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  • Emulation of ZX Spectrum 128+2 (grey)Please read this thread: [url]http://www.worldofspectrum.org/forums/showthread.php?t=35523[/url] result: exist 3 (or more) versions of grey ZX Spect…

    [QUOTE=velesoft;558451]Rading of port 7FFD on ZX128 and grey +2 models write to paging port always #FF value.[/quote]

    Incorrect. I suggest you run fusetest.
    Philip Kendall Philip Kendall August 2011 Emulators
  • BUZZSAW+ Demo No. 3Right, another demo of BUZZSAW+. [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_3.tap"]Joefish_Buzzsaw_Demo_3.tap[/URL] The default con…

    ... same rate while you're decoding), and I'm not in ...
    gasman gasman August 2011 Development
  • BUZZSAW+ Demo No. 3Right, another demo of BUZZSAW+. [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_3.tap"]Joefish_Buzzsaw_Demo_3.tap[/URL] The default con…

    ... same rate while you're decoding), and I'm not in ...
    R-Tape R-Tape August 2011 Development
  • Gigascreen - programming guideDoes anyone know of a programming guide for the 128K gigascreen screen mode, specifically a persistence colours table, some code (pref. C level or BA…

    ... is bit D3 on port 7FFD(vram) ignored and videoram switching ...
    velesoft velesoft August 2011 Development
  • 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…

    ... ? Would there be some coding/decoding ambiguities without it in some ...
    PeterP PeterP September 2011 Emulators
  • 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…

    ... knowing when to end the decoding process. In version 2 and ...
    Arjun Arjun September 2011 Emulators
  • 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…

    ... knowing when to end the decoding process. In version 2 and ...
    PeterP PeterP September 2011 Emulators
  • 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…

    ... stick to the book. Start decoding the compressed memory block after ... the end marker, simply stop decoding and end the z80 loading ...
    Arjun Arjun September 2011 Emulators
  • 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…

    ... ), the size of data AFTER DECODING is always 48K (simply, the ...
    PeterP PeterP September 2011 Emulators
  • 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…

    ... ), the size of data AFTER DECODING is always 48K (simply, the ...
    Dunny Dunny September 2011 Emulators
  • TZX format rev. 1.21Once 1.20 draft seems to be official now I would like to suggest some additiones to do on 1.21. I hope it will be easier to upgrade once block 19 has…

    ... , own tape file format and decoding utils, oh and either teflon ...
    Andrew Barker Andrew Barker September 2011 Emulators
  • 'rain' error on British Spectrums?Hi guyz. Is there any scheme of 'umbrella' modification for British Spectrums? I mean the mod to avoid 'raining' effect, visible on this video: […

    ... and ignore reading of port #7FFD)
    velesoft velesoft September 2011 Hardware
  • Structure of numeric arraysHi all, I have saved from my spectrum a numeric array using 'SAVE "array" DATA a()'. I now have the resulting file on my PC and I am trying to get …

    ... of the steps involved in decoding the bytes.

    for ...
    jagman5994 jagman5994 September 2011 Development
  • Uknown HardwareHello there my fellow WoS'ers Upon my travels (into my storage) I do find some little gems now and then that I always promise myself I would look mo…

    ... I guess there's some decoding and paging logic there.
    guesser guesser September 2011 Hardware
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... can reuse some of the decoding, saving some gates in the ...
    antoniovillena antoniovillena October 2011 Development
  • Is it possible to access the +3 disk drive via m/c in USR0 mode?Is it possible to access the disk drive of the +3 via m/c +3DOS calls when running in USR0 mode? I ask because I'm having an awful lot of trouble ge…

    ... later restoration
    ld bc,$7ffd ; paging port
    ld a ... />
    di
    ld bc, $7ffd
    ld a,($5b5c)
    di
    ld bc,$7ffd
    ld a,($5b5c)

    di
    ld bc,$7ffd
    ld a,($5b5c)
    cmonkey cmonkey October 2011 Development
  • Distinguishing between models?I'm running the risk of being pointed to the faq here, so sorry in advance. Something I'm trying out requires that the program can distinguish betwe…

    ... to use the different partial decoding of "port 0x7ffd" rather than ...
    Philip Kendall Philip Kendall November 2011 Development
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... by looking at the partial decoding of port "0x7ffd". Obviously this ...
    Philip Kendall Philip Kendall November 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... by looking at the partial decoding of port "0x7ffd". Obviously this ...
    csmith csmith November 2011 Hardware
  • converting ZX128 software for SAM COUPESAM COUPE is computer compatible with ZX48 model. Use same ports, same keyboard with compatible membrane, 64kB adress space with possibility connect …

    ... :)

    Memory paging port #7FFD is rewrited to #7F81 (#xx81 ...
    velesoft velesoft December 2011 Games
  • Alkatraz protection systemI recently became interested in the Alkatraz protection system, a very widely used tape protection (a infoseek search returns more than one hundred r…

    ... , and it's slower when decoding data than when searching for ...
    lfaria lfaria December 2011 MIA/STP/SDP
  • +3 disks and IPF formatIn order to avoid derailing the Spectaculator 7.5 release thread, I've created this thread for further discussion of the IPF format for +3 disks that…

    ... [/url] the source for IPF decoding has been released, thus making ...
    MrCheese MrCheese December 2011 Emulators
  • Arkanoid - Hit Squad ReleaseInfoseek (and the [URL="ftp://ftp.worldofspectrum.org/pub/sinclair/games/a/Arkanoid(TheHitSquad).tzx.zip"]TZX[/URL] itself) identifies the Hit Squad …

    ... 3e 30
    ld bc, $7ffd ; e072 01 fd 7f
    jp jp December 2011 Infoseek database
  • 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 ... statements based on the same decoding algorithm, but will run a ...
    AY Chip AY Chip December 2011 Emulators
  • MB02+IDE aliveLast weekend I finished soldering and testing my MB02+IDE. All items work perfectly on +2 grey, on +2A, on 128k heatsink and on 48k Issue2 and 3b tes…

    ... of course all the bus decoding logic. It also means you ...
    Winston Winston December 2011 Hardware
  • MB02+IDE aliveLast weekend I finished soldering and testing my MB02+IDE. All items work perfectly on +2 grey, on +2A, on 128k heatsink and on 48k Issue2 and 3b tes…

    ... of course all the bus decoding logic. It also means you ...
    bverstee bverstee December 2011 Hardware
  • Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…

    ... ,ixl ;Update BC counter after decoding a repetition
    inc hl ...
    mcleod_ideafix mcleod_ideafix January 2012 New game ideas
  • Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…

    ... ,ixl ;Update BC counter after decoding a repetition
    inc hl ...
    DaRkHoRaCe DaRkHoRaCe January 2012 New game ideas
  • Spectrum 48K - upper memory MIAI have recently acquired a ZX Spectrum which, according to the sticker on the bottom, should be a 48K model. It's an Issue 3 board, with upper memory…

    ... or more of the address decoding and control logic ICs (IC25 ...
    Zorn Zorn February 2012 Hardware
  • Ultimate Collected Works, no Underwulde, why?I managed to get my grubby paws on the "Ultimate Play The Game" "The Collected Works" off E-bay.... The set has 1. JetPac 2. Pssst 3. Tranz-AM 4. Co…

    ... /> [/code]
    On the 128 $7FFD is the paging control address ...
    Battle Bunny Battle Bunny February 2012 Games
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