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ZERO Emulator - BugsI have been using Zero emulator to experiment a few routines in assembly, since it has a somewhat usable debugger. However I believe I found a few b…
...
That's the correct Z80 behaviour, DEC BC and all ... 't affect [b]any[/b] flags.
[quote]
... "condition" is a 16 bit register, like BC for example ... t a 'real' 16-bit register, its two seperate 8 ... is split in two 8 bit registers or not.
... -
ZERO Emulator - BugsI have been using Zero emulator to experiment a few routines in assembly, since it has a somewhat usable debugger. However I believe I found a few b…
... /> That's the correct Z80 behaviour, DEC BC and all ... t affect [b]any[/b] flags.
[/quote]
... 16 bit INC or DEC, do not change flags.
bit increments are documented.
Z80 Manual, just to ... -
ZERO Emulator - BugsI have been using Zero emulator to experiment a few routines in assembly, since it has a somewhat usable debugger. However I believe I found a few b…
... officially undocumented, since only 8 bit increments are documented.
... it is documented :) The 8-bit uP instruction sets benefitted from ... the 16-bit inc/dec instructions don't affect the flags is ... You're dancing around a z80 idiom here... when you're ... -
(Collected) Darkhog's noob question about z80 assemblySince when I'm learning new language or library, I tend to ask lots of stupid (for any advanced person) questions and I don't want it to have mess up…
[quote="Darkhog;52514"]
- Regular IF z80 equivalent. e.g. If A -
Graphics program in AssemblyHi so I think I'm getting the hang of this so I've done this program. It writes directly to the screen. I'm using ZX Spin. [code] LD HL,16384 LD B,…
... the 16-bit INC/DEC don't affect the flags might have ... -bit circuit just a consequence. The fact they don't affect flags ... coincidence. Keep in mind the z80/8080 ISA wasn't invented ... -
Copying a single character from one place to another?[code] ORG 33000 LD A,8 LD HL,16384 LD BC,256 LD DE, 18432 LOOP: PUSH AF LD A,(HL) LD (DE),A ADD HL, BC POP AF DEC A JR NZ,LOOP REST […
... ’s (some) operations on 16-bit register pairs that don’t ... doesn’t apply to 8-bit registers in this case. So ... /> I recommend you study a Z80 instruction reference and/or use ... effect each instruction has on flags. It’s highly educational and ... -
What is the best book to start AssemblyI want to start to learn Assembly
... would also recommend spending a bit of time loading some games ... instruction affects memory and the flags. Try and work out what ... neat tips on the way z80 is used. (For instance using ... -
how do i change the color of the input statement "" and whatever is typed in it?the background ink doesnt seem to change it
... you'll need a small z80 asm routine. Have a look ... of the screen via bit 0 of TV-FLAGS system variable. If ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... equ 23560 ; sysvars
flags equ 23611 ; bit 5 = key not pressed ...
output:
SjASMPlus Z80 Cross-Assembler v1.18.2 ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... .
Reference:
http://z80-heaven.wikidot.com/optimization
bit register, not just A. You ... cannot check for a 16 bit register being 1 or #FFFF ... DEC on a 16 bit register pair does not set ANY flags. -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... ld a, 128 ; set bit 7 in A
; ... ld a, (hl)
bit 0, a ; are we pressing ... 1 ; mask out caps shift bit
ret z ; return ... jr nz, .getkeyval
bit 1, a ; are we pressing ... 2 ; mask out symbol shift bit
jr z, .onlysymshiftpressed ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... ld a, 128 ; set bit 7 in A
; ... ld a, (hl)
bit 0, a ; are we pressing ... 1 ; mask out caps shift bit
ret z ; return ... jr nz, .getkeyval
bit 1, a ; are we pressing ... 2 ; mask out symbol shift bit
jr z, .onlysymshiftpressed ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... ~2 ; mask out symbol shift bit
jr z, .onlysymshiftpressed< ... /> ; code borrowed from here http://z80-heaven.wikidot.com/math#toc32 ... (DE)
signedhltodecimal:
bit 7, h
jr z ... /> and ~#80 ; mask out evaltime bit
inc a ; DE + ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... ld a, 128 ; set bit 7 in A
; ... ld a, (hl)
bit 0, a ; are we pressing ... 1 ; mask out caps shift bit
ret z ; return ... jr nz, .getkeyval
bit 1, a ; are we pressing ... 2 ; mask out symbol shift bit
jr z, .onlysymshiftpressed ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... 's going to be a bit fiddly).
... ld a, (hl)
bit 0, a ; are we pressing ... ; mask out caps shift bit
ret z ; return ... jr nz, .getkeyval
bit 1, a ; are we pressing ... 2 ; mask out symbol shift bit
jr z, .onlysymshiftpressed ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... ~2 ; mask out symbol shift bit
jr z, .onlysymshiftpressed< ... ; code borrowed from here http://z80-heaven.wikidot.com/math#toc32 ... ; none of these operations affect flags
ld (hl), c
bit
inc a ; DE + ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... ~2 ; mask out symbol shift bit
jr z, .onlysymshiftpressed< ... ; code borrowed from here http://z80-heaven.wikidot.com/math#toc32 ... ; none of these operations affect flags
ld (hl), c
bit
inc a ; DE + ... -
SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
... If an instruction modifies the flags, the immediately following SCF ... explicitly clear - by modifying flags I mean updating the ... instructions that set flags (any or flags 3 and 5 specifically ... playing a bit with symbolic simulation of the Z80 transistor net ... -
Z80/SNA Compiler under Windows???Does anybody know anything about Z80/SNA compiler under Windows???
Does anybody know anything about Z80/SNA compiler under Windows??? -
Help with my first emulatorActually, when I say 'first' that's a bit of a lie - I used to own a mac and had Macspectacle which was dandy. Now, however I have a PC running Windo…
... say 'first' that's a bit of a lie - I used ... use. I downloaded Z80 and that was a bit pants - very flickery ... -
Calling all coding munkeez...Having spent the last 8 years as a Windows application developer I thought I'd try my hand at a bit of Z80 speccy coding - something I missed out on …
... try my hand at a bit of Z80 speccy coding - something I ... - will my experience help with Z80? What's the best assembler ... -
Z80 to DSK?Does anyone know if there is a prog that can convert z80,tzx or tap files to dsk format? I have access to a friends pc that has a 3 inch drive which …
... a prog that can convert z80,tzx or tap files to ... looked at a program called z80 snapshot loader at
[url ... -
Z80/SNA compiler under Windows???Does anybody know anything about Z80/SNA compiler under Windows???
Does anybody know anything about Z80/SNA compiler under Windows??? -
Visible-Z80 - VISZ80 - by Miklos Patrubany Hi All ! Visible-Z80 - VISZ80 - by Miklos Patrubany Does anyone have this program ? Please help me. I want to learn Z80 and Assambler on Z8…
Hi All !
Visible-Z80 - VISZ80 - by Miklos Patrubany
< ... want to learn Z80 and Assambler on Z80 and I have a ... -
Forever 2002 - crossplattform 8 bit party - the 3rd editionThe new year - a year of anniversaries for all 3 major 8 bit plattforms has started. ZX spectrum & C64 are 20 years old & Atari is celebrating 30 ani…
... for all 3 major 8 bit
plattforms has started. ZX ... edition of the Forever 8-bit party held on 15.-17 ... -
Assembler code from tutorial, problem!I was wondering if anyone could help me decipher this z80 assembler code? ORG 60000 LOAD 60000 EA60 21BCEA LD …
... could help me decipher this z80 assembler code?
ORG ... LD A,80H ;set top bit in A
EA65 86 ... -
Converting TAP to Z80Is there an EXE out there that will convert *.TAP into any other snapshot (preverably Z80 or SNA) Please Help Oatesy
Is there an EXE out there that will convert *.TAP into any other snapshot (preverably Z80 or SNA)
Please Help
Oatesy -
Speccy Ringtones for your mobile :)Hi guys Im sure i cant be the first person to think of this, but with the aid of a few software packages, I spent this weekend converting some class…
... free sound. eg Gerton Lunters Z80.
2 Let your favourite ... /> er, obviously this requires a bit of time and patience, but ... -
SNA 2 Z80Hi Is there a difference between an sna file and a z80 file.Is it possible to rename the sna extension to z80 or do I need a conversion utility.
Hi
Is there a difference between an sna file and a z80 file.Is it possible to rename the sna extension to z80 or do I need a conversion utility.
