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<1…20212223242526…34>
  • Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…

    ... address of the next instruction), SP (the 16 bit register pointing ...
    Alcoholics Anonymous Alcoholics Anonymous 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 (pdsp_+1),sp
    ld sp,ix
    ld h ...
    pdsp_
    ld sp,03131h
    pd_fin:
    ld ... a
    add hl,sp
    ld sp,hl
    ld ... /> ld sp,NT_
    add hl,sp
    ld sp,hl
    ld (psp_+1),sp
    ld sp,hl
    pop ...
    chev chev November 2009 Development
  • SP and IM2 woesI have a function that writes the backbuffer to the screen using the method by which SP is stored, I "POP" a load of registers and then chnge SP to t…

    I didn't know that, that explains everyting.

    I will look into

    a) Breaking halfway through (Good thinking)
    b) Changing the function to not us SP (I only use it to set up the LDI values)

    THanks
    robpearmain robpearmain November 2009 Development
  • 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…

    ... [CODE]paranoid_nop_backs exx ;HL' = SP
    ld sp,nop_back_table ;Table start
    ld sp,hl ;Restore SP
    ret ;Done[/ ...
    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…

    ... /> [CODE]paranoid_nop_backs exx ;HL' = SP
    ld sp,nop_back_table ;Table start etc ...
    Geoff Geoff 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…

    ... [CODE]paranoid_nop_backs exx ;HL' = SP
    ld sp,nop_back_table ;Table start
    ld sp,hl ;Restore SP
    ret ;Done[/ ...
    Retrobrothers Retrobrothers November 2009 Games
  • make up some stupid game names?Just for a joke really, since certain people on an auction site can't be ars... errm bothered to list their games.. I thought I'd ask if they had..h…

    ... Museum
    Mickey's Monkey Sp*nk Moped

    (and ...
    festershinetop festershinetop November 2009 Chit chat
  • 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…

    ... /> (S: '(HL)'; I: 140), (S: '(SP)'; I: 141),
    (S: '.IF ... : 'SLL'; I: 152),
    (S: 'SP'; I: 110), (S: 'SR'; 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…

    ... /> (S: '(HL)'; I: 140), (S: '(SP)'; I: 141),
    (S: '.IF ... : 'SLL'; I: 152),
    (S: 'SP'; I: 110), (S: 'SR'; 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…

    ... /> ld (pdsp_+1),sp
    ld sp,ix
    ld h ...
    pdsp_
    ld sp,03131h
    pd_fin:
    ld ... a
    add hl,sp
    ld sp,hl
    ld ... /> ld sp,NT_
    add hl,sp
    ld sp,hl
    ld (psp_+1),sp
    ld sp,hl
    pop ...
    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…

    And we still have
    EX DE,HL
    EX (SP),HL

    Always nice to use....
    Dr BEEP Dr BEEP December 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…

    ... think I've used EX (SP),HL yet though. If it ... was EX SP,HL I might have some ...
    joefish joefish December 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…

    ... what the point of EX (SP),HL was - until I started ... , then finish off with EX (SP),HL to pick up the ...
    gasman gasman December 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…

    ... be intimately familiar with EX (SP), HL :-)

    Also I ... , and swap them with EX (SP), HL.
    Winston Winston December 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…

    ... what the point of EX (SP),HL was - until I started ... , then finish off with EX (SP),HL to pick up the ...
    joefish joefish December 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…

    ... what the point of EX (SP),HL was ...[/QUOTE]

    [code]
    .PrText
    EX (SP),HL
    .PrTextLp
    LD ... PrTextLp
    .PrTextEnd
    EX (SP),HL
    RET

    Jonathan Harston Jonathan Harston December 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…

    ...
    ;
    pop hl ; manipulate sp to handle paging errors
    ;
    main1 ld (err_sp),sp
    ; push hl ; preserve hook31 ...
    jp jp December 2009 Development
  • Who remembers Mr Noseybonk?Be afraid, be very afraid! [URL="http://www.youtube.com/watch?v=a5_rRsaTY2A"]Cake![/URL]

    ... /> Noseybonk was infact Adrien Hedley (sp) in a mask, but he ...
    SKR SKR December 2009 Chit chat
  • Who remembers Mr Noseybonk?Be afraid, be very afraid! [URL="http://www.youtube.com/watch?v=a5_rRsaTY2A"]Cake![/URL]

    ... ]Noseybonk was infact Adrien Hedley (sp) in a mask, but he ...
    frobush frobush December 2009 Chit chat
  • 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…

    ... ------- z80 stack (512 bytes) set SP=d000
    [/code]

    SP appropriately). The location of the ...
    Alcoholics Anonymous Alcoholics Anonymous 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…

    ... returns the stack (value in SP) will point at the same ...
    Alcoholics Anonymous Alcoholics Anonymous December 2009 Development
  • Ich suche zum Interviewen...einen Deutschen oder eine Deutsche, der/die sich noch an der Zeit bevor der Wende erinnert. Ich moechte Euch ueber die Kulturelle Auswirkungen der Te…

    ... zwei L?nder?

    Sp?ter: Einige Fragen ?ber die ...
    wilsonsamm wilsonsamm December 2009 Chit chat
  • Ich suche zum Interviewen...einen Deutschen oder eine Deutsche, der/die sich noch an der Zeit bevor der Wende erinnert. Ich moechte Euch ueber die Kulturelle Auswirkungen der Te…

    ... stattdessen aus dem Gebiet der sp?teren DDR gemacht h?tte ... eine gro?e Euphorie zu sp?ren und die Zusammenf?gung ... zu schauen ;)

    [b]Sp?ter: Einige Fragen ?ber die ...
    XTM of TMG XTM of TMG December 2009 Chit chat
  • Looking for 'speech' games - Cheetah.I've just recently hooked up a Cheetah Sweet Talker and a Currah Microspeech to one one my rubber-keyed chums. He's quite a lil chatter-box, so now'…

    ... Fuller Orator all used the SP-0256 chip - I'm not ...
    gasman gasman December 2009 Games
  • Ich suche zum Interviewen...einen Deutschen oder eine Deutsche, der/die sich noch an der Zeit bevor der Wende erinnert. Ich moechte Euch ueber die Kulturelle Auswirkungen der Te…

    ... of TMG;406626]
    [b]Sp?ter: Einige Fragen ?ber die ...
    wilsonsamm wilsonsamm December 2009 Chit chat
  • Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…

    ... /> di
    ld (stack+1), sp ;preserve stack pointer
    ld ... sp, $d0f0 ;address table
    ld ... , again
    stack ld sp, $0000 ;recover sp
    ei
    ret ...
    Bandit Bandit December 2009 Development
  • Converting games from tap to dskHi to all from Greece, Being an old Speccy user and now owner of most models of Spectrum (48k , 48k+ , 128K, +2 grey and +3) , I desided to salvage m…

    ... /> LD (HL), $51
    LD SP, HL
    LD BC, $7FFD ...
    FrankT FrankT January 2010 Emulators
  • Converting games from tap to dskHi to all from Greece, Being an old Speccy user and now owner of most models of Spectrum (48k , 48k+ , 128K, +2 grey and +3) , I desided to salvage m…

    ... 36608 then note down PC, SP, interrupt state then poke the ...
    nuggetreggae nuggetreggae January 2010 Emulators
  • more memoryi dunno if this has been mentioned, apologies if it has (i cant be arsed to search :P) Ive just been reading about the zx81 and it popped into my he…

    ... PLUS, ZX MMC, ZX ATA SP.....)
    Or this my upgrade ...
    velesoft velesoft January 2010 Hardware
<1…20212223242526…34>

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