANGLE) | |
| Rotate | $F601 | ROTOR | LNROT | $C8 | Rotate a single line A=Initial Y B=Angle | |
| Maths | $F584 | ABSVAL | ABSAB | - | Form absolute value for 'A' & 'B' registers | |
| Maths | $F58B | AOK | ABSB | - | Form absolute value for 'B' register | |
| Maths | $F57E | BITE | DECBIT | - | Decode bit position A=Bit number (0-7) | |
| Maths | $F593 | COMPAS | CMPASS | $C8 | Return angle for given delta 'Y:X' | |
| Maths | $F5D9 | COSGET | COSINE | - | Calculate the cosine of 'A' | |
| Maths | $F511 | RAND3 | - | - | Calculate new random number from SEED | |
| Maths | $F517 | RANDOM | - | - | Calculate new random number from SEED | |
| Maths | $F663 | RCOS | LCSINE | $C8 | Multiply 'LEG' by previous cosine value | |
| Maths | $F661 | RCOSA | MCSINE | $C8 | Multiply 'A' by previous cosine value | |
| Maths | $F65D | RSIN | LSINE | $C8 | Multiply 'LEG' by previous sine value | |
| Maths | $F65B | RSINA | MSINE | $C8 | Multiply 'A' by previous sine value WSINE | |
| Maths | $F5EF | SINCOS | - | $C8 | Calculate the sine and cosine of 'ANGLE' | |
| Maths | $F5DB | SINGET | SINE | $C8 | Calculate the sine of 'A' | |
| Misc | $F67F | BAGAUX | BLKMV1 | - | Transfer A+1 bytes (127 max) from source U destination X | |
| Misc | $F545 | CLR256 | - | Clear 256 bytes at address X | ||
| Misc | $F542 | CLRMEM | CLREX | - | Clear executive area of memory ($C800 - $C8FF) | |
| Misc | $F53F | CLRSON | BCLR | - | Clear 'B' bytes from X | |
| Misc | $F55E | DEKR | DECTMR | - | Decrement interval timers (XTMR0 � XTMR5) | |
| Misc | $F55A | DEKR3 | D3TMR | - | Decrement 3 interval timers (XTMR0 � XTMR2) | |
| Misc | $F57A | DEL | - | - | Delay execution for a minimum of 20 cycles (B=Delay) | |
| Misc | $F57D | DEL13 | - | - | Delay execution for 13 cycles | |
| Misc | $F579 | DEL20 | - | - | Delay execution for 20 cycles | |
| Misc | $F575 | DEL28 | - | - | Delay execution for 28 cycles | |
| Misc | $F571 | DEL33 | - | - | Delay execution for 33 cycles | |
| Misc | $F56D | DEL38 | - | - | Delay execution for 38 cycles | |
| Misc | $F1AA | DPIO | - | - | Set 6809 �DP� register for I/O accesses ($D0) | |
| Misc | $F1AF | DPRAM | - | - | Set 6809 �DP� register for RAM accesses ($C8) | |
| Misc | $F552 | FILL | BLKFIL | - | Set a block of memory A=data B=bytes X=dest | |
| Misc | $F8FF | FINDBOX | BXTEST | - | Symmetric collison test | A = Box �Y�
dimension (delta �Y�) B = Box �X� dimension (delta �X�) X = Y:X coordinates of point to be tested Y = Y:X coordinates of box center |
| Misc | $F548 | GILL | CLRBLK | - | Clear D bytes of memory from X | |
| Misc | $F550 | NEGSOM | CLR80 | - | Set B bytes at memory X to $80 | |
| Misc | $F8E5 | OFF1BOX | OFF1BX | - | Off-center symmetric collision test | |
| Misc | $F8F3 | OFF2BOX | OFF2BX | - | Off-center symmetric collision text | |
| Misc | $F683 | STFAUX | BLKMOV | - | Transfer �A� bytes (0-127) from source �U� to destination �X� | |
| Sound | $F92E | AXE | EXPLOD | $C8 | Complex explosion sound effect U=table | |
| Sound | $F9CA | LOUDIN | SETAMP | $C8 | Set amplitude in �REQx� B=Volume | |
| Sound | $F259 | PSG | WRPSG | $D0 | Write to PSG A=PSG Addr B=PSG data X=mirror | |
| Sound | $F284 | PSGLPU | PSGMIR | $D0 | Send sound string to PSG from U and mirror X | |
| Sound | $F27D | PSGLUP | PSGLST | $D0 | Send sound string to PSG from U | |
| Sound | $F256 | PSGX | WRREG | $D0 | Write to PSG and Morror A=Psg Addr B=PSG Data | |
| Sound | $F687 | REPLAY | - | $C8 | Set tune Sequence to list U | |
| Sound | $F289 | REQOUT | - | $D0 | Send 'REQX' to PSG and mirror | |
| Sound | $F690 | SOPLAY | ASPLAY | $C8 | Set tune sequence with alternate note set X=user not table U=Tune List | |
| Sound | $F68D | SPLAY | - | $C8 | Set tune Sequence to list U | |
| Sound | $F742 | XPLAY | - | $C8 | Terminate current tune | |
| Sound | $F692 | YOPLAY | TPLAY | $C8 | Set tune Sequence to list U |
OS Vars
| Address | Name | Details | Notes |
| $C800 | REG0 | Channel A: Fine tone period | |
| $C801 | REG1 | Channel A: Course tone period | |
| $C802 | REG2 | Channel B: Fine tone period | |
| $C803 | REG3 | Channel B: Course tone period | |
| $C804 | REG4 | Channel C: Fine tone period | |
| $C805 | REG5 | Channel C: Course tone period | |
| $C806 | REG6 | Noise period | |
| $C807 | REG7 | Tone / Noise enables | |
| $C808 | REG8 | Channel A: Amplitude | |
| $C809 | REG9 | Channel B: Amplitude | |
| $C80A | REGA | Channel C: Amplitude | |
| $C80B | REGB | Fine envelope period | |
| $C80C | REGC | Course envelope period | |
| $C80D | REGD | Envelope shape / cycle | |
| $C80E | REGE | I/O port data register | |
| $C80F | TRIGGR | Collective Switch Settings | |
| $C811 | EDGE (HEDGES) | Used by button handlers | |
| $C812 | KEY0 | Controller #1 - Switch #0 (Leftmost) | |
| $C813 | KEY1 | Controller #1 - Switch #1 | |
| $C814 | KEY2 | Controller #1 - Switch #2 | |
| $C815 | KEY3 | Controller #1 - Switch #3 (Rightmost) | |
| $C816 | KEY4 | Controller #2 - Switch #0 (Leftmost) | |
| $C817 | KEY5 | Controller #2 - Switch #1 | |
| $C818 | KEY6 | Controller #2 - Switch #2 | |
| $C819 | KEY7 | Controller #2 - Switch #3 (Rightmost) | |
| $C81A | POTRES | Joystick resolution limit | |
| $C81B | POT0 | Joystick #1 - 'X' Axis | |
| $C81C | POT1 | Joystick #1 - 'Y' Axis | |
| $C81D | POT2 | Joystick #2 - 'X' Axis | |
| $C81E | POT3 | Joystick #2 - 'Y' Axis | |
| $C81F | EPOT0 (DPOT0) | Controller #1: Right / left joystick pot enable (must be $00 or $01) | |
| $C820 | EPOT1 (DPOT1 | Controller #1: Up / down joystick pot enable (must be $00 or $03) | |
| $C821 | EPOT2 (DPOT2) | Controller #2: Right / left joystick #2 enable (must be $00 or $05) | |
| $C822 | EPOT3 (DPOT3) | Controller #2: Up / down joystick #2 enable (must be $00 or $07) | |
| $C823 | LIST | Number Of Vectors to be drawn | |
| $C824 | ZSKIP | Flag controlling whether integrators will be zeroed: | Z=no NZ=Yes |
| $C825 - $C826 | FRAME | Frame Counter | |
| $C827 | TENSTY | Contains the last value used for the intensity setting | |
| $C828 | DWELL | Dot �ON� time | |
| $C829 | DASH | Dash pattern for drawing routines | |
| $C82A - $C82B | SIZRAS | Raster Message Size ($HHWW) | $F848=lrg $FC38 = sml |
| $C82C - $C82D | MESAGE | Used by string display functions to hold pointer to message to be displayed. | |
| $C82E | XTMR0 (X0) | ? | |
| $C82F | XTMR1 (X1) | Countdown timer | |
| $C830 | XTMR2 (X2) | Countdown timer | |
| $C831 | XTMR3 (X3) | Countdown timer | |
| $C832 | XTMR4 (X4) | Countdown timer | |
| $C833 | XTMR5 (X5) | Countdown timer | |
| $C834 | ABSY | Working storage for �CMPASS� | |
| $C835 | ABSX | Working storage for �CMPASS� | |
| $C836 | ANGLE | Angle for rotation | |
| $C837 - $C838 | WSINE (SINE) | Location for parameter passing. Generally contains the last sine value calculated | |
| $C839 � C83A | WCSINE (COSINE) | Location for parameter passing. Generally contains the last cosine value calculated. | |
| $C83B | LEG | Executive Working Storage | |
| $C83C | LAG | Used by transformation functions | |
| $C83D - $C83E | FRMTIM (XMSEC) | Frame rate | |
| $C83F | REQ0 | Envelope shape / cycle | |
| $C840 | REQ1 | Course envelope period | |
| $C841 | REQ2 | Fine envelope period | |
| $C842 | REQ3 | Channel C: Amplitude | |
| $C843 | REQ4 | Channel B: Amplitude | |
| $C844 | REQ5 | Channel A: Amplitude | |
| $C845 | REQ6 | Tone / noise enables | |
| $C846 | REQ7 | Noise period | |
| $C847 | REQ8 | Channel C: Course tone period | |
| $C848 | REQ9 | Channel C: Fine tone period | |
| $C849 | REQA | Channel B: Course tone period | |
| $C84A | REQB | Channel B: Fine tone period | |
| $C84B | REQC | Channel A: Course tone period | |
| $C84C | REQD | Channel A: Fine tone period | |
| $C84D - $C84E | DOREMI | Note table pointer | |
| $C84F - $C850 | FADE | Working storage for �SELOPT� and tune player subroutines | |
| $C851 | VIBE | Working storage for tune player subroutines | |
| $C853 - $C854 | TUNE | ? | |
| $C855 | NEWGEN | Working storage for tune player subroutines | |
| $C856 | TSTAT | Working storage for tune player subroutines | |
| $C857 | RESTC | Working storage for tune player subroutines | |
| $C858 | RATEA | Working storage for �EXPLOD� | |
| $C859 | VIBA | Working storage for �EXPLOD� | |
| $C85A | RATEB | Working storage for �EXPLOD� | |
| $C85B | VIBB | Working storage for �EXPLOD� | |
| $C85C | RATEC | Working storage for �EXPLOD� | |
| $C85D | VIBC | Working storage for �EXPLOD� | |
| $C85E | FADEA | Working storage for �SELOPT� and tune player subroutines | |
| $C85F | FADEB | Working storage for �SELOPT� and tune player subroutines | |
| $C860 | FADEC | Working storage for �SELOPT� and tune player subroutines | |
| $C861 - $C862 | TONEA | Working storage for �SELOPT� and tune player subroutines | |
| $C863 - $C864 | TONEB | Working storage for �SELOPT� and tune player subroutines | |
| $C865 - $C866 | TONEC | Working storage for tune player subroutines | |
| $C86A | GAP | Allocated but not used by Mine Storm or Executive | |
| $C86F - $C870 | F1FREQ | Allocated but not used by Mine Store or Executive | |
| $C80F - $C810 | TRIGGR | Current controller button status. | |
| $C867 | SATUS | Working storage for �EXPLOD� | |
| $C868 | LATUS | Allocated but not used by Mine Storm or Executive | |
| $C869 | XATUS | Allocated but not used by Mine Storm or Executive | |
| $C86B - $C86C | B1FREQ | Allocated but not used by Mine Storm or Executive | |
| $C86D - $C86E | B2FREQ | Allocated but not used by Mine Store or Executive | |
| $C871 | FEAST | Allocated but not used by Mine Storm or Executive | |
| $C872 | PEDGE | Allocated but not used by Mine Storm or Executive | |
| $C873 | NEDGE | Allocated but not used by Mine Storm or Executive | |
| $C874 � $C875 | K1FREQ | Allocated but not used by Mine Storm or Executive | |
| $C876 | BACON | Allocated but not used by Mine Storm or Executive | |
| $C877 | XACON | Working storage for �EXPLOD� | |
| $C878 | SPEKT | Allocated but not used by Mine Store or Executive | |
| $C879 | PLAYRS (PLAYRZ) | Number of players ($01 - $09) | |
| $C87A | OPTION (GAMZ) | Number of player options ($01 - $09) | |
| $C87B - $C87C | SEED | Seed used by the random number generator | |
| $C87D � C87F | RANCID | Working storage for random number generators | |
| $C880 | SBTN | First memory location available for use by a game | |
| $C881 | SJOY | Joystick mask (used by MineStorm) | |
| $C883 | ETMP1 | Mine Storm: Temporary working storage | |
| $C884 | ETMP2 | Mine Storm: Temporary working storage | |
| $C885 | ETMP3 | Mine Storm: Temporary working storage | |
| $C886 | ETMP4 | Mine Storm: Temporary working storage | |
| $C887 | ETMP5 | Mine Storm: Temporary working storage | |
| $C888 | ETMP6 | Mine Storm: Temporary working storage | |
| $C889 | ETMP7 | Mine Storm: Temporary working storage | |
| $C88A | ETMP8 | Mine Storm: Temporary working storage | |
| $C88B | ETMP9 | Mine Storm: Temporary working storage | |
| $C88C | ETMP10 | Mine Storm: Temporary working storage | |
| $C88F | TEMP1 | Mine Storm: Temporary working storage | |
| $C890 | TEMP2 | Mine Storm: Temporary working storage | |
| $C891 | TEMP3 | Mine Storm: Temporary working storage | |
| $C892 | TEMP4 | Mine Storm: Temporary working storage | |
| $C893 | TEMP5 | Mine Storm: Temporary working storage | |
| $C894 | TEMP6 | Mine Storm: Temporary working storage | |
| $C895 | TEMP7 | Mine Storm: Temporary working storage | |
| $C896 | TEMP8 | Mine Storm: Temporary working storage | |
| $C897 | TEMP9 | Mine Storm: Temporary working storage | |
| $C898 - $C89A | TEMP10 | Mine Storm: Temporary working storage | |
| $C89B | ACTPLY | Mine Storm: Currently active player ($00 or $02) | |
| $C89C - $C89E | TMR1 | Mine Storm: Timer | |
| $C89F - $C8A1 | TMR2 | Mine Storm: Timer | |
| $C8A2 - $C8A4 | TMR3 | Mine Storm: Timer | |
| $C8A5 - $C8A7 | TMR4 | Mine Storm: Timer | |
| $C8A8 - $C8AE | SCOR1 | Holds player
1�s score... 6 digits $80 terminated ascii |
|
| $C8AF � C8B5 | SCOR2 | Holds player 2�s score | |
| $C8EB - $C8F1 | HISCOR (HEIGH) | Contains ASCII high score |
Hardware Registers
| $D000 | 8-bit port �B� (Control bits) [CNTRL] |
| $D001 | 8-bit port �A� (DAC and PSC data) [DAC] |
| $D002 | Port �B� direction control [DCNTRL] |
| $D003 | Port �A� direction control [DDAC] |
| $D004-7 | Timer #1 [T1LOLC, T1HOC, T1LOL, T1HOL] |
| $D008-9 | Timer #2 [T2LOLC, T2HOC] |
| $D00A | Shift register [SHIFT] |
| $D00B | Auxiliary control register [ACNTRL] |
| $D00C | Peripheral control register [PCNTRL] |
| $D00D | Interrupt flag register [IFLAG] |
| $D00E | Interrupt enable register [IENABL] |
| $D00F | ORA |
The holy trinity - Diffy, Duffy and Packet
The Vectrex has three vector graphics formats!
Diffy lists are a list of connected lines
Duffy lists are an undrawn 'start position' followed by a list of
connected lines.
Packet lists are lists of lines ($FF) and undrawn movements of the pen
($00)
Below is the same graphic drawn in all 3 formats:
| Diffy | Duffy | Packet |
| dc.b 7 ;ItemCount -1 ;dc.b $00,$00 ;No initial move on Diffy dc.b $F6,$F5 ;0 Y,X Draw this dc.b $E6,$0C ;1 Y,X Draw this dc.b $FA,$F6 ;2 Y,X Draw this dc.b $F9,$0A ;3 Y,X Draw this dc.b $06,$08 ;4 Y,X Draw this dc.b $08,$F6 ;5 Y,X Draw this dc.b $17,$0E ;6 Y,X Draw this dc.b $0E,$F2 ;7 Y,X Draw this |
dc.b 8 ;ItemCount -1 dc.b $00,$00 ;0 Y,X Move to this point dc.b $F6,$F5 ;1 Y,X Draw this dc.b $E6,$0C ;2 Y,X Draw this dc.b $FA,$F6 ;3 Y,X Draw this dc.b $F9,$0A ;4 Y,X Draw this dc.b $06,$08 ;5 Y,X Draw this dc.b $08,$F6 ;6 Y,X Draw this dc.b $17,$0E ;7 Y,X Draw this dc.b $0E,$F2 ;8 Y,X Draw this |
dc.b $00,$00,$00 ;0 Y,X Move
to this point dc.b $FF,$F6,$F5 ;1 Y,X Draw this dc.b $FF,$E6,$0C ;2 Y,X Draw this dc.b $FF,$FA,$F6 ;3 Y,X Draw this dc.b $FF,$F9,$0A ;4 Y,X Draw this dc.b $FF,$06,$08 ;5 Y,X Draw this dc.b $FF,$08,$F6 ;6 Y,X Draw this dc.b $FF,$17,$0E ;7 Y,X Draw this dc.b $FF,$0E,$F2 ;8 Y,X Draw this dc.B $01 ;End of list |
Character Map
| The Vectrex has some character printing routines - they have a built in character map, which has upper case and a few system characters. |  |
Direct Page
| The Vectrex uses two Direct page settings $C8 points to RAM $D0 points to Hardware registers With ASW (Our assembler) use ASSUME dpr:$xx to tell the assembler where the direct page is... this is called SETDP on some assemblers. |
AY Registers
| The procedure for setting and reading AY registers is not quite direct... the method is shown here | Select Register: RegNum -> $D001 #$19 -> $D000 #$01 -> $D000 |
Write Selected Register: New Value -> $D001 #$11 -> $D000 #$01 -> $D000 |