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<1234567…34>
  • Question on 8-bit, 16-bit, 32-bit...Hello, Sorry, this is probably a really dumb question(and something I should know by now :)). I tried doing some searches about this but came up only…

    ... it's a bit different decoding opcodes then you describe because the ... is a CISC chip the opcodes aren't of standard size ... can't be sure how opcodes are actually organised). The extra ...
    cyborg cyborg January 2003 Sinclair Miscellaneous
  • "Decoding Z80 Opcodes" updateHello, To whom it may concern: I've made an update to my document, "Decoding Z80 Opcodes" at [URL="http://www.z80.info/decoding.htm"]http://www.z80.…

    Hello,

    To whom it may concern: I've made an update to my document, "Decoding Z80 Opcodes" at [URL="http://www.z80.info/decoding.htm"]http://www.z80.info/decoding.htm[/URL]. Thanks to BlueChip for his suggestions and corrections.
    GOC GOC August 2006 Announcements
  • Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…

    ... /> [url="http://www.z80.info/decoding.htm"]http://www.z80.info ... /decoding.htm[/url]

    I' ... running in to a problem decoding the following:

    DDCB ... the section titled "DD-Prefixed OpCodes" it seems the example is ...
    vreddy vreddy December 2004 Development
  • "Decoding z80 Opcodes" (http://www.z80.info/decoding.htm#intro) - Incorrect HALT Opcode?Apologies if this is a dupe but I searched within the forums and couldn't find anything. I've been working on a z80 emulator (for academic and rec…

    ... using http://www.z80.info/decoding.htm#intro to write the ... decoding logic. In the decoding tables it seems ...
    Travis Kaufman Travis Kaufman July 2016 Development
  • Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode. I traced it down to an OUT instruction which sends 4 to …

    ... /> Now after reading about partial decoding in the faq I made ... can take out the partial decoding (respond to 7FFD only) to ... or have I misunderstood partial decoding?
    Unique Unique February 2005 Development
  • Run Length DecodingRun length encoding/decoding is far less efficient than using a modern compression program.

    Run length encoding/decoding is far less efficient than using a modern compression program.
    chev chev March 2006 Development
  • Decoding of speccy keyboardHello everyone. I face following problem with spectrum keys decoding and need some explanation. I know how to decode a single key press by reading po…

    ... following problem with spectrum keys decoding and need some explanation.
    decoding may not be possible.
    What i need is unique decoding at least six (even better ...
    Fikee Fikee April 2008 Development
  • Undocumented DD opcodesHi, I'm emulating the DD-prefixed opcodes at the moment. What happens to an undocumented DD opcode - Phil's test suite doesn't test them. For insta…

    ... 'm emulating the DD-prefixed opcodes at the moment.

    MadDoc MadDoc July 2008 Emulators
  • Tips on (dis-)assembling Z80 instructionsedit: Naturally I managed to post this in the wrong forum. I'd much appreciate it if any moderator would move it to the development section. For the…

    ... efficient methods for parsing and decoding assembly opcodes. Note that I'm ...
    doynax doynax June 2009 Development
  • decoding speech in Creature of HavocI've been looking at the Fighting Fantasy gamebook "Creature of Havoc" for the first time, since it was mentioned yesterday in another place, and hav…

    ... encountered a small snag with decoding speech. As a reminder, the ... [b]encoding[/b] speech, not decoding it, which threw me for ...
    Battle Bunny Battle Bunny August 2010 Chit chat
  • Incorrect joystick decoding in Fuse & SpectaculatorAccording to a test that a fellow member ([B]utopian[/B]) at the [url=http://www.speccy.org/foro/viewtopic.php?f=6&t=2475]speccy.org[/url] forum has …

    ... seems to be an incorrect decoding issue for the ports used ... 40057 chip, responsible for joystick decoding, uses A0, A11 and A12 ... the keyboard pins, so the decoding process is solely performed by ...
    mcleod_ideafix mcleod_ideafix December 2011 Emulators
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... 've written an LZ77 en/decoding routine as I couldn't ...
    Battle Bunny Battle Bunny March 2012 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…

    May I reccomend my document, "decoding Z80 opcodes", found at [url="http://www.z80.info"]www.z80.info[/url], that might simplify the process of reading and figuring out the effect of opcodes...
    GOC GOC September 2004 Development
  • C# emulatorHi, I wanted to branch out and get a little better with C# so I think I need something meaty to do to keep me going....so an emulator seemed a reaso…

    ... the z80's opcodes and got your display decoding right, you'll ...
    Dunny Dunny April 2006 Emulators
  • C# emulatorHi, I wanted to branch out and get a little better with C# so I think I need something meaty to do to keep me going....so an emulator seemed a reaso…

    ... the z80's opcodes and got your display decoding right, you'll ...
    rich_chandler rich_chandler April 2006 Emulators
  • VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…

    ... . when reading zeropage)
    My decoding routine is faster than Simons ... 29).
    Some of my opcodes are faster than Simons, others ... slower.
    So depending the opcodes used in a program mine ...
    Dr BEEP Dr BEEP August 2008 Sinclair Miscellaneous
  • New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…

    ... ASCII codes for ease of decoding.
    [code]
    1 LET ... some of the more common opcodes, but I'll keep the ...
    bigjon bigjon December 2008 Development
  • Tips on (dis-)assembling Z80 instructionsedit: Naturally I managed to post this in the wrong forum. I'd much appreciate it if any moderator would move it to the development section. For the…

    ... efficient methods for parsing and decoding assembly opcodes. Note that I'm ...
    roko roko June 2009 Development
  • Tips on (dis-)assembling Z80 instructionsedit: Naturally I managed to post this in the wrong forum. I'd much appreciate it if any moderator would move it to the development section. For the…

    ... efficient methods for parsing and decoding assembly opcodes. Note that I'm ...
    Fikee Fikee June 2009 Development
  • Tips on (dis-)assembling Z80 instructionsedit: Naturally I managed to post this in the wrong forum. I'd much appreciate it if any moderator would move it to the development section. For the…

    ... .
    on Z80 instruction's opcodes are not chosen randomly. you ... can compute opcodes (check it on BIT x ... [url=http://www.z80.info/decoding.htm#intro]
    Fikee Fikee June 2009 Development
  • Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…

    ... they had to use ?spare? opcodes that had gone unused on ...
    Table translation (for encoding/decoding), TRDB (plus variants)[/CODE]
    opcodes in one mode, but also ...
    RST#08 RST#08 November 2012 Development
  • Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…

    ... if virtual memory was implemented. Opcodes were being monitored already so ... a swi, with no special decoding necessary. That stayed away from ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Sinclair Miscellaneous
  • SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…

    [QUOTE=Patrik Rak;758844]Thanks, zub. The Q register was just a broader concept along the way of analyzing this. While it conceptually exists (it is the place where the new flags are assembled before they are moved to the F register), we have no evidence ...
    zub zub March 2014 Emulators
  • SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…

    ... ="http://www.z80.info/decoding.htm"]Decoding Z80 Opcodes[/URL] (an invalid instruction ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... will either be ignored when decoding ED opcodes or cleared by the ...
    zub zub March 2014 Development
  • More "What could have been"... The Z280.So in chasing up the Loki specs, I happened upon some parallel developments... And had Sinclair gotten to make the Loki, there could have been some i…

    ... derivative chips or worse the opcodes were mapped to new instructions ... the spectrum's loose port decoding.

    Putting a 68K ...
    Alcoholics Anonymous Alcoholics Anonymous September 2021 Hardware
  • Re PSI Chess and others...After reading about Ed's 36 hour decoding mission on PSI Chess, I feel that the one thing we need is a totally comprehensive instructions section. I …

    ... about Ed's 36 hour decoding mission on PSI Chess, I ...
    Spector Spector February 2002 Games
  • PSI ChessHi, Anybody out there remember the game "PSI Chess" by The Edge? Well, there seems to be no problem finding a snapshot ot tape image for this game …

    ... is written that uses obscure opcodes or something which makes it ...
    Ed Ed February 2002 Games
<1234567…34>

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  • "Decoding z80 Opcodes" (http://www.z80.info/decoding.htm#intro) - Incorrect HALT Opcode?Apologies if this is a dupe but I searched within the forums and couldn't find anything.<br /> <br /> I've been working on a z80 emulator (for acad…
  • "Decoding Z80 Opcodes" updateHello,<br /> <br /> To whom it may concern: I've made an update to my document, "Decoding Z80 Opcodes" at [URL="http://www.z80.info/decoding.htm"]htt…
  • 2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ?<br /> <br /> Does only one of the devi…
  • Z80 register decoding document error?Hi, <br /> <br /> I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). <br /> <br /> [url="http://w…
  • Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode.<br /> I traced it down to an OUT instruction which sends…
  • Run Length DecodingRun length encoding/decoding is far less efficient than using a modern compression program.
  • Decoding of speccy keyboardHello everyone.<br /> I face following problem with spectrum keys decoding and need some explanation.<br /> I know how to decode a single key press b…
  • Undocumented DD opcodesHi,<br /> <br /> I'm emulating the DD-prefixed opcodes at the moment.<br /> <br /> What happens to an undocumented DD opcode - Phil's test suite does…
  • decoding speech in Creature of HavocI've been looking at the Fighting Fantasy gamebook "Creature of Havoc" for the first time, since it was mentioned yesterday in another place, and hav…

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