-
BREAK from GOSUBHere's another one. Just in case you wanted to break out of multiple GOSUB levels with a single command, here's a routine to do it, tested on all mod…
... 3 bytes
EX (SP), HL ;restore (ERR_SP)
EX DE, HL
LD (23613 ... ), SP ;reset ERR_SP
PUSH ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... :
[CODE]
...
pop hl
pop af ; A=col ...
push hl
ld c,a ; BC ... /> [CODE]
...
pop hl
ex (sp), hl ; Swaps hl with top of the ... -
Multicolour demo using z88dk + BIFROST* (+source)This is just a demo to show how to show multicolour using z88dk, using the BIFROST* engine (more info [URL="http://www.worldofspectrum.org/forums/sho…
... of: ld hl,6
add hl,sp
ld a,(hl) ; row
BIFROST_setTile_callee:
pop hl ; hl = ret address
pop bc ... /> pop de ; e = col
ex (sp),hl ; l = row
...
number padding functionI wrote a number padding function in BASIC a while ago, but when I came to want it again I couldn't find it, so I've done this enhanced [url=http://w…
... inc sp
inc sp
pop hl ;HL=$000D
ex (sp),hl ;HL=$106E ...
push hl
question re. STR$ bugCould someone point me to whereabouts in the ROM this goes wrong? [code]PRINT PAPER 5;1;STR$ 234[/code] (Only the "1" prints in cyan.) It's not the m…
This routine (48 bytes) provides a BASIC replacement for STR$ which fixes those two bugs; use "FN s$(numeric_expression)" instead of "STR$ numeric_expression". I copied the ROM's method used in CIRCLE & DRAW for checking -1z88dk vs. sdccI've just read this article (in Spanish) [url]http://www.cpcmania.com/index2.asp?urldest=Docs/Programming/SDCC_vs_z88dk_Comparando_tama%F1o_y_velocid…
... /> ld hl,#2
add hl,sp
ld e,(hl)
inc hl
ld d,(hl)
inc hl ... bc
pop de
ex (sp),hl
asm_memset:
In Java for ZXHi All I am glad to notify you that I have opened the sources of my J2Z80 translator (0.1 version) which allows to use Java toolchain to generate Z8…
... frame
LD HL,0
ADD HL,SP ; HL equ SP
... L,A
ADD HL,SP ; HL is the first argument
SP,IX ; write in SP the first cell
EX (SP),HL ; ... the return address restored
EX ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... significant word
ex de,hl
ld e,c
pop de
ex (sp),hl
asm_itoa:
invalid_base:
ex de,hl
ld (hl),0 ; empty string returned ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... hl,bc ; hl = j + size
ex (sp),hl
ex de,hl
sbc hl,bc ; hl ... = j - size
; hl ...Help needed...I am at my wits end with this pigs ear of a routine, can anyone simplify it and make it work as it should? Basically it should make the characters '…
... inc sp
inc sp
pop hl ;HL=$000D
ex (sp),hl ;HL=$106E ...
push hl
Asking for help: ZXBC to ASM routine translationHallo, In order to save some bytes and gain speed, I'm asking for translation of a very simple ZXBC routine to Assembler [code] sub light(x as uinteg…
... )
add hl,hl
add hl,hl
add hl,bc
... br /> add hl,de
or (hl)
ld (hl),a
... candles1:
asm
ld hl,777 ;'Address of Level poked ... pop bc ; B=y
ex (sp),hl ; H=intensity
cp 32 ...Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …
... /> ex (sp),hl ;bc = len, hl=offs
push de
ex de,hl
ex ...
ld a,(hl)
add hl,bc
ex de,hl
apwritebyte ... />
ex (sp),hl ;bc = len, hl=offs
push de
ex de,hl
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... ]=b2
add hl, de
ex de, hl
inc iyl ...
pop hl
dec ... /> call exo_getpair ;bc=offset
ex (sp), hl
ld d, h
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... /> PUSH HL and POP HL can be replaced by EX DE,HL as far ... [i]=b2
add hl, de
ex de, hl
inc iyl ... ;8
ex de, hl
ld h, (hl)
ex de, hl
ld ...Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …
... ,(hl)
add hl,bc
ld (hl),a
ex af,af'
ex ... de,hl
inc ... /> ex (sp),hl ;bc = len, hl=offs
push de
ex de,hl
ex ...ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... />
; copy previous sequence
ex (sp), hl ; store source, restore destination
; copy previous sequence
ex (sp), hl ; store source, restore destination
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
...
; copy previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = destination - ...ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
...
; copy previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = destination - ...ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
...
; copy previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = destination - ...
