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<1234567…34>
  • Suggestion for EmulatorsHi, Could I make a suggestion as to a feature to be included in future emulator updates. Not so much an emulator feature, rather a feature of the b…

    ... based or don't assemble undocumented instructions.

    Derek
    dmsmith dmsmith July 2005 Emulators
  • Assembler Interest?Any interest in an assembler supporting ACS's UV? I've built an assembler that: supports UV's syntax. has more correct parsing. Microdrive based…

    ... /> non forward public references.
    undocumented instructions.

    Not only does ... testing is still required for undocumented instruction support.
    I'm ...
    JHutcheson JHutcheson August 2005 Announcements
  • New Spectrum emulator for DS[url]http://zxds.raxoft.cz/[/url] [quote]Features already implemented: * Solid Z80 core - possible bugs aside, the Z80 emulation is as complete…

    ... includes all documented and undocumented instructions, each modifying the documented ... and undocumented flags as it ... undocumented BIT N,(HL),R and BIT N,(XY+D),R instructions ... which should modify the undocumented flags ...
    StuBruise StuBruise March 2007 Emulators
  • JSpeccy: New emulatorHi there, Jos? Luis S?nchez (zx81 at ono dot com) has developed a new ZX Spectrum emulator in Java, with a very accurate Z80 emulation. The message …

    ... of the Z80, including the undocumented instructions and flags
    - Accurate execution ...
    jpablo jpablo March 2010 Emulators
  • z88dk SP1 - any internal oddities?I'm just wondering if anyone knows if the Z88DK's spritelib SP1 has any oddities inside, for instance relying on specific timings, undocumented instr…

    ... instance relying on specific timings, undocumented instructions, or anything of that kind ... />
    Finally, is there an undocumented instruction test program floating around ...
    Winston Winston July 2012 Development
  • Interview with Zilog FoundersIt's almost eight years old now so maybe this has done the rounds once already, but in case you missed it: [url]http://archive.computerhistory.org/r…

    ... 's the proof that those undocumented instructions are 'safe' (or rather more ... 'safe' than other undocumented instructions). They don't mention it ... index register stuff which was undocumented) but they had the original ...
    Alcoholics Anonymous Alcoholics Anonymous April 2014 Sinclair Miscellaneous
  • IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…

    I don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are perfectly safe to use on any Spectrum model or clone.

    Is that right?
    R-Tape R-Tape August 2016 Development
  • Is it possible to make the Z80 execute a bizarre instruction?What happens when it gets an unrecognised instruction OP Code, I mean something following a #ED that isn't one of the undocumented instructions eithe…

    ... isn't one of the undocumented instructions either? Does it just pass ...
    dmsmith dmsmith March 2022 Development
  • Z80 AssemblerSome of you may know that I'm working on a Z80 assembler. I thought I'd start a thread so I can see what people think and what they might want to see…

    ... /> Are you gonna include the undocumented instructions? Hopefully yes!
    Symbol Table ...
    rich_chandler rich_chandler February 2003 Sinclair Miscellaneous
  • Z80 AssemblerSome of you may know that I'm working on a Z80 assembler. I thought I'd start a thread so I can see what people think and what they might want to see…

    ... and linker. Operands used in instructions are treated as expressions and ... ]Are you gonna include the undocumented instructions? Hopefully yes![/quote]

    instructions per the rules for doing ...
    cyborg cyborg February 2003 Sinclair Miscellaneous
  • AssemblersProbably asked a question that's been asked a million times before... but... I've decided to do a bit of old Speccy machine coding again, after 20 y…

    ... information or support for all undocumented instructions which mine has.
    Fraser Fraser August 2003 Development
  • ANN: Spectaculator 6.2[NEW]: Spectaculator 6.2 Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows 95, 98, ME, NT 4, 2000 and XP. Spectaculator emul…

    ... some of the more esoteric undocumented instructions that I don't emulate ...
    Jon Needle Jon Needle May 2004 Emulators
  • Suggestion for EmulatorsHi, Could I make a suggestion as to a feature to be included in future emulator updates. Not so much an emulator feature, rather a feature of the b…

    ... .

    Does it assemble undocumented instructions?
    dmsmith dmsmith July 2005 Emulators
  • Suggestion for EmulatorsHi, Could I make a suggestion as to a feature to be included in future emulator updates. Not so much an emulator feature, rather a feature of the b…

    [quote]
    On 2005-07-20 03:09, dmsmith wrote:

    Does it assemble undocumented instructions?
    [/quote]

    Yes :)

    Marko
    Marko Marko July 2005 Emulators
  • Suggestion for EmulatorsHi, Could I make a suggestion as to a feature to be included in future emulator updates. Not so much an emulator feature, rather a feature of the b…

    ... based or don't assemble undocumented instructions.
    [/quote]

    [url ... not DOS based and assembles undocumented instructions.
    Philip Kendall Philip Kendall July 2005 Emulators
  • Z80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek

    Nope.

    A big document about the undocumented instructions in the Z80, which seems quite extensive - [url="http://www.geocities.com/SiliconValley/Peaks/3938/z80undoc.htm"]http://www.geocities.com/SiliconValley/Peaks/3938/z80undoc.htm[/url]
    Quazar Quazar July 2005 Development
  • Z80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek

    ... map that includes all the undocumented instructions.

    For ... map that shows which undocumented z80 instructions became documented, which have ... been replaced by new instructions and which have been ... the z380 has more instructions on offer than the ...
    Alcoholics Anonymous Alcoholics Anonymous August 2005 Development
  • Z80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek

    ... /> [/quote]

    They remain undocumented until Zilog documents them. Before ... /> A major opportunity to kill undocumented instructions happened when the z80 went ... layouts and on these those undocumented instructions are unlikely to work. These ...
    Alcoholics Anonymous Alcoholics Anonymous August 2005 Development
  • Z80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek

    ... map that includes all the undocumented instructions.
    [/quote]
    Quite a ... think the z380 has more instructions on offer than the ez80 ...
    Jonathan Harston Jonathan Harston August 2005 Development
  • EmuZwin27How does this thing work? I can't get it to load anything at all. All I can get it to do is show me loading screens and nothing else :confused: I'm p…

    ... /> [-] Core emulation fixed for all undocumented instructions (including BIT n,(HL)). Now ...
    Vladimir Kladov Vladimir Kladov March 2006 Emulators
  • The 150 pound home computerWe missing out on this still ... I think. I know the PC market has wrecked all chance for any alternatives to ever have a hope but ... what if. :lol:…

    ... register pairs and to force instructions to use short addressing but ... . Compatibility is high except for undocumented instructions. I think it traps them ... with some of the new instructions either way.

    If ...
    JamesD JamesD February 2007 Sinclair Miscellaneous
  • The 150 pound home computerWe missing out on this still ... I think. I know the PC market has wrecked all chance for any alternatives to ever have a hope but ... what if. :lol:…

    ... * because there are new instructions, the weirdo undocumented instructions won't work and ... neither will some freaky undocumented ... flag behaviour, and many normal z80 instructions have ...
    Alcoholics Anonymous Alcoholics Anonymous February 2007 Sinclair Miscellaneous
  • The 150 pound home computerWe missing out on this still ... I think. I know the PC market has wrecked all chance for any alternatives to ever have a hope but ... what if. :lol:…

    ... ]* because there are new instructions, the weirdo undocumented instructions won't work and ... neither will some freaky undocumented flag ... 24 bit address range or undocumented instructions. The question is, how ...
    JamesD JamesD February 2007 Sinclair Miscellaneous
  • The 150 pound home computerWe missing out on this still ... I think. I know the PC market has wrecked all chance for any alternatives to ever have a hope but ... what if. :lol:…

    ...
    The most important undocumented instructions -- those having to do with ... t be because new instructions fill in some of ... software means getting the undocumented flag behaviour correct and ... changes with the sequence of instructions executed.

    ...
    Alcoholics Anonymous Alcoholics Anonymous February 2007 Sinclair Miscellaneous
  • Sound / Kempston EmulationHi I'm working on a spectrum emulator and I need som help. i still have loads left with the Z80 (not fully implemented yet) but I'm trying to get a h…

    ... , *happy* I still have som undocumented instructions left to implement.
    I ... there any complete list of instructions that also contans tstates?
    instructions.

    Cheers
    /Jimmy
    Jmc Jmc March 2007 Emulators
  • Assembly Instructions Help ListThere must be a list of instructions, what they stand for and what they do online somewhere, but I can't seem to find one. Does anybody know of one?

    Also, if you want the complete manual, check out the Z80 User Guide (available at z80.info as well as zilog.com). It's a huge PDF with everything you wanted to know about the Z80 and were afraid to ask. (Well, except undocumented instructions!)
    Winston Winston May 2007 Development
  • He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…

    ... />
    and look at the undocumented instructions. These also need to be ...
    Winston Winston September 2007 Chit chat
  • Z80 CPUs goin cheap.This guy is selling them very cheaply and has a couple multi item auctions for them. Thought I would post here in case people were looking for one/so…

    ... issues. Maybe the illegal (or undocumented) opcodes don't work as ... still produced chips support the undocumented instructions?
    DEATH DEATH October 2007 Sales
  • Z80 CPUs goin cheap.This guy is selling them very cheaply and has a couple multi item auctions for them. Thought I would post here in case people were looking for one/so…

    ... issues. Maybe the illegal (or undocumented) opcodes don't work as ... still produced chips support the undocumented instructions?[/QUOTE]

    I meant ...
    +2MAN +2MAN October 2007 Sales
<1234567…34>

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