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<1…15161718192021…34>
  • Need to read code start and length from a +3 diskso i can transfer them to my internal ZXMMC interface and my mind has died as to how to do it (i know how to for a tape) any help or a general kick i…

    ... br />
    pop hl ;Filename
    push hl
    ld bc,5 ... found

    call DOS_OPEN
    pop hl ;Filename address
    jr ... br /> ld bc,0
    call DOS_READ
    jr nc,finish ...
    ld bc,0
    call DOS_CLOSE
    ;
    ; Switch ...
    John Elliott John Elliott May 2009 Sinclair Miscellaneous
  • Russian Translations...As i have once again been reminded (by the "Homebrew games" thread), there are some funky looking Russian games that I can't play due to not understa…

    ... from [b]CALL 60190[/b] to [b]CALL 65000[/b] ... ORG 65000

    CALL 60190

    LD B ... 16744
    LD HL,English1

    CALL print_6row_bitmap

    LD HL,English2

    CALL print_6row_bitmap

    Digital Prawn Digital Prawn June 2009 Games
  • Interface One - New FunctionalityAs you may (or may not) be aware the Interface One is a pretty powerful piece of kit. One of it's greatest features is being able to easily extended …

    ... if runtime
    POP HL ;Drop returnadress
    JR ... ;Int. to BC
    POP HL
    RET

    ;--------------------------------------------------
    F_AND CALL F_exp2num ;Entry expect 2-num ...
    roko roko July 2009 Development
  • +3 Centronics port: How does it work?I've been trying to follow the code with Fuse's debugger and I can't see it writing anywhere except to port 0x1ffd. It also jumps through some fairly…

    ... :
    [CODE]
    lpt_write:
    call lpt_ready
    jr nc, lpt_write ... ;Latch output lines
    ld hl,0FFF9h ;SVC_BANK_68, Last value written ...
    di
    ld a,(hl) ;Pull STROBE down
    and ... (c),a
    ld a,(hl)
    ei
    out (c ...
    John Elliott John Elliott July 2009 Hardware
  • Quadrax - Compatibility problems - help!I bought this game last month and when I tried to load it today...it crashes in my +2A!!! Sh*t!! the game was expensive to get, and now I can't play …

    ...
    scf
    call 1366
    jr nc, ... (#7de3),hl

    ld hl,#7e4a
    ld (hl),#3b ... l,#4d
    ld (hl),#32 xor #5e
    ...
    Bob Stains Bob Stains July 2009 Games
  • Interface One - New FunctionalityAs you may (or may not) be aware the Interface One is a pretty powerful piece of kit. One of it's greatest features is being able to easily extended …

    OK, I've coded this to add a @DEEK function to Spectrum with IF1.
    The caveat is that it only works within a LET statement, in this form:

    LET n=@DEEK v

    Where 'n' is any numeric variable, and 'v' any numeric expression BC (or ...
    RST#08 RST#08 July 2009 Development
  • 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…

    ... active when you make the call to +3DOS, but internally ... /2/3 configuration)
    ld hl,32768 ; start address
    ...
    ld iy,DOS_READ
    call dodos
    [/CODE]
    < ... 16K. You can quite happily call this routine from anywhere, ...
    glancaster glancaster August 2009 Development
  • Youtube DumpI think there was a thread containing only Youtube vids before but I can't find it so here's a new one. To start, here's my current favourite Mighty …

    ... Patriotic War, or as we call it in America, WWII.
    deadpan666 deadpan666 August 2009 Chit chat
  • Has any programmers recently pushed the spectrum to the limits?Hi there. Ive just discovered this great forum and I was brought up with the speccy 16,48 and then 128k. Im just wanting to know if there are any re…

    ... ),A
    LD (HIATT),HL
    CALL HIRON
    LD B,L ... HL, 0810H
    PUSH HL
    LD HL, 0810H
    PUSH HL
    LD HL ... , 0810H
    PUSH HL ...
    AMW AMW August 2009 Development
  • can someone help with a rom routinei have been trying to draw a simple line with a the rom routine , but i just cant get it to work , so if anyone can give me an example in z80 that wo…

    ... EXX
    PUSH HL ;you must preserve HL' as ROM corrupts it ... /> CALL 024BAH ;draw the line from current coordinates
    POP HL ;restore HL ... it's important to save HL' register for successful exit to ...
    RST#08 RST#08 August 2009 Development
  • DivIDE QuestionHi all, I've been trying to work out how the DivIDE works and after reading and re-reading the DivIDE programming model document by Zilog I think it…

    ... /> 8184 RET
    8185 JP (HL)
    ...
    ...

    - If ... .

    - Is also possible call original RST16 on 48ROM from ...
    velesoft velesoft August 2009 Development
  • DivIDE QuestionHi all, I've been trying to work out how the DivIDE works and after reading and re-reading the DivIDE programming model document by Zilog I think it…

    ... the address you want to call.
    * Call it/page out.

    [code]
    ld hl, stringaddr
    .loop
    ld ... a, (hl)
    and a
    ret ...
    defw 0x0010
    inc hl
    jr .loop
    ...
    Winston Winston August 2009 Development
  • Implementing goto on error condition...OK, so when I'm reading a file or directory on a network filesystem, when I reach EOF, it's not actually useful at all for ZX BASIC to stop the progr…

    ... probably destroyed IY=23610 or HL'=..... (10077 ?)
    I have this ... HL
    dec HL
    ld (HL),#13
    dec HL
    ld (HL),#03 ... -4 address
    dec HL
    ld (23613),HL ;ERR-SP (clearing ... )
    jp #1BB0 ;must be call, I think

    I ...
    roko roko October 2009 Development
  • Implementing goto on error condition...OK, so when I'm reading a file or directory on a network filesystem, when I reach EOF, it's not actually useful at all for ZX BASIC to stop the progr…

    [QUOTE=roko;390053]1:
    You probably destroyed IY=23610 or HL'=..... (10077 ?)
    [/QUOTE]

    I go for 10072 (tested with EXX, PUSH HL, EXX, POP BC, RET and the PRINT USR CALL)
    Dr BEEP Dr BEEP October 2009 Development
  • The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…

    ... noret ld d,(hl)
    nbyte ld a,(hl)
    rst # ... br /> djnz print
    call nc,#22b0
    jr nc ... ,nbyte
    start ld hl,tab+4
    print ...
    Dr BEEP Dr BEEP October 2009 Development
  • The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…

    ... in that routine (also INC HL is missing). I am working ... a 'GOTO to MC' or 'CALL from Basic' which makes it ...
    Dr BEEP Dr BEEP November 2009 Development
  • The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…

    ... ld a,(de)
    8 call lprint
    11 ld ... a,1
    24 rlc (hl)
    26 rla
    ... jr nc,24
    30 call print
    33 inc ... ld a,10
    50 call lprint
    53 ld ... a,13
    55 call #1708
    58 push ... bc
    59 call nnn
    62 pop bc ...
    Dr BEEP Dr BEEP November 2009 Development
  • AY programming and notes frequencyHello everybody, I'm Targhan from the french CPC group Arkos, perhaps you've heard of us. I'm currently working on a music tool and I'd like to k…

    ... ix,ChanA
    ld hl,(AYREGS+AR_TonA)
    call chregs
    ld ... ix,ChanB
    ld hl,(AYREGS+AR_TonB)
    call chregs
    ld ... hl,(AYREGS+AR_TonC)
    call chregs
    ld (AYREGS+AR_TonC),hl
    ld hl ...
    chev chev November 2009 Development
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... address of data
    call 0x0556 ; input from tape ... /> set_palette:
    ld hl, image+6912 ; HL = address of registers
    inc hl ; advance pointer
    inc ...
    display:
    ld hl, image ; source
    ld ...
    chev chev November 2009 Emulators
  • Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …

    ... ,
    invoke a MASK-INT call at the same time, in ... HL,10000 ;just chosen to get a measurable result
    LOOP: CALL ... inside MASK-INT
    DEC HL ;6 count
    LD A ...
    roko roko November 2009 Development
  • Spin Assembler DirectivesLeading on from [URL="http://www.worldofspectrum.org/forums/showpost.php?p=402514&postcount=65"]jp's recent post in Spin 0.7 Public Testing thread[/U…

    ... : '(E)'; I: 158),
    (S: '(HL)'; I: 140), (S: '(SP)'; I ... : 'C'#39; I: 131), (S: 'CALL'; I: 6),
    (S: 'CCF ... shl 8)), (S: 'HL'; I: 115),
    (S: 'HL'#39; I: 119 ...
    Dunny Dunny November 2009 Emulators
  • Spin Assembler DirectivesLeading on from [URL="http://www.worldofspectrum.org/forums/showpost.php?p=402514&postcount=65"]jp's recent post in Spin 0.7 Public Testing thread[/U…

    ... : '(E)'; I: 158),
    (S: '(HL)'; I: 140), (S: '(SP)'; I ... : 'C'#39; I: 131), (S: 'CALL'; I: 6),
    (S: 'CCF ... shl 8)), (S: 'HL'; I: 115),
    (S: 'HL'#39; I: 119 ...
    jp jp November 2009 Emulators
  • When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers

    ... your startroutine or do you call it AFTER the startmessage?
    [code]
    ld hl,(23672) ; use timer as seed ...
    inc hl ; point to next
    ld ... more randomness
    ld (23672),hl ; store random number
    ret ...
    Dr BEEP Dr BEEP November 2009 Development
  • AY programming and notes frequencyHello everybody, I'm Targhan from the french CPC group Arkos, perhaps you've heard of us. I'm currently working on a music tool and I'd like to k…

    ... ix,ChanA
    ld hl,(AYREGS+AR_TonA)
    call chregs
    ld ... ix,ChanB
    ld hl,(AYREGS+AR_TonB)
    call chregs
    ld ... hl,(AYREGS+AR_TonC)
    call chregs
    ld (AYREGS+AR_TonC),hl
    ld hl ...
    chev chev November 2009 Development
<1…15161718192021…34>

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