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  • 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…

    ... getOpcode = true) then counter = cycles(opcode)
    |
    getOpcode = false
    |
    decode opcode/byte (if no operands required ...
    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…

    ... of how long an instruction opcode takes to execute, in relation ... to point to the next opcode, which you fetch and decode ...
    Dunny Dunny 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…

    ... Z80_pc
    |
    Decide which opcode this is
    |
    Get ... for each
    |
    Do Opcode stuff
    |
    Increment TStates ... by X (depends on opcode)
    |
    Return

    Dunny Dunny 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…

    ... byte opcodes. Obviously, if each opcode was only 1 byte long ... has received is the entire opcode or if it is just ... easy, once you know the opcode).

    MadDoc,

    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…

    ... , they mean "get the next opcode and look *that* up in ...
    Dunny Dunny 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…

    Considering that you now have a ROM, you'll need to start emulating some opcodes.

    For extra bonus points, can you tell me what opcode 243 is, and what it does?

    D.
    Dunny Dunny 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…

    ... am trying to emulate the opcode INC BC. Now I know ...
    MadDoc MadDoc September 2004 Development
  • Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…

    ... does the Z80 read the opcode that would have followed the ...
    Philip Kendall Philip Kendall 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…

    ... the time by scheduling fixed-length tasks. You can do a ... 'm doing is scheduling fixed-length tasks in multiples of 224 ...
    Alcoholics Anonymous Alcoholics Anonymous 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…

    ... address 38, which has the opcode RST 38H, thus making it ...
    MadDoc MadDoc September 2004 Development
  • TZX and the ZX81Evenin All. EightyOne is now is a state where I can support a more descriptive tape format. I know how some people have been calling for tzx suppor…

    ... Block

    00 2 Length of following data
    02 ... a 1
    04 2 Length of a Pulse in T ... -States
    06 2 Length of Gap between bits
    MikeW MikeW September 2004 Emulators
  • Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…

    ... it with "SpeechIII", poked the length in(!) and hear only sissing ...
    Alcoholics Anonymous Alcoholics Anonymous October 2004 Development
  • Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…

    ... any position by varying the length of 1 in comparison to ... the length of 0 sent to the ...
    Alcoholics Anonymous Alcoholics Anonymous October 2004 Development
  • sound sample rangesIf 0 is the midpoint for a range such as 127 to -128 then should the value -128 not be used for the sake of symmetry? Is this the way it is done wit…

    ... (at least for an infinite length stream). A constant time algorithm ... as 011111111.

    Average length per byte = ( 255 * 8 + 2 ...
    Philip Kendall Philip Kendall October 2004 Development
  • Interesting Custom LoadersHi everyone, I was just thinking about custom loaders on the spectrum and I thought I'd ask you all what you thought was the best one. I'd have to …

    ... I have to halve are "Length of ZERO Bit Pulse" and ... "Length of ONE Bit Pulse". Is ...
    monty.mole monty.mole October 2004 Sinclair Miscellaneous
  • How do I poke a Spectrum?I've forgotten how to do it. Does anyone remember?

    ... difference?
    [/quote]

    Length, mainly. Rather than a single ...
    Lee Tonks Lee Tonks October 2004 Games
  • You want to read this. Oh yes you do.1) Go to [url="http://www.livepublishing.co.uk/retro/retro9.shtml"]http://www.livepublishing.co.uk/retro/retro9.shtml[/url] 2) Read to the very bott…

    ... suppliment is 30 pages in length. It's even written on ...
    roberthazelby roberthazelby October 2004 Sinclair Miscellaneous
  • Sour Cream and chive DoritosI had a packet of those DORITO's Latinos today (Sour Cream and Chive flavour) at approximately 2PM. It's now 1.02 AM, and they're still repeating on…

    ahem... sheeps foreskin in fact... they go to quite a length sourcing those things, as, after the revolution a lot of sheep became Jewish...

    apperently... you didn`t hear it here
    CKay CKay October 2004 Games
  • Idea for site - High Score ChallengeHi all An idea for the site.. CPC Zone (cpczone.emuunlim.com) has run a sucessful High Score Challenge for the past 12 weeks.. The organiser choo…

    ... . I played these games at length in my youth and there ...
    biolaboy biolaboy October 2004 Games
  • Compressed Loading ScreensHi everybody From my speccy memories I could swear I could remember games with loading screens that took less than normal time to load. But up until…

    ... described is known as Run Length Encoding (RLE); how the zip ...
    Philip Kendall Philip Kendall November 2004 Sinclair Miscellaneous
  • Desert Island Spec-GamesOkay, something like this has I'm sure been done before, but what the hell. It's quiet round here. Chose five games to take on your desert island wi…

    ... , only one was played at length.

    5.Mercenary..I ...
    Starglider Starglider November 2004 Games
  • Reading the keyboardDoes anyone have a code sample to read the keyboard in machine code ?

    ... />
    ld a,(count) ; increase length of time key has been ...
    ld l,a ; l = length of time key has been ... ,(state)
    call SPtbllookup ; a = length of time key needs to ...
    Alcoholics Anonymous Alcoholics Anonymous November 2004 Development
  • How to hack game to find pokes for infinity life and others!Hello! Maybe this has been discused before, but I coulden't find anything via search. My question is this. How do you find the pokes for infinity …

    ... will stop on the exact opcode for you ;)
    Woody Woody November 2004 Games
  • What are the advantages of PASMO over TASMJust wondering, what can't TASM do that PASMO can etc etc. (Just edited this, found the --tapbas option, awesome) [ This Message was edited by: rob…

    Sorry, I've not previously seen this last post.

    Pasmo has no limit in identifier's length other than available memory.
    NotFound NotFound November 2004 Development
  • There's a bug in my Speccy, Dear Liza, Dear Liza...Hi guys, Just me being annoying again - Can anyone out there in 'Internetland' help me with ideas about what could be causing a bug in my Speccy em…

    ... at least compare how your opcode handlers work as opposed to ...
    Dunny Dunny December 2004 Development
  • There's a bug in my Speccy, Dear Liza, Dear Liza...Hi guys, Just me being annoying again - Can anyone out there in 'Internetland' help me with ideas about what could be causing a bug in my Speccy em…

    ... test for every single Z80 opcode, with the correct[1] output ...
    Philip Kendall Philip Kendall December 2004 Development
  • There's a bug in my Speccy, Dear Liza, Dear Liza...Hi guys, Just me being annoying again - Can anyone out there in 'Internetland' help me with ideas about what could be causing a bug in my Speccy em…

    ... the file with a zero-length version! :mad: :o

    robert@fm robert@fm December 2004 Development
  • Retro Gamer and Trashman Retro Gamer issue 11 hits the shelves around 19th December. Speccy fans will love the Trashman 20th anniversary feature which includes an interview …

    Hi Rach,

    The article has, I am told, been 'edited for length', but I am assurred that the ol' man survived intact :)

    Ask away with the favour, I'll drop you an email


    Craig
    cately999 cately999 December 2004 Sinclair Miscellaneous
<1…18192021222324…34>

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