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<1234567…34>
  • Floating bus on 128K models[b]Background:[/b] i need run code with interrupt enabled but i need use stack instruction to maximize performance in copy/shift/mirror routines. dur…

    ... possible IM2 routine - a single RET or RETI - will still place the return ...
    Marko Marko November 2010 Development
  • New game: SolarGun 1.0[img]https://dl.dropboxusercontent.com/u/75238938/solargun4.png[/img] [img]https://dl.dropboxusercontent.com/u/75238938/solargun5.gif[/img] (that g…

    ...
    ld (hl), #0xc9 ; 'ret'. Should be reti, but that's 2 ... to 0xffff which has our ret instruction.
    [/quote]

    RET (or RETI) won't cut it.
    RMartins RMartins March 2016 Brand new software
  • Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…

    ... . i.e to FFFF or FEFE or or FDFD or BFBF (49087) if you ... be bank-safe.

    RET or RETI, doesn't really matter at ... noticed, you have to EI or another one won't occur ... interrupt routine that does a RET. Then you do EI and ...
    joefish joefish November 2016 Development
  • 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,…

    ... increments or decrements a 16-bit number: PUSH, POP, CALL, RET, RST, RETI ... circuits (adding to the cost) or use the ALU instead (which ...
    GReW GReW November 2016 Assembler
  • Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…

    ... (so i know whether to "ret" or do something else - see question ... use of ZXSpin's debugger - or maybe the +3DOS bootloader- which ... m also considering writing some (or maybe all!) of it using ... , especially doing a disk catalogue or changing the user number), but ...
    rbsfou rbsfou January 2007 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... plain Z80, RET and RETI works exactly the same, except RETI is longer ... and slower, so RET ... has ended upon executing the RETI.
    I think this ... the ULA generated interrupt by RETI.

    [url="http:// ...
    Mikie Mikie July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... Considering the plain Z80, RET and RETI works exactly the same, ... except RETI is longer and slower, so RET ... the ULA generated interrupt by RETI.
    [/quote]

    RETI" mainly because you have ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • How to hack game to find pokes for infinity life and others!Hello! Maybe this has been discused before, but I coulden't find anything via search. My question is this. How do you find the pokes for infinity …

    [quote]
    How do you find the pokes for infinity life and other pokes in games?
    [/quote]

    You look for likely instruction sequences that decrement counters and then change them so they either do not decrease, or do a ret or whatever.
    cyborg cyborg November 2004 Games
  • How to speed up TZX loading (emu development)With many newer emulators there are options to do faster loading schemes, even for turbo-loader or protected loader blocks in TZX files. For example,…

    ... the main, loaders will increment or decrement the B register while ... whether they have a 0 or a 1 pulse.

    or develop a series of tests ... B accordingly and perform a RET (or whatever the loop requires to ...
    Dunny Dunny May 2006 Emulators
  • Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…

    ... (so i know whether to "ret" or do something else - see question ... define structures, put in floats or whatever.

    So ... /> ld a,(hl)
    or a
    ret z
    inc hl ... especially doing a disk catalogue or changing the user number), but ...
    Alcoholics Anonymous Alcoholics Anonymous January 2007 Development
  • My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…

    ... EXX by using IX register or setting and reseting some bits ... /> JP PE,LOOP
    RET

    ; or avoiding the IX...
    omega omega April 2007 Development
  • Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…

    ... forget the EI before the RET or the keyboard won't work ...
    Winston Winston October 2007 Hardware
  • Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…

    ... forget the EI before the RET or the keyboard won't work ...
    DEATH DEATH October 2007 Hardware
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... bothered and EI followed by RET or NOP when you do. ... critical stuff
    ei
    ret


    ...
    pop af ; -"-
    ret

    exit_critical_section:
    ... ei here
    ei
    ret
    exit_without_ei:

    tstih tstih April 2011 Development
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... bothered and EI followed by RET or NOP when you do. However ...
    Winston Winston April 2011 Development
  • Disabling the +3 disk buffer; yes, but how?I would like to disable the +3 disk buffer in order to retrieve those 4K from the machine's RAMdisk. By reading the computer manual and some posts on…

    ... loaded once, and a cache or buffer doesnt make hardly any ... ),A
    EI
    RET

    or

    10 CLEAR ...
    nuggetreggae nuggetreggae February 2013 Sinclair Basic
  • Get rid of 'Bytes:' when loading codeHow do you hide the 'Bytes:' when loading code? I've tried saving as CHR$ 22 + CHR$ 6+ CHR$ 0 (a blank part of the loading screen) but it still appe…

    ... /> SCF
    CALL 1366
    RET (or JP Exec Address if you ...
    spider spider December 2013 Sinclair Basic
  • 64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…

    ... />

    maybe to use "ret"-c2p?

    for example ... /> ld sp,line[n]
    ret ->

    #e0e0..#fefe ... ),XYdata3
    inc l
    ret

    if mask, then ...

    inc l
    ret

    or smth else...
    char char December 2014 Development
  • What am I doing wrong here?[code]IF INKEY$=SCREEN$ (21,4) THEN LET SCORE=SCORE+1[/code] It's delivering a positive every time.

    ... the SCREEN$ result. After the RET there's a JP $25DB ... at $257D changed to a RET, or else write a replacement USR ...
    Battle Bunny Battle Bunny May 2016 Sinclair Basic
  • r-type in development for the sam coupehttp://cookingcircle.co.uk/ we need z80 coders graphics artists and audio this is the amstrad cpc 6128 version: https://www.youtube.com/watc…

    ... PUSH instructions followed by a RET or Register Indirect JP, such as ...
    AndyC AndyC May 2016 Development
  • Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …

    ... fill_screen. Since there's no RET or anything you seem to be ...
    Hikaru Hikaru August 2016 Development
  • Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …

    ... fill_screen. Since there's no RET or anything you seem to be ... sort of system variables etc. Or the fact that the interrupt ...
    pointblnk pointblnk August 2016 Development
  • 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,…

    ... can PUSH too many things, or POP too many, and the ... number off again before you RET, or it'll return to the ...
    joefish joefish November 2016 Assembler
  • Komando 2 incompatible with the +2A models, anyone could supply a poke or a loader to make it work?http://www.worldofspectrum.org/infoseekid.cgi?id=0002734 Is any way to make it work in the +2A models with a loader or poke? Thanks!

    ... poked, contains either compressed data or is free, hence messing with ... either break/cripple compression data or it will just be ... ends, and replace a RET or JP instruction or something like that, that ... poke routine.

    Or you could make it return ...
    RMartins RMartins August 2017 Games
  • Witchcraft: Nirvana, Bifröst and such[url="http://www.rgcd.co.uk/2011/10/buzzsaw-zx-spectrum.html"]"When considering this next to nearly every other ZX Spectrum game though, Buzzsaw is l…

    ... enable the next interrupt then RET, or if you want to continue ...
    joefish joefish January 2018 Sinclair Miscellaneous
  • Does Supertest actually end?I've been playing a few games of Daley Thomson's Supertest lately (128K version) and often wondered does the game end of do the targets just get toug…

    ... drop off after a while or stop. I think this level ... not SuperTest IIRC the high or long jump would just increase ... changing say a RET NZ or RET Z for a RET or such (at a ...
    spider spider January 2021 Games
  • 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…

    there's no ret or jump there so it will carry on into cls, if that's your real code?

    Also you need to pass the attrib value you need to set in the A register.
    Paradigm Shifter Paradigm Shifter July 2022 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... AF

    ei
    reti

    Start:
    ... CALL PChar


    RET
    ; WCHAR

    ; ... 4 = X Direction = 0, SPRLEFT or SPRRIGHT
    ; 5 = Y Direction ...
    robpearmain robpearmain August 2004 Development
<1234567…34>

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