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  • New Game - Pietro Bros [z88dk/Nirvana+][b]PIETRO BROS[/b] Pietro and Luizo were transported to pipe world after eating some rancid mushrooms on his pizza. Help them to escape from th…

    ... sp,__CODE_head ; move stack underneath program
    ld iy,128 ; move IY into ...
    Alcoholics Anonymous Alcoholics Anonymous December 2016 Brand new software
  • Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…

    ... ld (sp_save+1),sp ;save SP to be restored at ... counter

    ex af,af' ;overlay byte ... push af ;save
    ex af,af' ;save
    ...
    Arkannoyed Arkannoyed March 2017 Development
  • Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…

    ... 1),a ;store
    ex af,af'

    sp ;save SP to be restored at ... push af ;save
    ex af,af' ;save
    ...
    Arkannoyed Arkannoyed March 2017 Development
  • ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…

    ... ; 11t - store hl for later (sp=store pos)
    ld a ... move de on one
    ex de,hl ; 4t - swap hl ... - move hl on one
    ex de,hl ; 4t - swap back ... ; 10t - bring back mem pos (sp=free)
    inc hl ; 6t ...
    TomD TomD April 2017 Development
  • ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…

    ... ; 11t - store hl for later (sp=store pos)
    ld a ... move de on one
    ex de,hl ; 4t - swap hl ... - move hl on one
    ex de,hl ; 4t - swap back ... ; 10t - bring back mem pos (sp=free)
    inc hl ; 6t ...
    TomD TomD April 2017 Development
  • z88dk multicolour enginesI've been trying to work out how the multicolour sprite engines have been implemented in z88dk. It's not obvious. Looking in the source, I found …

    ... 32767 which will also set SP=32767 underneath the program) and ... REGISTER_SP = -1 // do not change sp (below CLEAR in loader)
    IY (the engine was written to ...
    Alcoholics Anonymous Alcoholics Anonymous July 2017 Development
  • shadow regs musingIn the process of optimising some assembler, it occurred to me how great it would have been if the Z80's shadow reg opcodes had been a bit more fully…

    ... have LD r,r do EX r,r' allowing for easier ... 've add many occasions where EX A,A' would be helpful ... and FD select IX and IY instead of HL. One prefix ... ability to insert exx (and ex af,af') automatically but haven ...
    gp2000 gp2000 August 2017 Development
  • ZX Spectrum Z80 Development Environment on WindowsHi Folks, Just wondering what the recommendation is for a ZX Spectrum Z80 Development environment on Windows? Getting fed up with hand coding Z80…

    ... anyway), or EXA and not EX AF,AF' (simple names for ... :

    [code]
    ldi (iy+nn),bc
    ldi l ... probably means load and increment iy), some I can't be ...
    Alcoholics Anonymous Alcoholics Anonymous August 2017 Development
  • ZX Spectrum Z80 Development Environment on WindowsHi Folks, Just wondering what the recommendation is for a ZX Spectrum Z80 Development environment on Windows? Getting fed up with hand coding Z80…

    ... /> ld hl,(sp+ch2) ; get source pointer
    ex de,hl ; save ... in register DE
    ld hl,(sp+ch1 ... , look at the "ld hl,(sp+ch2)" no need to do ...
    Alcoholics Anonymous Alcoholics Anonymous August 2017 Development
  • Most played games: Pirated vs BoughtMy confession of guilt in the piracy thread that I'd never legitimately bought an Ultimate game, despite playing Knight Lore to death BITTD, led me t…

    ... to 24832:
    LD SP, 24830
    LD IY, 23610
    JP ...
    spider spider September 2017 Games
  • BREAK key on 128k SpectrumWhat happens when BREAK is pressed on a 128k Spectrum? Why is it different from what happens on a 48k Spectrum. Is there a way to disable it or to …

    ... TRAP: di
    dec sp
    dec sp ;preserve error return on ... MCTRAP: di
    dec sp
    dec sp ;preserve error return on ... -NEW
    bit 4,(iy+$01)
    jr z,MCCONT ...
    Battle Bunny Battle Bunny February 2018 Sinclair Basic
  • Ensure program runs in USR 0 mode?Is there some BASIC that can be used in a program to make sure the the program runs (even on 128k models) in 48k or USR 0 mode? I obviously then wan…

    ... USR0: res 4, (iy+1) ; Switch to ... GOSUB)
    ld sp, hl
    ... /> ld (ERRSP), sp
    ret ; ...
    colonel32 colonel32 February 2018 Sinclair Basic
  • How to apart a 16K from a 48K?How can I understand that if i have a 16K or 48K? Thanks

    ... ,[b]REPORT_4[/b]
    07947 EX DE,HL
    07948 LD ... [/b]
    07954 SBC HL,SP
    07956 RET C
    spider spider October 2018 Sinclair Miscellaneous
  • My AGD games have AY music (finally!)!!Thanks to David Saphier six of my AGD games have AY music you can play them onine or download them at zxbasic.uk https://www.youtube.com/watch…

    ... ix
    push iy
    exx
    ex af,af'
    push ... af
    ex af,af'
    exx
    pop iy
    pop ...
    Alessandro Grussu Alessandro Grussu March 2019 Announcements
  • 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…

    ... it] - stash the SP just after you push IY).

    ... sp, (stashed_sp) ; restore sp to what it was on entry after pushing IY ...
    pop iy ... ; restore iy before returning to ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • 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…

    ... it] - stash the SP just after you push IY).

    ... sp, (stashed_sp) ; restore sp to what it was on entry after pushing IY ...
    pop iy ... ; restore iy before returning to ...
    Kotek Kotek June 2022 Development
  • 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…

    ... it] - stash the SP just after you push IY).

    ... sp, (stashed_sp) ; restore sp to what it was on entry after pushing IY ...
    pop iy ... ; restore iy before returning to ...
    Kotek Kotek June 2022 Development
  • 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…

    ... what happens if you change IY somewhere as well... it will ... not break if you modify IY (I gave details earlier in ... /> ; we don't faff with IY register or interrupts so we ... byte of screen address
    ex de, hl ; hl = screen address ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • 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…

    ... /> ; we don't faff with IY register or interrupts so we ... byte of screen address
    ex de, hl ; hl = screen address ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • 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…

    ... /> ; we don't faff with IY register or interrupts so we ... byte of screen address
    ex de, hl ; hl = screen address ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • 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…

    ... /> ; we don't faff with IY register or interrupts so we ... byte of screen address
    ex de, hl ; hl = screen address ...
    Kotek Kotek June 2022 Development
  • 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…

    ... /> ; we don't faff with IY register or interrupts so we ...
    Kotek Kotek June 2022 Development
  • 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…

    ... /> ; we don't faff with IY register or interrupts so we ...
    Kotek Kotek June 2022 Development
  • 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…

    ... /> ; we don't faff with IY register or interrupts so we ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • 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…

    ... /> ; we don't faff with IY register or interrupts so we ...
    Paradigm Shifter Paradigm Shifter July 2022 Development
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