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<1234567…34>
  • "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…

    ... ://www.z80.info/decoding.htm#intro to write the decoding logic. In the ... decoding tables it seems to ...
    Travis Kaufman Travis Kaufman July 2016 Development
  • 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…

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

    I'm running in to a problem decoding ...
    vreddy vreddy December 2004 Development
  • "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
  • Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…

    ... [url="http://www.z80.info/decoding.htm"] this link, but this require ...
    tstih tstih March 2022 Development
  • Zilog Z80 ManualI'm looking at the zilog manual at the moment. (A pdf one), whilst trying to implement a basic emu, just for learning. Are there known to be many e…

    ... /> [url="http://z80.info/decoding.htm"]http://z80.info/decoding.htm[/url]
    [url ... ="http://z80.info/z80sflag.htm"]http ... ://z80.info/z80sflag.htm[/url]
    [url ...
    Dunny Dunny February 2006 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…

    ... [url=http://www.z80.info/decoding.htm#intro]
    Fikee Fikee June 2009 Development
  • 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 …

    ... [url]http://www.z80.info/decoding.htm[/url], which I'm now ... statements based on the same decoding algorithm, but will run a ...
    AY Chip AY Chip December 2011 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…

    [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…

    ... [URL="http://www.z80.info/decoding.htm"]Decoding Z80 Opcodes[/URL] (an invalid ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…

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

    The ...
    GReW GReW September 2016 Development
  • Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…

    ... [url="http://www.z80.info/decoding.htm"]Decoding the Z80[/url] page I ...
    tstih tstih March 2022 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
  • 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
  • Timex video mode & SamCoupe sound chip.Hi, people! I propose a solution which allows to use sound chip SamCoupe SAA1099 jointly with computers Timex 2048/2068. Everyone knows that these de…

    ... .micklab.narod.ru/ZXMSoundCard.htm][B]ZXM-SoundCard Lite ... 2) you must change the decoding clone ports SAA1099: [code ... ]================================================================================
    PORT ADDRESS DECODING
    hex/dec A15 ... ...
    Black_Cat Black_Cat February 2014 Hardware
  • Python script to scrape Amazon.com book reviewsI've been meaning to read the Gollancz Fantasy Masterworks (roughly 40 books) and Sci-Fi Masterworks (roughly 100+ books) lists for a while now, but …

    ... file
    saved_webpage = open('search_webpage.htm', 'r')
    page_code = ... /> os.unlink('search_webpage.htm')
    os.unlink('book_webpage.htm')

    Decoding the current binary data line ...
    BigBadMick BigBadMick April 2014 Chit chat
  • Abu Simbel Profanation &emulatorsI recently tried game from subject in Spin, EmuZWin and some other newer emulators and noticed sad fact that it works not, better said controls work …

    ... to it's crap keyboard decoding... "

    Interesting... You, who ... ="http://piters.tripod.com/cassport.htm"]http://piters.tripod.com/cassport ...
    piters piters August 2005 Emulators
  • Sinclair Basic Vs PascalWith the rise of the structured programming movement (Jackson et al) was it wise to put the Basic programming language into the Spectrum. By this ti…

    ... .no/sinclair/computers/clones/russian.htm[/url]
    For instance, the ... can generate tone? Why keyboard decoding circuit - it can do CPU ...
    piters piters September 2006 Sinclair Miscellaneous
  • On the subject of reverse engineeringIn this world of emulated hardware, there are Specchums out there who would like to put their hands on that peripheral they never had, that add-on th…

    ... .zx81.de/english/32k-rame.htm[/url]

    This seems ... to add a little more decoding for the /RAMCS and also ...
    zxbruno zxbruno May 2008 Hardware
  • RAM paging and port usageDear users and developers, I'm just trying to find some detail information about RAM paging on the Spectrum 128 and later models, especially those a…

    ... 're ignoring port decoding again (note that the decoding of "port 0x7ffd ... .worldofspectrum.org/faq/reference/tmxreference.htm#Memory]FAQ[/url].

    decoding again), the TR-DOS ROM ...
    Philip Kendall Philip Kendall June 2008 Hardware
  • DivIDE and joystick interfaceWhich joystick interface works with the DivIDE and ZX 48K? I have TurboRAM but it works not correct or blocks DivIDE. Multiface One works with the j…

    ... KEMPSTON INTERFACE with better port decoding

    b) fix this ... .cz/zx/divide/divide-bios.htm[/url]
    This bios not ...
    velesoft velesoft April 2010 Hardware
  • DivIDE and joystick interfaceWhich joystick interface works with the DivIDE and ZX 48K? I have TurboRAM but it works not correct or blocks DivIDE. Multiface One works with the j…

    ... KEMPSTON INTERFACE with better port decoding

    b) fix this ... .cz/zx/divide/divide-bios.htm[/url]
    This bios not ...
    Alien 8 Alien 8 April 2010 Hardware
  • zx81 internal ram upgrade?just curious if others have? I mean can you just rip the memory out of the ram-pack and use that.. as I'd rather just have the unit upgraded interna…

    ... %20the%20Memories.htm"]here[/URL] for some info on ZX81 memory decoding.
    RetroTechie RetroTechie May 2010 Hardware
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... .worldofspectrum.org/faq/reference/z80format.htm[/url]

    Unfortunately, I ... ? Would there be some coding/decoding ambiguities without it in some ...
    PeterP PeterP September 2011 Emulators
  • Ay Real Time Synthetizer SoftwareSpectlemen and Spectladies!It's been a long time that I'd like to ask this.... I ask thee to create a new musical software for our ZX Spectrum machi…

    ... with software doing the decoding etc), the +128K ... Sinclair/Spectrum128/ROMDisassembly/Spectrum128ROMDisassembly.htm"]Spectrum 128 ROM 0 ... compuphase.com/electronics/midi_rs232.htm"]related RS232 to MIDI ... zxspectrum.it/zz/default.htm"]Interface 1 Zombie Zombie ...
    toadstool toadstool November 2012 Development
  • Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…

    ... .worldofspectrum.org/faq/reference/ports.htm[/url]

    And it ... 2 doesn't do full decoding for the joystick ports - it ... presuming the +D does full decoding then one of those could ...
    joefish joefish April 2013 Hardware
<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…
  • 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 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…
  • 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…
  • 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…
  • Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too.<br /> <br /> [URL="http://www.speccy.org/foro/viewtopic.php?f=8&amp…
  • 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&amp;t=2475]speccy.org[/url] forum …

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