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<1…23242526272829…34>
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    According to Programming the Z80 RST instructions take 11 T states. 2 T states are added to M1 if /INT is present. Where do you think this is wrong?
    Fraser Fraser 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…

    An unconditional RET takes 10 tstates. Check your source.

    Edit: Read the post, you idiot :) RET != RST.

    [ This Message was edited by: Philip Kendall on 2004-07-30 23:57 ]
    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…

    ... /> According to Programming the Z80 RST instructions take 11 T states ... T states are added. A "RST n" instruction does indeed take ... cycles, the peripheral supplies the "RST n" opcode. This is followed ...
    Alcoholics Anonymous Alcoholics Anonymous 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…

    ... /> As mentioned above, your normal "RST n" has 5 cycles of ... acknowldge, during which time the "RST n" opcode is supplied by ... peripheral to place its vector / RST on the data bus) + 2 ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... Rob Pearmain

    ; char5.asm

    ; This demo shows ...
    robpearmain robpearmain August 2004 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... Rob Pearmain

    ; char7.asm

    ; This demo shows ...
    robpearmain robpearmain August 2004 Development
  • (Not speccy) Networking xp I`m trying ( for two days now! and fed up with it) - to some laptops to my PC. How the hell do you make this work? If anyone wants to help Please s…

    ... control, invoicing, home programmed ceramic calc software, and material database. A ... was a Brongniart`s Formula calc, and an element maker program ... programmed the Brongniart`s Formula calc and element cal software in ...
    Steve(spt) Steve(spt) August 2004 Sinclair Miscellaneous
  • This month's Retro Gamer - Cascade 50 honouredWell, after what seems like no end of Cascade Cassette 50 talk this month at WOS ("50 [I]great[/I] games on one [I]great[/I] cassette"), Retro Gamer …

    ... par as far as programming, asm or basic, aiming to write ...
    Sadako Sadako September 2004 Sinclair Miscellaneous
  • I need ASM for random numberI need to generate a random pair of coardinates in asm so that x=random no between 0 and 31, y=random no between 0 and 23. Any ideas on how to code …

    Hi,

    You could use this one if someone founds out why it returns with a Integer Out of Range error. :(

    [code]

    ORG 32768
    LD HL, (23672)
    LD (_RANDOM_SEED), HL ; Initialize the seed for random ...
    horace horace September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... s1 {
    int a;
    float b;
    };

    struct ...
    Philip Kendall Philip Kendall September 2004 Development
  • Best emulator to use for type-insHi Everyone, I have loads of spectrum basic / mc code I had written when I was at school - some cool stuff, I'd like to type it in (from 4" silver p…

    ... SPIN style) for writing simple asm routines for enhancing your BASIC ...
    Dunny Dunny September 2004 Emulators
  • Best emulator to use for type-insHi Everyone, I have loads of spectrum basic / mc code I had written when I was at school - some cool stuff, I'd like to type it in (from 4" silver p…

    ... SPIN style) for writing simple asm routines for enhancing your BASIC ...
    Arjun Arjun September 2004 Emulators
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... bug or not. The command "RST 38H" is the problem. Simply ... 38, which has the opcode RST 38H, thus making it jump ...
    MadDoc MadDoc September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... &view=auto"]after a RST 38[B]H[/B][/url ...
    Philip Kendall Philip Kendall September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    I think my RST command works OK - its just the address in memory that I jump to is wrong. All I need to know is what is the value of 38H in decimal (and RST 00h, 08h, 10h, 18h, 20h, 28h, 30h).

    :)
    MadDoc MadDoc September 2004 Development
  • Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…

    ... .org/~pak21/spectrum/border48-2.asm"]here[/url] for some code ...
    Philip Kendall Philip Kendall September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... ROM image, there is another RST 38H command - thus setting up ...
    MadDoc MadDoc September 2004 Development
  • 9-Game Set with New ZX SpectrumCan anyone tell me which games were in the 9-Game set that was sold in Europe with the ZX Spectrum 48k. I know there were Psion (Flight Simulation, ?…

    ... /> Chess
    Reversi
    Vu-calc
    ...and one other that ...
    jil jil September 2004 Games
  • Why relativly bad colour on Spec compared to other 8bit?Why relatively bad colour on Spec compared to other 8-bit machines like the Master system or even c64? I understand the 8x8 block that you could hav…

    ... mountain of books on Z80 ASM and I'm scared shitless ...
    Sadako Sadako September 2004 Games
  • 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…

    ... /> NBYTE LD A,(HL)
    RST 16
    LD A,255 ...
    Dr BEEP Dr BEEP September 2004 Development
  • WOS archive on DVD?Hello This question has appeared few times, but I have not found any place to order WOS archive. Is anybody selling the whole arcive on DVD's? Jocu

    ... with the various collections that float around, it's up to ...
    darkman darkman October 2004 Sinclair Miscellaneous
  • making games on a real speccy-------------------------------------------------------------------------------- i have recently bought a speccy on ebay and i want to try to make s…

    ... and coded it in raw asm, you'd not really gain ...
    Dunny Dunny October 2004 Games
  • Zecut0r and ZAFA while ago (about 2 yrs)i took VbSpec and tried to port it to Delphi 6. Althought it was pretty weak, it. Meanwhile DelphiSpec 0.1 appeared and i wa…

    ... ink
    7 paper
    asm ;"asm code"
    ld a,2 ... /> procedure zxbeeper ;"beeper test"
    asm ;"asm code"
    ld hl,1646 ... /> int zxbcol ;
    =zxbcol ;
    asm
    ld a,(zxbcol)
    zecut0r zecut0r October 2004 Emulators
  • is it easy to learn z80 machine codewell is it?

    ... a
    ret z
    rst 16
    inc hl
    Dr BEEP Dr BEEP October 2004 Development
  • is it easy to learn z80 machine codewell is it?

    ... a
    ret z
    rst 16
    inc hl
    Remember, not everyone knows that RST 16 outputs a character etc.
    Marko Marko October 2004 Development
  • is it easy to learn z80 machine codewell is it?

    ... a
    ret z
    rst 16
    inc hl
    Remember, not everyone knows that RST 16 outputs a character etc ... A,20 ; X-coordinate
    RST 16
    LD A,"@" ; ANY ... character allowed
    RST 16

    This ends ...
    Dr BEEP Dr BEEP October 2004 Development
  • is it easy to learn z80 machine codewell is it?

    Hmm, my memory of Speccy ROM routines is hazy, but aren't you supposed to do a stream select before doing any RST 16s?

    [ This Message was edited by: AndyC on 2004-10-27 14:09 ]
    AndyC AndyC October 2004 Development
  • is it easy to learn z80 machine codewell is it?

    ... stream select before doing any RST 16s?

    [ This Message ...
    Dr BEEP Dr BEEP October 2004 Development
<1…23242526272829…34>

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