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<1…17181920212223…34>
  • Back to Skool disassemblyAs mentioned in [url="http://www.worldofspectrum.org/forums/showthread.php?t=22841"]this thread[/url], I've been working on a disassembly of Back to …

    ... /> ex af,af'
    ld hl,Table

    Loop ld ... ,c
    and d
    jp z,Done
    ex af ... ,af'
    or (hl)
    ex af,af'
    Done inc hl
    srl d
    jp nz,Loop
    Mr Millside Mr Millside July 2009 Development
  • 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
  • 15 years of waitingJust wondered if anyone had waited an exceptionaly long time to play an highly anticipated new game release only to have it gather dust on a shelf un…

    ... one and sold me his JP version since he couldn't ... . I got Final Fantasy Tactics JP a few months later, borrowed ... one I actually played was HL? because EA distributed it. Some ...
    XTM of TMG XTM of TMG July 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…

    ... HL, 0810H
    PUSH HL
    LD HL, 0810H
    PUSH HL
    LD HL ... , 0810H
    PUSH HL ... />
    LABEL ORG 0FDFDH
    JP HIRES
    ORG LABEL
    AMW AMW August 2009 Development
  • The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…

    ... ...
    [code].calc_checksum
    xor (hl) ; merge data byte into checksum ...
    cpi ; inc hl, dec bc, set PO=true ... if BC=0
    jp pe,calc_checksum[/code]
    Kudos ...
    gasman gasman September 2009 Development
  • Jumping to BASIC after importing 23296,1703Sorry for the confusing title. :-D Now that I've learned how to stop a game from starting after loading (in Fuse and Specemu), I have a few more que…

    ... bit in FLAGS
    ld hl, (23730) ; get RAMTOP
    ld sp, hl ; set the stack
    ... :p
    push hl
    ld hl, 4867 ; address of ... -4 in ROM
    push hl
    ld (23613), sp ... ; errors return here
    jp 7030 ; address of STMT-RET ...
    Marko Marko September 2009 Sinclair Miscellaneous
  • 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 ... that the editor needs HL', and the rasp might ... HL
    dec HL
    ld (HL),#13
    dec HL
    ld (HL ...
    dec HL
    ld (23613),HL ;ERR-SP ( ...
    (EI)
    jp #1BB0 ;must be call, ...
    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…

    ... /> [CODE]ORG 40000
    POP HL ;drop the normal RET from ... USR (#2D2B)
    LD HL, line_number_to_jp_to
    LD A, ... /> LD (23620),A ;NSPPC
    JP #1B9E ;Line-New[/CODE]
    roko roko October 2009 Development
  • Tinkering with Quique Llar?a's Midi2Ay tool...Im tinkering with Quique Llar?a's Midi2Ay tool, found at: [url]ftp://ftp.worldofspectrum.org/pub/sinclair/tools/pc/midi2ay-0.1.zip[/url] Im not a v…

    ... hl,0feffh
    ld (hl),rsi and 0ffh
    inc hl
    ld (hl ... regsiters

    pop hl
    pop bc
    pop ...
    salta inc hl
    inc hl
    ld (pos),hl
    ;; ei ...
    ;; ret

    jp exit
    Alcoholics Anonymous Alcoholics Anonymous 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…

    ... a,1
    24 rlc (hl)
    26 rla
    27 ... /> 62 pop bc
    63 jp #1748
    tab defb 13 ...
    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…

    ...
    ld (AYREGS+AR_AmplB),hl
    jp rout_a0
    pt3_init:
    ... /> ex de,hl
    nosig:
    sbc hl,de
    jp p,set_stp ... +012h)
    add a,(hl)
    jp p,ch_ntp
    xor ... /> ex de,hl
    ch_stpp:
    sbc hl,de
    jp m,ch_amp ...
    chev chev November 2009 Development
  • Creating a Spectrum game that won't load...Dear All, I have recently been using my ZX Spectrum as a reference for the production of a new body of art work and something I keep coming back to …

    ... screen)

    LD HL,$0C98 ;timing
    EX AF ... /> DEC H
    JP P,SALEAD ;2 sec leader ... br /> LD L,A
    JP SASTART

    SALOOP LD ... ,1
    SCF
    JP SA8BIT

    SAPAR ...
    SA8BIT RL L
    JP NZ,SABI1
    DEC DE ...
    roko roko November 2009 Sinclair Miscellaneous
  • Speccy games programmingI've got a question. Where games written in pure machine code or was it a level higher with Assembly language being the choice? I always thought it…

    ... A
    ld (hl),a ;Restore it
    jp nop_back_adds_loop ;Do the ... rest

    nop_back_done exx ;Bring back HL ...
    Chris Pile Chris Pile November 2009 Games
  • Speccy games programmingI've got a question. Where games written in pure machine code or was it a level higher with Assembly language being the choice? I always thought it…

    ... A
    ld (hl),a ;Restore it
    jp nop_back_adds_loop ;Do the ... rest

    nop_back_done exx ;Bring back HL ...
    Retrobrothers Retrobrothers November 2009 Games
  • 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 …

    ... /> LD (23673),A
    LD HL,10000 ;just chosen to get ... inside MASK-INT
    DEC HL ;6 count
    LD A ...
    OR L ;4
    JP NZ,LOOP ;10

    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 ... shl 8)), (S: 'HL'; I: 115),
    (S: 'HL'#39; I: 119 ... : 'IYL'; I: 156),
    (S: 'JP'; I: 51), (S: 'JR'; I ...
    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 ... shl 8)), (S: 'HL'; I: 115),
    (S: 'HL'#39; I: 119 ... : 'IYL'; I: 156),
    (S: 'JP'; I: 51), (S: 'JR'; I ...
    jp jp November 2009 Emulators
  • 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…

    ... a
    ld (AYREGS+AR_AmplB),hl
    jp rout_a0

    p3x_init ... /> ex de,hl
    nosig:
    sbc hl,de
    jp p,set_stp ... ix+012h)
    add a,(hl)
    jp p,ch_ntp
    xor ... /> ex de,hl
    ch_stpp:
    sbc hl,de
    jp m,ch_amp ...
    chev chev November 2009 Development
  • Z80 'EXX' ConfusionI was working on a little Z80 routine last evening, and, having run out of registers, resorted to sticking one of the values into a memory location a…

    ... 62000

    LD HL,BYTES

    EXX< ... COLOR="Red"]PUSH HL[/COLOR][/B]
    LD HL,32

    LD (HL),123
    INC HL

    EXX ... DEC HL
    LD A,L
    CP 0
    JP ... NZ,LOOP

    [B][COLOR="Red"]POP HL[/COLOR ...
    RoseCotton RoseCotton November 2009 Development
  • Machine Code Microdrive File LoaderI've been experimenting with transferring games to run from microdrive. Typically I like to see a loading screen while things are happening, and I li…

    ... proof of concept
    ; mailto: jp@drumfu.com
    ;
    ; updated ... push ix
    pop hl
    add hl,de
    ld de ... br /> ;
    rom1tab jp $1b29 ; optempm
    jp $15ac ; lvmch + ... br /> ;
    rom2tab jp $1b05 ; optempm
    jp $199d ; lvmch + ...
    jp jp December 2009 Development
  • Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…

    ... 58 ; d1d1 - d1d3 ------- JP to im2 service routine (im2 ... /> push de
    push hl

    XREF ... music_routine

    pop hl
    pop de
    pop ... 0xd1d1, 195); // poke z80 JP instruction
    wpoke(0xd1d2, my_isr ...
    Alcoholics Anonymous Alcoholics Anonymous December 2009 Development
  • lol cat lives ?Had this pic for a while, just had a quick text change to something more speccy appropriate. [IMG]http://img.photobucket.com/albums/v294/yellow_spid…

    DEC (HL)

    decreases the contents ... memorylocation pointed by by HL.

    So HL point to the ... /> DEC A
    OR
    JP Z,EXITUS

    OR ...
    Dr BEEP Dr BEEP January 2010 Chit chat
  • lol cat lives ?Had this pic for a while, just had a quick text change to something more speccy appropriate. [IMG]http://img.photobucket.com/albums/v294/yellow_spid…

    ... just changed it to DEC (HL) simply as that seemed to ... :

    DEC A
    JP Z, GAME_OVER

    or ...

    DEC A
    JP Z, REST_IN_PEACE

    [b ...
    Shadow Maker Shadow Maker January 2010 Chit chat
  • Bit functions speedI just stared nonplussed at the documentation for the bit functions. Apparently, if you're using the accumulator, using AND and OR is faster than se…

    ... :

    [code]
    inc hl
    dec bc
    ld ... ,b
    or c
    jp nz, loop
    [/code]

    [code]
    cpi
    jp pe, loop ; or maybe po ...
    Alcoholics Anonymous Alcoholics Anonymous February 2010 Development
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ... cp l
    jp z, .finished
    push hl
    ; get ... l
    jp z, .doneattribs
    ld a, (hl)
    ... /> .eoi
    ld hl, framecounter
    inc (hl)

    ; play ... br /> ld hl, framecounter
    inc (hl)

    pop hl
    pop ...
    Paradigm Shifter Paradigm Shifter February 2010 Games
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ... later ; a = 0

    jp z, .copywholescreen



    .copywholescreen
    ld hl, #a000 ; address of backbuffer
    ; set the attributes
    ld hl, scrattribs
    ld bc, 512 ...
    frobush frobush February 2010 Games
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ... a=0 for later
    jp z, .copywholescreen

    ; just ... cells in copybuffer
    ld hl, copybuff
    ; ld a, (copyptr ...
    frobush frobush February 2010 Games
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ... br />
    [CODE]
    ld hl, copybuff

    .nextbuffentry
    cp l
    jp z, .finished
    ; get ... br /> inc l

    jp .nextbuffentry

    [/CODE]
    ld hl, copybuff
    ld a, (copyptr ...
    The President The President February 2010 Games
  • Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …

    ... hl
    ld h,(hl)
    ld l,a ; hl = root.right
    jp ... bit
    and (hl)
    ld (hl),a
    jp cont
    .encoderight ...
    ld hl,-3
    add hl,de ; hl = parent
    jp encode ; on ...
    Alcoholics Anonymous Alcoholics Anonymous February 2010 Development
<1…17181920212223…34>

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