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<1…9101112131415…34>
  • help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…

    ... /> org 50000
    main ld hl,22528 ; start of attribute file ... attribute location with colour
    inc hl ; move to next attribute location ...
    Saboteur Saboteur February 2008 Development
  • problem using FRAMES to generate 'random' numbersI realise the pros use bytes from ROM to get their random numbers, presumably because they want to use FRAMES to synchronise the printing and avoid s…

    ... /> [code]
    random ld hl,(23672)
    inc hl
    ld a,h ...
    ld (23672),hl
    ld a,(hl)
    and 1
    Dr BEEP Dr BEEP March 2008 Development
  • Emulators on the ZX SpectrumHaving released a Spectrum 16K emulator for Spectrum 48/128 machines as part of CCG2008, I was wondering if anybody knows of any emulators which actu…

    ... to :
    LD HL,(vpc)
    INC HL
    LD (vpc),HL
    ...which ...
    Jimmy Jimmy March 2008 Emulators
  • Emulators on the ZX SpectrumHaving released a Spectrum 16K emulator for Spectrum 48/128 machines as part of CCG2008, I was wondering if anybody knows of any emulators which actu…

    ... br /> LD HL,(vpc)
    INC HL
    LD (vpc),HL
    ... ... br /> [code]
    BYTE1 INC DE ; Increase PC
    MAIN ... table
    LD H,(HL) ; Fetch highbyte of instructioncode ...
    JP (HL) ; Go to instruction to ...
    Dr BEEP Dr BEEP March 2008 Emulators
  • A BASIC compiler projectHi, I started my own BASIC compiler for the ZX Spectrum (and Z80 machines) 3 months ago. It's still in ALPHA stage (when it is mature, I will write …

    ... , 5
    LOOP:
    inc (hl)
    inc hl
    djnz LOOP
    End ...
    boriel boriel April 2008 Development
  • IF2 Rom snapshot creationHi, is it possible convert a Speccy 16k snapshot to a Interface 2 Rom file? I've the original Ultimate Pssst, Cookie, Trans-am and Jetpac tapes and …

    ... A,(HL)
    INC HL
    LD E,(HL)
    INC HL
    LD D,(HL)
    INC HL ...
    LD C,(HL)
    INC HL ...
    LD B,(HL)
    INC HL
    PUSH HL ...
    Jimmy Jimmy April 2008 Emulators
  • searching for ASM bookI am searching for a book with simple examples of assembler code. I found one, but i cant remember where.. i forgot even the title.. it was a scanned…

    ... /> dump 40000
    start ld hl,text
    loop ld a ... z
    rst 16
    inc hl
    jr loop
    text ...
    Dr BEEP Dr BEEP May 2008 Emulators
  • Need Help with codeHi there, let me preface this by saying I'm NOT an old school computer guy though I do remember using the internet before the WWW and my first comput…

    ... C,A
    INC (HL)
    INC BC
    LD HL,nn ; what number ... />
    [/code]

    LD HL, nn
    polomint polomint May 2008 Sinclair Miscellaneous
  • Need Help with codeHi there, let me preface this by saying I'm NOT an old school computer guy though I do remember using the internet before the WWW and my first comput…

    ... with the accumulator.

    INC (HL) increments the byte at the ... to by the hl register pair.

    INC BC increments the ... bc register pair.

    LD HL,nn ... loads the hl register pair with nn ...
    jonathan jonathan May 2008 Sinclair Miscellaneous
  • 'orange' on a spectrumalways wondered why spectrums could never seem to achieve the colour orange? wasn't one of the default colours, and don't remember seeing anything th…

    ... pattern
    ld hl,16384
    ld (hl),$f0
    ... ld d,h
    ld e,l
    inc ...
    ld (hl),a
    inc d
    inc hl
    dec bc ... hl),$cc
    ld d,h
    ld e,l
    inc ... /> ld (hl),a
    dec d
    inc hl
    dec ...
    Digital Prawn Digital Prawn August 2008 Sinclair Miscellaneous
  • Bresenhams circle algorithmI post here my final circle code to replace, if you want, the one in the ROM. It only uses integer math and runs very fast and is very compact. It is…

    ... de,hl
    add hl,de
    ex de,hl

    inc hl ;hl' is ... ddfy
    inc hl
    exx ... ' is ddfx
    inc bc

    inc hl
    inc hl
    exx
    rtunes rtunes September 2008 Development
  • CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …

    I've tried to beat 12 bytes and the best I can do is 13. My 11 byte attempt doesn't fulfill all the criteria (doesn't clear the last
    Jimmy Jimmy September 2008 Games
  • Help using M3 ramFrom the Multiface 3 manual. [quote]6.0 The Use of Extra 8K RAM --------------------------- The MULTIFACE's 8K RAM extension can be accessed and us…

    ... Easier than lots of inc hl, ld (hl), 32 poking.
    ... hl, 8195
    ld (hl), 82 ; 'R'
    inc hl
    ld (hl), ... 85 ; 'U'
    inc hl
    ld (hl ... inc hl
    inc de
    jr get

    cmpn inc hl ...
    FrankT FrankT September 2008 Development
  • BASin r14c - maintenance releaseAfter the recent discussions, BASin has been released as version 14c. It's only a maintenance release, and some of the really big new features are un…

    ... Seed
    LD HL,$D0D0
    LD (SEED),HL
    DI
    OR A
    SBC HL,DE
    SBC A,0 ...
    SBC HL,DE
    LD D,0 ... br /> JR NC,RAND
    INC HL
    RAND LD (RAND16+1 ... ),hl
    RET
    [/code]
    ...
    Digital Prawn Digital Prawn September 2008 Emulators
  • Design Design / Crystal ComputingNice post on [URL="http://groups.google.com/group/comp.sys.sinclair/browse_thread/thread/56e6ebdedc6930ac#"]comp.sys.sinclair[/URL] about [URL="http:…

    ... inc hl ; point to x coord.
    ld d,(hl) ; get coord.
    inc hl ... br /> ld e,(hl) ; get coord.
    -> inc hl ; point to ... m not sure how doing 'inc hl' helps here since the ...
    Arjun Arjun October 2008 Sinclair Miscellaneous
  • Design Design / Crystal ComputingNice post on [URL="http://groups.google.com/group/comp.sys.sinclair/browse_thread/thread/56e6ebdedc6930ac#"]comp.sys.sinclair[/URL] about [URL="http:…

    ... />
    You're right, that inc hl isn't necessary, I'll ...
    jonathan jonathan October 2008 Sinclair Miscellaneous
  • Changing the way SCREEN$ is loadedThe way the speccy loads in a SCREEN$ is interesting - top two-thirds first, then middle and finally the bottom, which is due to the way the speccy d…

    ... poke colour
    inc hl ; next attribute
    inc bc ; next ...
    screenaddress: ld hl, $4000 ; hl = screen address
    ... /> ld (hl), a ; poke to screen
    inc hl ; next ... next line
    nextline: inc hl ; next screen address
    FrankT FrankT October 2008 Sinclair Miscellaneous
  • One for the demo codersOn this occasion I forgot I had already asked the exact same question in another thread.

    ... bytes, MSB in D
    ;HL=screen attributes
    ld e ... a,(de)
    ld (hl),a
    inc l[/code]
    This ... ), then loop counter decrement and inc hl (to cross 256 bytes boundaries ...
    Shiru Shiru October 2008 Development
  • A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…

    ... [code]
    STARFIELD
    LD HL,05 ; Reset the random seed ... a

    POP HL ; retrieve pointer screen byte

    OR (HL) ; merge with current star byte ... br /> JR NC,RAND
    INC HL
    RAND LD (RAND16+1 ...
    Digital Prawn Digital Prawn December 2008 Development
  • A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…

    ... ex de,hl ;de=dest,hl=offset
    add hl,de ;hl=src,de ... ld c,(hl) ; get the address into bc
    inc hl
    ld ... b,(hl)
    ld h ... br /> JR NC,RAND
    INC HL
    RAND LD (RAND16+1 ...
    Digital Prawn Digital Prawn December 2008 Development
  • A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…

    ... the screen
    ADD HL,BC
    INC (HL) ; Increment every star by ...
    JR Z,NO_PARALLAX
    INC (HL)
    NO_PARALLAX

    LD ...
    JR NC,RAND
    INC HL
    RAND LD (RAND16+1 ...
    Digital Prawn Digital Prawn December 2008 Development
  • A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…

    ... the screen
    ADD HL,BC
    INC (HL) ; Increment every star by ...
    JR Z,NO_PARALLAX
    INC (HL)
    NO_PARALLAX

    LD ...
    JR NC,RAND
    INC HL
    RAND LD (RAND16+1 ...
    Digital Prawn Digital Prawn December 2008 Development
  • A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…

    ... screen
    ADD HL,BC
    INC (HL) ; move every ... /> JR Z,NO_PARALLAX_U
    INC (HL)
    NO_PARALLAX_U

    ADD HL,BC
    INC (HL) ; Increment every star ... /> JR Z,NO_PARALLAX_L
    INC (HL)
    NO_PARALLAX_L

    Digital Prawn Digital Prawn December 2008 Development
  • Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…

    ... 3D 5C LD HL,(5C3Dh)
    23 INC HL
    36 ... 13 LD (HL),13h
    2B DEC HL ...
    John Elliott John Elliott December 2008 Sinclair Miscellaneous
  • Using INPUT without clearing last two lines of screen?I'm trying to print to the 22nd row of the screen using the ol' print #0 trick. Unfortunately, I require user INPUT which seems to wipe out the botto…

    ... BC is used because HL and DE are more ... />
    [code]
    ld hl, address_of_character_string
    .loop
    ld ... a, (hl)
    and a ; This tests ... z
    rst 16
    inc hl
    jr .loop
    ...
    Winston Winston January 2009 Sinclair Basic
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... A1
    LD (HL),0
    INC HL
    JR A2
    RET NZ
    INC HL
    JR A4
    ... LD A,(HL)
    INC A
    RET NZ
    INC HL
    ...
    RET NZ
    INC HL
    JR A8
    ... br /> RST $10
    INC HL
    JR PR
    MSSTR ...
    jp jp January 2009 Games
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ...
    INC HL

    LD (HL),E

    INC HL
    ... CreateHexDigit
    LD (HL),A
    INC HL

    ... CreateHexDigit
    LD (HL),A
    INC HL

    ... CreateHexDigit
    LD (HL),A
    INC HL

    ...
    Digital Prawn Digital Prawn January 2009 Games
  • So you want to make a cardgame......but you haven't got a good deck to display. Well here is a fully relocatable routine that will do the job for you. Place the code anywhere in me…

    ...
    nofnd INC HL
    DJNZ ... colfnd
    INC HL
    DJNZ ...
    Dr BEEP Dr BEEP January 2009 Development
  • Atic Atac speed.Dear all, Excuse the noob question, but does anyone know how fast Atic Atac runs at? What I mean is, frames per second, or the amount of pixels the…

    ... 257 byte vector table
    inc hl
    djnz IntSet
    ld ... (1 frame info only)
    inc hl
    cp LASTFXCODE ; new control ... (BEEPPORT),a
    ld b,(hl)
    inc hl
    Hiss0: ld a ...
    frobush frobush January 2009 Games
<1…9101112131415…34>

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