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<1…22232425262728…34>
  • Pac-Man EmulatorMy Pac-Man Emulator for the Spectrum +2A/+3 is now available for download from: [url]http://simonowen.com/spectrum/pacemuzx/[/url] You'll need to su…

    ... ]I managed to save enough cycles in the colour version to ...
    Pegaz Pegaz December 2011 Brand new software
  • Games that never end...?I'm not talking about games that loop back to the start once you get to a certain point, but games that cannot be 'completed' [url=http://www.worldo…

    ... that be level 256 that cycles back to 1 (or zero ...
    R-Tape R-Tape December 2011 Games
  • Writing an emulator - how to / resourcesI'm looking for a holidays project, and I'm thinking I'd like to write a simple Spectrum emulator. I've googled plenty and read some resources, but …

    ... necessary to care about machine cycles, i.e. about exact time ...
    Shiru Shiru December 2011 Emulators
  • Spectrum+ Keyboard problemI got a ZX Spectrum+ recently. This thing is never used and is in excellent condition. The previous owner told me he never used it and stored it in h…

    ... had thousands of heating/cooling cycles too so it's not ...
    guesser guesser December 2011 Sinclair Basic
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... (they take an extra four cycles though, equivalent to a NOP ...
    joefish joefish January 2012 Development
  • Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…

    Actually, you can't change the border colour more frequently than once in any four CPU cycles (ie only once every eight border 'pixels'). Besides, you can't do the OUTs fast enough ;-)
    csmith csmith January 2012 Games
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... (they take an extra four cycles though, equivalent to a NOP ...
    apenao apenao January 2012 Development
  • Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…

    ... once in any four CPU cycles (ie only once every eight ... 'once in any four CPU cycles' restriction doesn't apply on ...
    gasman gasman January 2012 Games
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... amounts to many wasted cpu cycles.

    3. Display addresses ... address and you need cpu cycles to compute the next screen ... means there are no wasted cycles in a HALT, eg, waiting ...
    Alcoholics Anonymous Alcoholics Anonymous January 2012 Development
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... amounts to many wasted cpu cycles.

    3. Display addresses ... address and you need cpu cycles to compute the next screen ... means there are no wasted cycles in a HALT, eg, waiting ...
    climacus climacus January 2012 Development
  • PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…

    ... taking 3 bytes and 10 cycles and the latter taking 4 ... bytes and 14 cycles). Conceptually, the z80 sticks H ...
    Alcoholics Anonymous Alcoholics Anonymous January 2012 Development
  • Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…

    ... copied in between screen refresh cycles, so that each segment will ...
    Battle Bunny Battle Bunny January 2012 Sinclair Miscellaneous
  • Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…

    ... two writes separated by 16 cycles. Maybe the writes in push ...
    Alcoholics Anonymous Alcoholics Anonymous January 2012 Sinclair Miscellaneous
  • Loading the display with data from memoryTrying to load part of the screen(4k's worth) with data from memory location 53000, I've written this routine, but it doesnt work... [I]ld b,4000 ld…

    ...
    Taking account to the cycles in above code:

    -snipet 1: 133 cycles for 10 bytes= 13.3 ... /> -snipet 2: 91 cycles for 6 bytes= 15.16 ... be about 13.5 cycles per byte. This works ...
    Because it's 8 cycles aligned if there's contention ...
    antoniovillena antoniovillena January 2012 Development
  • Faster CLS...Hi Folks, Looking at the CLS command in the Spectrum ROM disassembly it seems rather complex. Does anyone know of a simpler/quicker routine that wi…

    ... out, weighing in at 0 cycles :)
    sack sack January 2012 Sinclair Basic
  • Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…

    ... by throwing away a few cycles with deliberately odd-numbered timed ... wait the necessary amount of cycles to make the interrupt occur ...
    Patrik Rak Patrik Rak January 2012 Games
  • What's on your saucer?Thanks go out to frobush and zx1 for inspiring* this WoSser to create a yet another excellent WoS thread. Lunch 10 minutes ago. [IMG]http://i300.ph…

    ... ]

    How many regurgatative cycles has that been though?
    R-Tape R-Tape January 2012 Chit chat
  • What's on your saucer?Thanks go out to frobush and zx1 for inspiring* this WoSser to create a yet another excellent WoS thread. Lunch 10 minutes ago. [IMG]http://i300.ph…

    ... -Tape;598800]How many regurgatative cycles has that been though?[/QUOTE ...
    ZnorXman ZnorXman January 2012 Chit chat
  • Disable interrupts?Well, I've read the bits from the David Webb book about interrupt modes and (vaguely) appreciate the principles behind having a vector table, after r…

    ... ( gutz ), where you wait X cycles, or do various CONSTANT time ...
    Baggers Baggers February 2012 Development
  • Commodore 64 - First time trying - REVIEW & Pictures!Right, so the 2nd hand shop was selling this Commodore and accessories. So I decided to buy it, as I've never had a Commodore and this is my first ti…

    ... access the RAM on alternate cycles so there's no memory ... of its meagre allotment of cycles when colour and sprite data ...
    Matt_B Matt_B February 2012 Sinclair Miscellaneous
  • SIDBlaster/ZX - new soundcard for ZX-SpectrumThis soundcard is for ZX-Spectrum compatible computers. It uses in its work MOS Technology SID soundchip, which together with MOS Technology 6510 mic…

    ... runs for a few hundred cycles every 1/50th second to ...
    mcleod_ideafix mcleod_ideafix February 2012 Announcements
  • SIDBlaster/ZX - new soundcard for ZX-SpectrumThis soundcard is for ZX-Spectrum compatible computers. It uses in its work MOS Technology SID soundchip, which together with MOS Technology 6510 mic…

    ... runs for a few hundred cycles every 1/50th second to ...
    BYTEMAN BYTEMAN February 2012 Announcements
  • Z80 instructions tableI could never find a complete z80 instructions table (including timings) that I really liked. All reference material I have is either incomplete, or …

    ... , "ld h,a" takes 4 cycles and "ld ixh,a" takes ...
    Alcoholics Anonymous Alcoholics Anonymous February 2012 Development
  • Z80 instructions tableI could never find a complete z80 instructions table (including timings) that I really liked. All reference material I have is either incomplete, or …

    ... , "ld h,a" takes 4 cycles and "ld ixh,a" takes ... 4+4=8 cycles not 9.[/QUOTE]

    Einar Saukas Einar Saukas February 2012 Development
  • Precisely timed loops in assemblyI'm looking for a way to make my code stop until the raster has reached the lower screen border (right after having drawn the last pixel line). I und…

    ... the specified amount of T cycles, the way of measuring the ...
    Patrik Rak Patrik Rak February 2012 Development
  • Precisely timed loops in assemblyI'm looking for a way to make my code stop until the raster has reached the lower screen border (right after having drawn the last pixel line). I und…

    ... need to start counting instruction cycles for the complex stuff (like ...
    gasman gasman February 2012 Development
  • Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…

    ... that takes a lot of cycles even in the best case ...
    AndyC AndyC February 2012 Sinclair Miscellaneous
  • Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…

    ... that takes a lot of cycles even in the best case ...
    jesus 666 jesus 666 February 2012 Sinclair Miscellaneous
  • Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…

    ... the player sprite, or wasting cycles changing data around

    jesus 666 jesus 666 February 2012 Sinclair Miscellaneous
  • The Sinclair ZX Microdrive Resurrection Project (long)Dear Spectrum fans! [Management summary: Download [url]http://www.bartheld.net/temp/mdv2img.zip[/url] and tell me what you think. All help very much…

    ... (idle spinning or start/stop-cycles)? When I was anticipating mdv2img ...
    Volker Volker March 2012 Emulators
<1…22232425262728…34>

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