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<1…18192021222324…34>
  • T.I.M. - A New Interlace - Demo for DOWNLOADHere's something that's been in the works for quite a while ( mostly in my head ) and recently I've aquired assistance to help it come to fruition. …

    ...
    pop af
    pop bc
    pop de
    pop ... hl
    exx
    pop bc
    pop de
    pop ...
    push de
    push bc
    exx
    push hl ...
    push de
    push bc
    push af

    Alcoholics Anonymous Alcoholics Anonymous April 2004 Development
  • T.I.M. - A New Interlace - Demo for DOWNLOADHere's something that's been in the works for quite a while ( mostly in my head ) and recently I've aquired assistance to help it come to fruition. …

    ...
    pop af
    pop bc
    pop de
    pop ... hl
    exx
    pop bc
    pop de
    pop ...
    push de
    push bc
    push af
    exx ...
    push de
    push bc

    ;repeat x16
    gasman gasman April 2004 Development
  • Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…

    ... /> [code]
    out (c), d ; bc = 0xfffd, d = 8
    exx ...
    out (c), d ; bc' = 0xbffd, d' = volume A
    gasman gasman April 2004 Sinclair Miscellaneous
  • Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…

    ... c,a
    add ix,bc ; add sample value to total ... bit integer
    adc hl,bc ; add byte displacement
    ; to ...
    Alcoholics Anonymous Alcoholics Anonymous April 2004 Sinclair Miscellaneous
  • Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…

    ... ,0x5678

    ld bc,sample_skip ; bc = how many 256ths of samples ... skip

    add hl,bc
    ld (sample_pos_lo+1),hl ... address
    ld bc,0
    adc hl,bc ; carry to high ... into A, then...
    ; ld bc,32765
    ; out (c),a ...
    gasman gasman April 2004 Sinclair Miscellaneous
  • Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…

    ... br /> ; do memory paging here, bc is available
    ; sample must ... to sample
    ld a,(bc) ; 6 bit sample
    ld bc,endadder
    sbc hl,bc
    jr ... ; 100 -- output to AY
    ; bc' = $fffd
    ; de' = $0809 ...
    Alcoholics Anonymous Alcoholics Anonymous April 2004 Sinclair Miscellaneous
  • Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…

    ... /> ; do memory paging here, bc is available
    ; sample must ... address
    ptr:
    ld bc,ptr

    ; ... adds 119 cycles
    dec bc
    jr done ; adds ... ; 110 -- output to AY
    ; bc' = $fffd
    ; de' = ...
    Alcoholics Anonymous Alcoholics Anonymous April 2004 Sinclair Miscellaneous
  • simple z80 rom for test my emulatorHi there! Does anyone here have a very simple rom(in Z80 format) for testing my emulator. I need a very simple one that implements few opcodes and po…

    ... DE,4000
    0006 LD BC,1B00
    0009 LDIR
    Philip Kendall Philip Kendall April 2004 Emulators
  • Does Screen Flipping work on a 48k Spectrum?On the other post it showed some basic code to flip the screen on a +3. Does it work on a 48k Spectrum. Can anyone show me the machine code to: Se…

    ... ,49152 'start backupscreen
    LD BC,6912 'length of screen
    Dr BEEP Dr BEEP May 2004 Development
  • VSYNC FunctionI have written a VSYNC function, so that I can clear the screen before redraw without flicker on the screen, I do this by peeking at the address 2367…

    ...
    ld c,e ; ld bc,257
    ldir

    gasman gasman May 2004 Development
  • 16k/48k Sound FXI am now moving on from graphiocs to trying to build up a library of sound fx to be used with a 16k/48k Spectrum. Does anyone have any example m/cod…

    ...


    ZAP1: LD BC,180
    LD HL,10 ... A,10
    ZAP4: PUSH BC
    PUSH DE
    PUSH ... /> POP DE
    POP BC
    ADD HL,BC
    ;change frequency ...
    robpearmain robpearmain May 2004 Development
  • 16k/48k Sound FXI am now moving on from graphiocs to trying to build up a library of sound fx to be used with a 16k/48k Spectrum. Does anyone have any example m/cod…

    ... b,32
    noise0 push bc
    ld a,(hl) ; next ... /> jr nz,noise1
    pop bc
    djnz noise0
    pop ...
    robpearmain robpearmain May 2004 Development
  • 16k/48k Sound FXI am now moving on from graphiocs to trying to build up a library of sound fx to be used with a 16k/48k Spectrum. Does anyone have any example m/cod…

    ... of repeats)
    start: push bc
    WhiteNoise: ld b,0 ... noise1


    pop bc
    djnz start
    ret ...
    robpearmain robpearmain May 2004 Development
  • SpecEmu 2.1 betaFinally I think I've cracked all the gory contention details required by those trendy multicolour demos (48K/128K modes only, +3 contention can wait …

    ... instruction (out (C),A), when BC=7FFD. If an instruction itself ...
    Vladimir Kladov Vladimir Kladov May 2004 Emulators
  • T.I.M. - A New Interlace - Demo for DOWNLOADHere's something that's been in the works for quite a while ( mostly in my head ) and recently I've aquired assistance to help it come to fruition. …

    ... '
    POP DE
    POP BC
    EXX
    POP AF ...
    POP DE
    POP BC
    POP IX
    POP ...
    PUSH IX
    PUSH BC
    PUSH DE
    PUSH ... H
    EXX
    PUSH BC
    PUSH DE
    PUSH ...
    Fikee Fikee May 2004 Development
  • An intriguing question...Well, intriguing for me anyway. As we all know, when calling a Machine Code function from BASIC, we use the USR (address) function. But for this to …

    ... the return value of the BC registers.

    PRINT USR ...
    Steve(spt) Steve(spt) June 2004 Development
  • An intriguing question...Well, intriguing for me anyway. As we all know, when calling a Machine Code function from BASIC, we use the USR (address) function. But for this to …

    ... function returns whatever is in BC upon returning from the call ...
    gasman gasman June 2004 Development
  • An intriguing question...Well, intriguing for me anyway. As we all know, when calling a Machine Code function from BASIC, we use the USR (address) function. But for this to …

    ... give back the value of BC, but the call from basic ... SEED with the value from BC, to be used with the ...
    Dr BEEP Dr BEEP June 2004 Development
  • Spectrum Only GamesHiyas peeps. Has anyone out there got a list of 'spectrum only' games? As in, games that were only ever brought out on the spectrum, not cross plat…

    ... "Leggit" (Imagine also did Pedro, BC Bill and Cosmic Cruiser for ...
    jil jil July 2004 Games
  • Z80 processor question...Suppose we fill the entire $0000-$ffff memory range with $ed. What will the processor do ? I suppose it will get locked, but will it still respond to…

    ... there is no SBC IX,[BC|DE|IX|SP] instruction
    JHutcheson JHutcheson July 2004 Development
  • MC 101Hello Group Members: Can't spectrum MC be embedded in a BASIC program

    ... of repeats)
    start: push bc
    WhiteNoise: ld b,0 ...
    djnz noise1
    pop bc
    djnz start
    ret ...
    dalmudlee dalmudlee 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…

    ... tstates: acknowledge the interrupt and decrement SP.
    * M2: ... 7 tstates: acknowledge interrupt and decrement SP.
    * M2: 3 ... 6 tstates: acknowledge interrupt and decrement SP.
    * M2: 3 ... tstates: acknowledge the NMI and decrement SP.
    * M2: ...
    Fraser Fraser July 2004 Development
  • Z80 core testing ?OK, my z80 core is almost finished (apart from RRD, RLD, and block instructions except LDI,LDIR,LDD,LDDR). I run the 48K rom and hurray, it resets co…

    ... /> ---------

    AF BC DE HL AF' BC' DE' HL' IX IY ... /> After that, lines specifying AF, BC etc as for .in files ...
    Philip Kendall Philip Kendall 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…

    ... : 6 tstates: acknowledge interrupt and decrement SP.
    * M2: 3 tstates ... : write high byte and decrement SP.
    * M3: 3 tstates ... high byte of 'nnnn' and decrement SP.
    * M4: 3 tstates ... PC to the stack and decrement SP.
    * M5: 3 tstates ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…

    [code]ld bc,0x7ffd
    out (c),[/code]
    Philip Kendall Philip Kendall August 2004 Development
  • Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…

    ... check against
    CDLOOP PUSH BC
    LD (HL),0 ;Reset ... /> POP DE

    POP BC
    DJNZ CDLOOP ;Loop back ... /> RET

    RETURN POP BC
    LD A,9 ;9 ...
    dmsmith dmsmith August 2004 Development
  • Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …

    ... B,0
    ADD HL,BC
    LD A,(HL) ; get ...
    Dr BEEP Dr BEEP August 2004 Development
  • Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …

    ... /> (Juggle registers as appropriate if BC isn't a very helpful ...
    gasman gasman August 2004 Development
  • need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …

    I've replaced all of those push-pop BC with saving into IXh. Haven't found a place where to use it in more effective way though, so perfomance didnt improve dramatically:), may be about 15-25 tacts for each line.
    moroz1999 moroz1999 August 2004 Development
<1…18192021222324…34>

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