SpectNetIDE implements Every officially documented Z80 instruction as well as the non-official ones. During the implementation I used ClrHome.org as a reference.
Z80 instructions may start with a label. Labels are identifiers that can be terminated by an
optional colon (:
). Both labels in these samples are accepted by the compiler:
Start: ld b,#f0
Wait djnz Wait
Z80 Mnemonics
The compiler accepts these mnemonics:
ADC
, ADD
, AND
, BIT
, CALL
, CCF
, CP
, CPD
,
CPDR
, CPI
, CPIR
, CPL
, DAA
, DEC
, DI
, DJNZ
,
EI
, EX
, EXX
, HALT
, IM
, IN
, INC
, IND
,
INDR
, INI
, INIR
, JP
, JR
, LD
, LDD
, LDDR
, LDDRX
*, LDDX
*,
LDI
, LDIR
, LDIRSCALE
*, LDIRX
*, LDIX
*, LDPIRX
*, MIRROR
*, MUL
*, NEG
,
NEXTREG
*, NOP
, OR
, OTDR
, OTIR
, OUT
, OUTINB
*,
OUTD
, OUTI
, PIXELAD
*, PIXELDN
*, POP
, PUSH
, RES
, RET
, RETI
, RETN
,
RL
, RLA
, RLC
, RLCA
, RLD
, RR
, RRA
, RRC
,
RRCA
, RRD
, RST
, SBC
, SCF
, SET
, SETAE
*, SLA
, SLL
SRA
, SRL
, SUB
, SWAPNIB
*, TEST
*, XOR
.
The instructions marked with * can be used only with the ZX Spectrum Next model.
Z80 Registers
The compiler uses the standard 8-bit and 16-bit register names, as specified in the official Zilog Z80 documentation:
- 8-bit registers:
A
,B
,C
,D
,E
,H
,L
,I
,R
- 16-bit registers:
AF
,BC
,DE
,HL
,SP
,IX
,IY
- For the 8-bit halves of the
IX
andIY
index registers, the compiler uses these names:XL
,XH
,YL
,YH
. Alternatively, the compiler accepts these names, too:IXL
,IXH
,IYL
,IYH
. As a kind of exception to general naming conventions, these mixed-case names are also accepted:IXl
,IXh
,IYl
,IYh
.
JP Syntax
Z80 assemblers use two different syntax for the indirect JP
statements:
; Notation #1
jp hl
jp ix
jp iy
; Notation #2
jp (hl)
jp (ix)
jp (iy)
The SpectNetIDE compiler accepts both notation.
ALU operations syntax
Three standard ALU operations between A
and other operands (ADD
, ADC
, and SBC
) sign A
as their first operand:
add a,b
adc a,(hl)
sbc a,e
Hovewer, the five other standard ALU operations between A
and other operands (SUB
, AND
, XOR
,
OR
, and CP
) omit A
from their notation:
sub e
and (hl)
xor e
or c
cp b
The SpectNetIDE compiler accepts the second group of ALU operations with using the explicit
A
operand, too:
sub a,e
and a,(hl)
xor a,e
or a,c
cp a,b