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40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... /> ;; ------------------------------------------------------
_con_putcharxy::
pop hl ; get return address
call pch_to_screen
pop bc
ret
... row address
;; affects: flags, a, hl
vid_nextrow ... -
Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... point
push af ; save flags
di ; disable interrupts
pop af ; get back flags
ret po ; po ... -
Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... point
push af ; save flags
di ; disable interrupts
pop af ; get back flags
ret po ; po ... -
(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…
Both wat and wut are enclosed by push af/pop af. So flags are preserved. Anyway, if you know of a better way to do it, then I can't wait to see it! -
(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;857498"]Both wat and wut are enclosed by push af/pop af. So flags are preserved. Anyway, if you know of a better way to do it, then I can't wait to see it![/quote]
It would be easier to optimise if we saw a bit more of the code. -
(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…
... call z,isexactly4
pop af
push af
pop af
call nc,morethan4 ... /> ..
..[/code]
The "pop af, push af" sequence doesn ... but restores AF so flags are the same as before ... -
(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…
... pass information back using the flags. (for example in your program ... 's quicker than continual push/pop combos (which also prevent you ... -
Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…
... Z ; Test bit 7 of FLAGS: syntax/run = syntax (ROM ... syntax.(ROM)
0x5BC3 POP BC ; Drop the addresses ... current stack end
0x5BE4 POP DE ; Restore operand
... the return address
0x5BEF POP BC ; Restore BC
... -
Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…
... consider weird program flows like POP AF; JP Z, somewhere; PUSH ... , reads from B, and sets flags. You know that LD IX ... -
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,…
... been designed to affect the flags, then so would every instruction ... a 16-bit number: PUSH, POP, CALL, RET, RST, RETI,INDR ... -
The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…
... :
push af ; store a, flags
push hl ; and hl ... to buggy core.
(1) pop hl ; else called from ROM ... regs and return
(1) pop af
(1) ret
- push all regs/pop all regs (if received command ... -
what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... br /> call charaddress
pop bc
pop af[/code]
It is better to push/pop inside function.
1) if ... back result (consider results in flags for example) unless you start ... function that does the push/pop of registers that matter when ... -
what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... br /> call charaddress
pop bc
pop af[/code]
It is better to push/pop inside function.
1) if ... back result (consider results in flags for example) unless you start ... function that does the push/pop of registers that matter when ... -
Possible type ins?Just looking through some of these old (original) copied tapes and theres some which if i remember right were type ins? maybe from the basic manual o…
... was a Meteor game in Pop.Com.Weekly (Nov'83, week ... User (Apr'85), and a Flags of the World in Home ... /> Labyrinth (Dave Middleton, ZX81) in Pop.Com.Weekly
Labyrinth (Ian ... Hunter, ZX81) in Pop.Com.Weekly
Labyrinth (Steve ... -
I am currently watching.....This stems from a rant Mel did months ago on the currently listening to thread, and he suggested starting a thread like this to somebody (sorry can't…
... address for a rather sketchy pop-up, and virus ridden anime ... several other sketchy virus, and pop-up ridden gaming, and music ... any red flags from my virus checkers, and all pop-ups and ... -
Things that people >= 40 (ish) would recognize (and others would likely not)#1: Used to see these all over the place, usually right above the bath tub. [img]http://www.constructionphotography.com/ImageThumbs/A052-01718/3/A0…
... up what happens to the flags, even now, but I can ... , very, very useful)
- PUSH, POP and the stack (where it ... -
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…
... /> lastk equ 23560 ; sysvars
flags equ 23611 ; bit 5 = key ... hl
call setchan
pop hl
; if ploop ... -
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…
... /> lastk equ 23560 ; sysvars
flags equ 23611 ; bit 5 = key ... hl
call setchan
pop hl
; if ploop ... -
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…
... /> Look up the CP instruction, flags and conditional jumps (e.g ...
call sprite8x8a
pop bc
pop hl
inc hl ... -
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…
... call text_out
and
POP AF afterwards if you want ... it modifies on entry and pop them in reverse order before ...
AND A ; this sets flags but does not do anything ...
call sprite8x8a
pop bc
pop hl
inc hl ... -
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…
... /> lastk equ 23560 ; sysvars
flags equ 23611 ; bit 5 = key ... hl
call setchan
pop hl
; if ploop ... -
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…
... /> lastk equ 23560 ; sysvars
flags equ 23611 ; bit 5 = key ... hl
call setchan
pop hl
; if ploop ... -
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…
... /> lastk equ 23560 ; sysvars
flags equ 23611 ; bit 5 = key ... hl
call setchan
pop hl
; if ploop ... -
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…
... /> lastk equ 23560 ; sysvars
flags equ 23611 ; bit 5 = key ... hl
call setchan
pop hl
; if ploop ...
