Learn Multi platform eZ80 Assembly Programming... For more power!


Introduction

The eZ80 is an enhanced version of the Z80... still technically an 8 bit processor, it has a 24 bit address bus and extends the previously 16 bit registers to 24 bit - this allows addressing up to 16mb memory.

There is a new 'ADL MEMORY mode' which works in full 24 bit addressing.... 'Z80 Memory Mode' emulates a classic Z80.

As the eZ80 is an extension of the Z80, This tutorial assumes you understand the basics of the Z80... if you do not, you need to start here.


If you want to learn eZ80 get the Cheatsheet! it has all the Z80 commands, and new enhanced commands the eZ80 adds to the cpu



ChibiAkumas eZ80 tutorials

Z80 Hello World Series

Lesson H1- Hello World on the TI-84

Z80 Platform Specific Lessons

Lesson P1 - Bitmap Hello World and sprite drawing on the Ti-84 in 16bpp [T84]
Lesson P2 - Bitmap Hello World and sprite drawing on the Ti-84 in 16 colors (4bpp) [TI8]


The new features of the eZ80

The Z80 is an 8 bit processor,  usually around 4 MHz, but 6mhz versions exist.
The MSX Turbo-R R800 is also 100% Z80 compatible, with 4x the effective speed.

Each Register can only store one byte (0-255), but some registers can be used in certain cases together as 16 bit pairs. For example HL together are 16 bits, and can store 0-65535.

Each of the registers has a 'purpose' it is intended for., but you can use any register for anything you want!
The different registers all have 'strengths' because many commands will only work with certain ones, and some commands may be slower or need more code if you use the wrong one.

The Z80�s large number of registers makes z80 programming very different to a system like the 6502.

The Z80 uses a 16 bit address bus. This means it can address $0000-$FFFF (0-65535) giving a total of 64k. Systems like the 128K Amstrad 6128 get around this limitation via bank switching.
In addition to the addressable memory, the Z80 also addresses hardware ports via OUT and IN.

On some systems like the MSX, ports are 8 bit. These use register C as the port number in commands like "OUT (C),A" but on on other systems like the CPC or Spectrum it�s 16 bit, using BC. Annoyingly the command is still the rather misleading "OUT (C),A"!
You may wonder why some use 8 bit ports, and some use 16 bit ones, The difference is not the Z80 itself, but how the Z80 is wired up in the computer.

On the Z80 when commands have two parameters: The parameter on the right is the source, the parameter on the left is the destination.
For example: "ADD HL,DE" will add the source DE to the destination HL.
Finally it should be noted the eZ80 is a more enhanced Z80 with a 24 bit address bus, which is also backwards compatible with the Z80.

The eZ80 Registers
The eZ80 registers are an extension of the classic Z80, and it's main registers have been upgraded to 24 bits.

The eZ80 has had all it's registers pairs extended - an 'upper' byte (HLU/BCU/DEU) has been added... this can not be used on it's own - just when HL/BC/DE is loaded in entirety by a command like "LD HL,$123456"

There are two stack pointers - one for ADL mode (eZ80) and one for legacy mode (Z80 compatibility)... in Z80 legacy mode MB (MBase) acts as the top byte of 24 bit addresses. so if MB=$EF then "Call $1234" would effectively call to $EF1234

MBase can only be altered from eZ80 mode.

Main Registers:
 
Register group
8 Bit Upper 8 Bit High  8 Bit Low Use cases
A Reg  x
x A Accumulator
F Reg  x
x F Flags
BC Reg BCU B C Byte Count
DE Reg DEU D E Destination
HL Reg HLU H L Source / 24 bit accumulator
IX Index Reg IXU IXH IXL Base+Offset
IY Index Reg IYU IYH IYL Base+Offset
Stack  Pointer Long (24 bit) SPL Stack in eZ80 mode
Stack Pointer Short (8/16 bit) MB SPS Stack in z80 mode
MB / MBase x x MB Top byte of addresses in z80 mode
Refresh x x R Used by Ram
Interrupt Vector I IM2 Byte Used in Interrupt Mode 2
Program Counter PC Current running code
    Flags: SZ-H-PNC

Name Meaning
S Sign Positive / Negative
-

Z Zero Zero Flag (0=zero)
-

H Half Carry Used by DAA
-

P / V Parity / Overflow Used if a sign changes because a register is too small
N Add / Subtract Used by DAA
C Carry Carry / Borrow



CPU Modes
Mode ADL MADL MBASE MMU
Native Z80 0 0 0 off
Virtual Z80 0 0 !=0 off
Native Z180 0 0 0 on
Virtual Z180 0 0 !=0 on
ADL Mode 1
doesn't matter doesn't matter


Memory mapped registers
The MMU functionality is enabled and configured by 3 memory mapped registers
Address
Purpose
Details
$000038 CBR - Common Bank Register Used by 80180 compatibility mode (Z180)
$000039 BBR - Base Bank Register Used by 80180 compatibility mode (Z180)
$00003A CBAR - Common Bank Area Register Used by 80180 compatibility mode (Z180)

Extensions

Whether we're in 'Short' Z80 (ADL=0) or 'Long' eZ80 (ADL=1) mode, there may be times we need a single command to work in the other mode.

We can do this with suffixes to the command... these contain two parts... the first part is the CPU mode (S or L for Short or Long)... the second part is the Parameter mode (IS or IL for Short or Long)

We can specify both parts, or just one... for example we can specify the complete "LD.LIL", or the shorter "LD.L" or "LD.IL"... when the full size isn't specified, the missing part will be 'filled in' based on the current mode. (L / IL for eZ80 ADL=1  ...  S / IS for Z80 ADL=0)

LD.XiY
X = CPU mode (S / L) (CPU Data block)
Y = Parameter length (IS / IL) (CPU Control Block)

BC=$123456, HL=$ABCDEF, MB=$89


CPU
Mode
Parameter
Mode
Command Result
SIS Short
(Z80)
Short
(16 bit)
LD.SIS HL,$A2A3
LD.SIS (HL),BC
LD.SIS (HL),$B2B3
HL = $??A2A3 (U=$00 in ADL mode - Unknown in z80 mode)
$89CDEF = $3456
($89CDEF) = $B2B3
SIL Short
(Z80)
Long
(24 bit)
LD.SIL HL,$A1A2A3
LD.SIL (HL),BC
LD.SIL (HL),$B1B2B3
HL = $??A2A3 (U=$00 in ADL mode - Unknown in z80 mode)
$89CDEF = $3456
($89CDEF) = $B2B3
LIS Long
(eZ80)
Short
(16 bit)
LD.LIS HL,$A2A3
LD.LIS (HL),BC
LD.LIS (HL),$B2B3
HL = $??A2A3 (U=$00 in ADL mode - Unknown in z80 mode)
$ABCDEF = $123456 (S had no effect)
($ABCDEF) = $00B2B3
LIL Long
(eZ80)
Long
(24 bit)
LD.LIL HL,$A1A2A3
LD.LIL (HL),BC
LD.LIL (HL),$B1B2B3
HL=$A1A2A3
$ABCDEF = $123456
($ABCDEF) = $B1B2B3


Lesson 1 - 24 Bit ADL mode, and new commands
On the TI-84 we'll usually want to work in 24 bit mode "ADL" mode.

In this lesson we'll learn how ADL changes the existing commands, and what commands have been added over the classic Z80.



The eZ80 has two modes...
Classic Z80 mode where ADL=0... in this mode register pairs like HL are 16 bit.

eZ80 mode (ADL Mode) is the new mode where ADL=1.. in this mode register triples like HL are 24 bit.

Load Commands
When eZ80 mode (ADL mode) is enabled, the previously 16 bit load commands will work in 24 bits.

Being 8 bit, the function of the 8 bit accumulator is unchanged.

Here we've loaded a 24 bit value into HL and IX...

IY is also 24 bit, but of course we can specify a 16 bit value if we prefer.
Here we loaded the 8 bit accumulator with 128 ($80)

We loaded the 24 bit HL, IX and IY... Though we only specified a 16 bit value for IY.

Maths Commands
All previously 16 bit commands are now 24 bit.

Here we've added 24 bit DE to 24 bit HL with "ADD HL,DE"

This command now works in 24 bit, as does "SBC HL,DE" and "DEC HL"

8 bit commands are still 8 bit, so "INC H" has the same effect as before.
Here you can see the first three 24 bit commands affected all the bytes in HL

The last "INC H" only altered the H byte of the HL H L triple, making it roll round to 1
In eZ80 ADL mode, The Push and Pop commands will push and pop commands will transfer 3 bytes per command. We use it here to back up and restore HL

Even PUSH/POP AF will push a third unused byte.


There is typically no way to work with the 8 bit top "HLU" byte of the 24 bit HL, but if we need to, we can push it onto the stack and read it from there.
The stack pointer changed by 3 bytes. We were able to back up and restore HL.

We also pushed HL onto the stack, then read HLU off the stack into A

Loading from, and writing to ram
Loading from memory addresses has received an upgrade!

Loading to the accumulator works the same as before,

But we can now load a 24 bit triple in a single command! (this will work in 16 bit in ADL=0 mode)

This does not affect the loading of an 8 bit part like E, D etc... there's still no way to load the upper byte :-(

These new commands even work with (IX+n) addressing!
A and E were loaded from HL... as were the three bytes in BC...

We then loaded HL from IX+4
These commands work for storing to memory too!

We can store the Accumulator, a 24 bit triple, or an 8 bit part.
We stored 8 bit A, 24 bit BC and 8 bit D to memory.

Multiply Sleep and Test
Z80 users rejoice! The eZ80 adds an 8 bit multiply command to the Z80!

It's usage is simple, we use a register pair, for example HL, the result will be HL=H*L... it also works on BC, DE and (Strangely) SP!

Note: the MLT command is always 16 bit, even in ADL mode.

As an added bonus, lets look at SLP... this puts the CPU permanently to sleep, it's intended for power saving (the internal clock still works)

The multiplications were performed, then SLP locked up the CPU!

We now have a TST command... this takes an 8 bit register, and sets the flags like an AND command. the registers are unchanged

This command compares to the accumulator... We cannot do "TST B,C"

Here we compared A and C... resulting in the Z flag being cleared


Loading and Pushing Effective Addresses
Using Index registers IX and IY with an offset is handy, but it can be slow, and takes extra memory

The eZ80 gives us two new commands to work with 'Effective addresses'.

LEA will load the 'Effective address' (The result of the index register plus offset) in a 24 bit register (HL,BC or DE)

PEA will push the effective address onto the stack, where it can be used later.
BC was loaded with IX+7... DE was loaded with IX-1

IX+6 was pushed onto the stack... then popped into HL


Strange new registers!
The eZ80 has a variety of strange and upgraded registers.

First is the I register - it's only used in Interrupt Mode 2 - it was 8 bit, but is now 16  bit, and is loaded via HL.

in Classic Z80, ADL=0 mode we're only using 16 bit addresses, the 'top byte' of the actual physical 24 bit address is defined by a register known as MB (MBase)

We can only set this in eZ80 ADL mode, and need to make sure it's correct for when we use z80 mode.

Finally is the 'Mixed mode flag'... if we're combining eZ80 (ADL=1) and classic Z80 (ADL=0) code we need to set this with STMIX... if we are only using eZ80 code, we should use RSMIX... this alters how interrupts are handled by the processor
We loaded HL from I... then loaded I from HL

next we loaded A from MB... then loaded MB from A

We also messed with STMIX/RSMIX... but there's no way to read from that flag!


Lesson 2 - Switching between 16 bit Z80 and 24 bit eZ80 (ADL)
Ideally we'd work in 24 bit ADL mode all the time - it's certainly easier.
Unfortunately we do need to cover the complex issue of mixed modes...

Brace yourself - it's going to get nasty!



Switching Between Z80 and eZ80

We're going to use tons of command extensions to switch between Z80 and eZ80 mode on a per command basis!

If you need to see more details... you need to read this section here

There are two stacks on the eZ80... the Z80 'Short stack' SPS and the ADL eZ80 'Long stack' SPL

When we switch between modes, these may both be used.

We're going to do some tests of jumping to Z80 (Short) code and eZ80/ADL (Long) mode

First we need to do some set up to make things work right, we need to set up MB (MBase - the top byte of the Z80 mode program counter)

We also load IX and IY with the stack addresses - this is for our stack display code
We can call a Z80 subroutine with "CALL.IS"

This will switch to non ADL classic Z80 mode
We need to tell the assembler to start compiling classic Z80 mode, on WLA we use ".ASSUME ADL=0"

Typically all commands will be 8 bit, but we can override these to force a command

If we want to call an eZ80 ADL subroutine, we need to use a long call with "CALL.IL"

Because we specified a calll with a mode switch We need to use a special return "RET.L" - this is the return we use whether returning to Long Z80 ADL code, or Short classic Z80 code
When we call an 8 bit subroutine the 24 bit return address is split into two parts... the low 16 bit is pushed onto the SPS stack... the top 8 bits is pushed onto the SPL stack

When we call from eZ80 / ADL mode, a mode byte 03h byte will be pushed onto the SPL stack... this will tell the future RET.L command what state to return the processor to
We can call a Long subroutine from Z80 code with "CALL.IL"

This will switch to eZ80 / ADL mode... it will still need to include "RET.L" at the end.
We need to tell the assembler to compile eZ80 ADL code again.

We also need to use RET.L to read the byte off the stack when we return
When calling eZ80 / ADL code from classic Z80 code, the 16 bit return address is pushed onto the SPL stack.

a mode byte 02h byte will be pushed onto the SPL stack... this will tell the future RET.L command what state to return the processor to
We can also use Jump commands to switch between Short Z80 and Long ADL/eZ80 mode.

We can use these commands irrespective of the starting mode... We can use CALL.IL from either Z80 or eZ80 mode... the only important thing is that we use RET.L to return.

As RET.L uses the 'Extra' mode byte on the stack, we cannot use it with a regular CALL

The many effects of CALLs
The call command will have differing effects on the stacks depending on the mode before and after the call... here is a summary of the affect on the two stacks.

Cpu
Mode
 Before 

Cpu
   Mode 
After

Suffix

SPS (16 bit)

SPL (24 bit)

New PC

S

S

none

PC.L, PC.H


MBASE, Addr.H, Addr.L

L

L

none


PC.L, PC.H, PC.U

Addr.U, Addr.H, Addr.L

S

S

.IS

PC.L, PC.H

02h

MBASE, Addr.H, Addr.L

L

S

.IS

PC.L, PC.H

03h, PC.U

MBASE, Addr.H, Addr.L

S

L

.IL


02h, PC.L, PC.H

Addr.U, Addr.H, Addr.L

L

L

.IL


03h, PC.L, PC.H, PC.U

Addr.U, Addr.H, Addr.L



Switching modes for a single command (full specification)
We're in Short Z80 Mode There are 4 possible options if we can specify:

SIS, SIL, LIS and LIL

Here are the 4 options applied to an LD rr,(IX) command
Here are the results

In this case SIS & SIL and LIS & LIL have the same function
This time we'll use SIS, SIL, LIS and LIL with the LD (IX),rr command
Here are the 4 options applied to an LD rr,(IX) command

In this case SIS & SIL and LIS & LIL have the same function
Here are the results
Because we specified the full specification, it doesn't matter if our commands are run in eZ80 ADL mode, or Z80 mode, the result will be the same,

Here's the result in Long eZ80 ADL mode.

Rather than specify the full extension, we can specify half, and the rest will be 'filled in' based on the current mode.

Lets see all the options...

Switching modes for a single command (.IS and .IL)
This time we're only specifying the .IS and .IL part... This means the remainder will be filled in by the current mode.

If we're in Short Z80 mode .IL or .IS will effectively perform .SIL  or .SIS
In this case, all the loads were effectively 8 Bit
Here are the save commands.
Once again the commands were all effectively 8 Bit
This time we'll try the commands in Long eZ80 ADL... .IL or .IS will effectively perform .LIL  or .LIS
in this case all the commands effectively worked in Long mode.
This time we'll do the save comands in long mode.
Once again, all the commands effectively worked in Long mode.


Switching modes for a single command (.S and .L)

This time we're only specifying the .IS and .IL part... This means the remainder will be filled in by the current mode.

If we're in Short Z80 mode .S or .L will effectively perform .SIS  or .LIS
The .S version has loaded an 8 bit value,
The .L version  has loaded a 16 bit value.
This time we'll use the store command in Short mode.
The .S version has saved an 8 bit value
The .L version  has saved a 16 bit value.
This time we'll try the commands in Long eZ80 ADL... .L or .S will effectively perform .LIL  or .SIL
Once again, the .S commands have transferred short values, and the .L commands have transferred Long values.
Lets try again with a write command.
Once again
The .S version has saved an 8 bit value
The .L version  has saved a 16 bit value.

In most cases the suffix hasn't made a difference between IS and IL suffixes, but it depends on the MBASE, and the command.

To be honest though, it's really best to avoid the issue all together, and avoid using suffixes, and in the rare case you need them specify the full .LIL .SIS etc rather than the partial specification.

Lesson 3 - OUTS and INS on the eZ80
Some Z80 systems had 16 bit ports (using BC) but others used only 8 bit ones, (using C)

The eZ80 standardizes on 16 bit ports, and even adds commands for on chip I/O (where the top byte of the 16 bit port is $00xx

Lets take a look!


DO NOT RUN THESE ON REAL HARDWARE! - these examples are intended for emulator use only!
OUTing to your hardware could cause problems, hardware damage, and
your screen to explode causing shards of glass to poke out your eyes!
Don't say I didn't warn you!

The TI-84 causes a NMI to ROM functions whenever an OUT occurs - which rather ruins our plans to play with ports!

However, there's a work around, we can switch to 8 bit mode and write our own dummy NMI handler to play with ports... lets have a go!

New Port Commands

In addition to all the previous commands, the eZ80 adds some strange new commands!

Some use (DE) as the port, with BC as a 16 bit loop counter.

IN
Out
Port
Src/Dest
Actions After
Repeat Until
IN0 r,#
OUT0 (#),r
$00## r

IND2
OUTD2
$BBCC (HL) DEC HL, DEC C, DEC B
IND2R
OTD2R $DDEE (HL) DEC HL, DEC DE, DEC BC BC=0
INDM
OTDM
$00CC (HL) DEC HL, DEC C, DEC B
INDMR 
OTDMR $00CC (HL) DEC HL, DEC C, DEC B B=0
INDRX
OTDRX
$DDEE (HL) DEC HL, DEC BC BC=0
INI2
OUTI2 $BBCC (HL) INC HL, INC C, DEC B
INI2R OTI2R
$DDEE (HL) INC HL, INC DE, DEC BC BC=0
INIM
OTIM
$00CC (HL) INC HL, INC C, DEC B
INIRX
OTIRX
$DDEE (HL) INC HL,DEC BC BC=0

We'll only be trying a few port commands in this episode, The TI-84 doesn't offer many devices we can access, and some of these commands do strange things (like reading from port BC, and DECrementing B and C separately)

Making the TI-84 behave!
The TI-84 causes a NMI interrupt every time we send data to a port, which we can't stop in eZ80 ADL mode, as we can't change the interrupt handler at &0066

We can however switch to Short mode, in which all the 64k accessible memory is ram, and write our own dummy interrupt handler (Just a RETI command) 

Here's a simple test program, which will dim the backlight via port &B024.
Our program has made the screen dim, it then returns to the OS, though the screen stays dim!


OUT0 - Writing to port &00xx
OUT0 is a new command, it uses 16 bit port &00CC - where CC is the C register.

This can be used to access the internal IO of the eZ80. Here we use it to read and change the speed of the CPU

INI2R and IND2R - for 16 bit ranges
Like the old INIR and OTIR commands, we now have new commands that use a 16 bit port (DE) , a 16/24 bit address (HL) and a 16 bit counter (BC).

Here we're using these commands to scan the keyboard range (Ports $A000-$A040) and transfer these to memory
When we press a key we will see the data represented in the range.


INDRX and INIRX - repeatedly read from one address.
There will be times we need to read a lot of data to or from memory from a single port.

Here we're reading a sequence of data in from port $6001, and writing them to memory.

INIRX will read BC bytes from port DE to address HL onwards
We're reading lots of data here, we'll see it change as the counter does.


INIMR - Read from consecutive ports in the $00xx range

if we want to transfer a range of bytes from a range of ports where the top byte is &00xx we wan use INIMR

This will transfer B bytes from port $00CC onwards to address HL onwards

here we've transferred 16 bytes from port $0000-$0015 to address $1000+
We've loaded 16 bytes from the first 16 ports.






 

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on Amazon in Print or Kindle!


Buy my Assembly programming book



Available worldwide!
Search 'ChibiAkumas' on
your local Amazon website!
Click here for more info!



































































































Buy my Assembly programming book
on Amazon in Print or Kindle!


Buy my Assembly programming book



Available worldwide!
Search 'ChibiAkumas' on
your local Amazon website!
Click here for more info!