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Search Again :: Adv Search 1000 results in 0.002s
<1234567…34>
  • 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 ... port address from 00FD to 7FFD (faq:hardware will respond to ... take out the partial decoding (respond to 7FFD only) to fix it ... or have I misunderstood partial decoding?
    Unique Unique February 2005 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…

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

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

    DDCB ...
    vreddy vreddy December 2004 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 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
  • 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
  • Hardware description - MULTIFACE 3[B]Hardware description - MULTIFACE 3[/B] This is description of MF3 clone, because I can't find more about original interface. Schematic and PAL ch…

    ... #1FFD,#3FFD,#5FFD and #7FFD. Last writed data to all ... addressing 0101xxxx 11111101)
    - OUT #7FFD (addressing 0111xxxx 11111101)

    7FFD
    If you disable ... MF3 memory)

    Address decoding of all ports use all ...
    velesoft velesoft August 2013 Hardware
  • "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
  • Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …

    ... differences in the partial decoding of port 7FFD, as this differs between ... />
    [code]detect ld bc,$7ffd ; official paging port
    ld ... />
    ld b,$7f ; port 7ffd again
    out (c),l ...
    FishFinger FishFinger December 2017 Development
  • 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…

    ... 128k and +2:
    port 7ffd bits 0..2 select one ... 're ignoring port decoding again (note that the decoding of "port 0x7ffd ... 1 of "port 0x1ffd" (port decoding again), the TR-DOS ROM ... bits 0..2 of port 7ffd. My proposal would be a ...
    Philip Kendall Philip Kendall June 2008 Hardware
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... has very simple decoding, so xxFD works as 7FFD, and that was ...
    Shiru Shiru August 2010 Hardware
  • Rom ReplacementQuick and easy question... Is it possible to replace the +2 rom with one from a later model (+2A, B, +3)?

    ... :
    1: Add additional decoding to the 7ffd latch on the board ... using two rom chips, provide decoding for the appropriate CS.
    spodula spodula July 2011 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... br /> [code]
    PORT ADRESS DECODING
    hex/dec A15 ... A0 ... Pag(4/5)

    #7FFD/32765 0111111111111101 0xxxxxxxxxxxxx0x - Pag(2 ... /> (not confirm that the decoding for a computer #5(Didaktik ...
    velesoft velesoft December 2012 Hardware
  • Hardware description - MULTIFACE 128I make schematic of MULTIFACE 128 (v36) from PCB layers downloaded from WOS. But all PCB layers on WOS contain some bugs, absent signals, etc.. Now …

    ... this port:
    - OUT #7FFD (addressing 0xxxxxxx xxxxxx0x)
    < ... last videoram setting (OUT #7FFD,xx) + connect MF128 memory ... /> - OUT #7FFD (addressing 0xxxxxxx xxxxxx0x) - port decoding is same as ... rewrited also after reading port 7FFD).
    - IN/OUT ...
    velesoft velesoft September 2013 Hardware
  • Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]

    ... at address #7FFD:

    [code]================================================================================
    PORT ADDRESS DECODING
    hex ...
    Black_Cat Black_Cat May 2014 Hardware
  • Betadisk 128 in production.Pcb is in factory, i expect ready device in next 2 weeks. [URL=http://www.fotosik.pl/showFullSize.php?id=7b4cc1b97c1c4703][IMG]http://images52.fotos…

    ... also use original address decoding of port 7FFD as on ZX128/+2 ... only if 48rom on port 7FFD is set). Now you can ...
    velesoft velesoft November 2014 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
  • Realtime Tape Loading, Windows Speccy EmulatorHi folks, I'm very impressed by the amount of Windows Speccy Emulators that have been popping up this year !. What with Spectaculator, ZX SPIN, and…

    ... to us to do the decoding) !.

    I'm hoping ...
    Andrew Barker Andrew Barker August 2002 Emulators
  • Spectrum edge connectors and 'Dataman Softy S4'Hi, I moved this from the sales thread because it seems more appropriate...anyway... I was twerping around the idea of turning a Spectrum into a we…

    ... that it requires some address decoding etc...Anyone managed to do ...
    Dan Dan November 2002 Sinclair Miscellaneous
  • Formula OneHello, I am new to this forum but I decided to join you guys since I am a ZX Spectrum game lover. My favourite ZXS game is Formula One, available on …

    ... there was a way of decoding those characters I could do ...
    kihality kihality May 2003 Games
  • Huffman questionI'm pretty sure that the answer to my question is "no", but I just want a second opinion: Is it possible to somehow cram a Huffman decompressor + de…

    ... somehow cram a Huffman decompressor + decoding tree (for 256 elements) into ...
    GOC GOC July 2003 Sinclair Miscellaneous
  • Pentagon interface news from VELESOFTIt's from Xagon's board. It is about new interface for Speccy - it make Your comp compatible with Pentagon (and not only) and also it gives You up t…

    ... 6 and 7 of port 7FFD.
    ALLRAM mode possibility (see ... ,6 and 7 on port 7FFD.
    Intersting thing is that ... ram)
    Page switch via 7FFD, like on ZX128.
    Higher ...
    Yerz Yerz June 2004 Sinclair Miscellaneous
  • To whoever maintains the ArchiveThe program in the utilities section of the archive called "AX.25 Packet Radio" is an Ameteur Radio Data Utility as is "RTTY" which is a decoder for…

    ... an Amateur Radio utility for decoding fax transmissions
    _________________
    guesser guesser July 2004 Sinclair Miscellaneous
  • 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 ? Does only one of the devices get to r…

    1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ?

    Does only one of the devices get to receive/send the byte or do all do so ?

    An example of a troublesome command would ...
    GOC GOC August 2004 Development
  • what extra port for extra memory ? (256K, 512K, 1024K, etc.)I know that Pentagon uses some extra bits from port 7FFD for extra memory pging: - for 512K model, bit 6 & 7 of port 7FFD - for 1024K model, bit 5, 6…

    ... extra bits from port 7FFD for extra memory pging ... 6 & 7 of port 7FFD

    I personally ... that handle directly the 7FFD port, without taking into ... lock the port 7FFD (on +128K/+2) and 7FFD & 1FFD ... I will never use port 7FFD for this.

    secarica secarica September 2004 Sinclair Miscellaneous
  • ANNOUNCE: Resistor version minus 1.0.0Given the discontinued development of Taper and the vapourware nature of certain other products, there's a lack of a modern, up to date, maintained t…

    ... to date, maintained tool for decoding (encoding?) audio files into TZX ... can have a hope of decoding these in future.
    * Information ... know: write me a better decoding algorithm so that it does ...
    Philip Kendall Philip Kendall January 2005 MIA/STP/SDP
  • New GP32 coming out....The spec looks excellent and should run MAME, SNES and hopefully GBA full speed. Whats also exciting is the TV out connection !.... The ultimate ho…

    ... TV)
    Divx/Xvid hardware decoding (any resolution, just copy them ...
    psj3809 psj3809 September 2005 Sinclair Miscellaneous
  • ANN: Tipshop updated Wednesday, 30 November 2005Wednesday 30 November 2005 Happy 10th Birthday, WoS! Another massive update including 185 new adventure game solutions/tips(!!!) amongst other things…

    ... in his tips and a decoding key for Runes Of Zendos ...
    hackersanon hackersanon December 2005 Announcements
<1234567…34>

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Related Threads

  • "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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