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  • PFlagsIs there an explantion somewhere of what bits mean what in the printing flags? 1 23658 FLAGS2 More flags. 1 23693 ATTR P Permanent current col…

    ... /> Yes I use the undocumented Z80 instructions that you found quite ... :

    SHR A ;shrink contents of A
    SHR (HL ...
    roko roko December 2011 Development
  • PFlagsIs there an explantion somewhere of what bits mean what in the printing flags? 1 23658 FLAGS2 More flags. 1 23693 ATTR P Permanent current col…

    ... ]Yes I use the undocumented Z80 instructions that you found quite ... :

    SHR A ;shrink contents of A
    SHR (HL ...
    Dr BEEP Dr BEEP December 2011 Development
  • 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…

    ... /> Again I would use the initial hardware concept with some small ... (bufferd by a lithium cell), Z80 DMA chip, realtime clock, IDE ...
    ingo ingo December 2011 Hardware
  • A misbehaving DivIDE 57c (Now repaired)Hello there my fellow WoS'ers Indeed it has been a while since my last post, please let me wish you all a (belated) Happy New Year, my this year bri…

    ... these units have a new Z80 CPU with Good M1 and ... without crashing - which was an initial problem when connected to the ...
    Zetr0 Zetr0 January 2012 Hardware
  • A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…

    ... you want to compile the z80 libraries yourself :- this includes compiling ... /> 2. Download and copy all contents to a new folder you ...
    Alcoholics Anonymous Alcoholics Anonymous January 2012 Development
  • What (Speccy) game are you currently playing ?(Quite a few threads on what youre listening to, watching etc) What Speccy game are you currently playing ? After playing a LOT of Invasion of the …

    Retrobrothers, the reason World Class Leaderboard was so slow, is because it was emulating a 6502 as the initial coder thought it'd be easier to emulate the 6502 than port it to z80. :)
    Baggers Baggers February 2012 Games
  • 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.…

    ... see this is slow (in z80 terms this is an LDIR ... extra complication; while reading the contents of the window you always ... own circular buffer code in z80 to speed things up.
    Alcoholics Anonymous Alcoholics Anonymous March 2012 Development
  • Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …

    ... ]This is a tool for Z80 coders who wish the Spectrum ... PUSH to copy the
    contents of the serial (or byte ...
    R-Tape R-Tape April 2012 Development
  • Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…

    ... 've just tried running that Z80 snapshot and it is something ... rather carried away with the initial premise anyway, and I've ...
    Battle Bunny Battle Bunny May 2012 Development
  • Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…

    ... 've just tried running that Z80 snapshot and it is something ... rather carried away with the initial premise anyway, and I've ...
    zxbruno zxbruno May 2012 Development
  • IND/INDR/INI/INIR/OUTD/OTDR/OUTI/OTIRI'm looking for confirmation that the official Z80 User Guide from Zilog is wrong and that these composite instructions actually change the value of …

    ... for OTIR:

    The contents of the HL register pair ... (B) is decremented[/B], the contents of register C are placed ... />
    Unnecessarily wordy; my other z80 book does it more economically.
    Alcoholics Anonymous Alcoholics Anonymous May 2012 Emulators
  • IND/INDR/INI/INIR/OUTD/OTDR/OUTI/OTIRI'm looking for confirmation that the official Z80 User Guide from Zilog is wrong and that these composite instructions actually change the value of …

    ... for OTIR:

    The contents of the HL register pair ... (B) is decremented[/B], the contents of register C are placed ... />
    Unnecessarily wordy; my other z80 book does it more economically ... in at least two broken Z80 cores.
    chev chev May 2012 Emulators
  • Would things of been better if the NMI was fixed ?I was just wondering, if the NMI bug was fixed say early on in production, so for instance all issue twos (and late issue ones) and beyond had the "f…

    ... ' (i.e. jump to NMIADD contents) during prototyping (having NMI would ... /> As someone who can code Z80, and is pretty familiar with ...
    RST#08 RST#08 May 2012 Hardware
  • Faulty Grey Spectrum +2 - help neededI have a faulty spectrum +2. I tested the voltaged inside - all check fine. Well, within some limit, +5 for example is 4.83, but all other voltages a…

    ... to the right of the Z80 and same size (don't ... ://www.dataserve-retro.co.uk/contents/en-uk/d8.html[/url ...
    gtsamour gtsamour May 2012 Hardware
  • A new ZX spectrum cloneOver the past 12 months i have been developing a new spectrum clone as a hobby project to waste my spare time on. It is still not fully complete yet …

    ... coprocessor to halt the Z80 when the initial ROM address routine for ... could inject code to the Z80 (shadowing the ROM) to let ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... 2 board, because ROM and Z80 are socketed (and of course ... every 65536 counts. With an initial frequency of 50MHz, the output ...
    mcleod_ideafix mcleod_ideafix September 2012 Hardware
  • Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…

    ... "jp p" and doing an initial jump to the "dec d ... the zip file, with this contents:

    [CODE]
    ; Note ...
    antoniovillena antoniovillena November 2012 Development
  • Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…

    ... "jp p" and doing an initial jump to the "dec d ... the zip file, with this contents:


    [/QUOTE]
    Dr BEEP Dr BEEP November 2012 Development
  • ring of darknesshi please can anyone help me to get ring of darkness to work. i have tried the game on line and using an emulator , no luck. i played it on a dragon …

    ... time was Gerton Lunter's Z80. It has a handy feature ... stages of the game, as Z80 always goes directly to the ... file.

    In fact, Z80 is the only emulator I ... a time and reads the contents sequentially. Thus with Ring of ...
    Battle Bunny Battle Bunny November 2012 Games
  • DivIDE on +3Hi guys! I need some help with my DivIDE interface. It?s a standard DivIDE from Ebay, no Plus. It works quite well, but actually I have three proble…

    ... able to access the card contents directly from your PC (it ... your Divide (using tap files, z80 files will load OK).
    Zup Zup December 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... he SAM patched with the contents of file nmi.spx, which ... to be visible by the Z80 as its sole memory address ... space), retrieves whatever values the Z80 registers had when the snapshot ...
    mcleod_ideafix mcleod_ideafix January 2013 Hardware
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... ;674206]could either of the z80's in these interfaces access ... as well as the main z80[/QUOTE]

    SPECTRA doesn ... 't have its own Z80 CPU. All logic on the ... SPECTRA. You cannot write the contents of the SPECTRA memory back ...
    BloodBaz BloodBaz January 2013 Sinclair Miscellaneous
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... , and an initial version of the integrated decompiler in Z80 assembly. The ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... may help to understand their contents.[/QUOTE]

    I've ... border.

    Apparently the Z80 clock speed is 3.575611 ... is being accessed by the Z80 (i.e. not considering MREQ ...
    zub zub January 2013 Hardware
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... , $50000 lower

    ; Preserve initial address
    push de

    ; Recover initial address
    pop de
    ld c, (hl) ; swap contents (HL) and (DE)
    ld ...
    Einar Saukas Einar Saukas January 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... you can change the "initial third" with a single ... br />
    ; Preserve initial address
    push de

    ; Recover initial address
    pop de
    contents (HL) and (DE)
    ex ...
    Einar Saukas Einar Saukas January 2013 Development
  • Checksum routine wantedI wish to make a program that verify integrity of a Multiface 1 ROM. It is possible to compare each byte of the ROM against a binary dump, but this i…

    ... ] ld de,8192 ; M1 ROM initial address
    ld h,e ... much more efficient implementation in Z80, and I see no advantage ...
    Einar Saukas Einar Saukas February 2013 Development
  • Adding TAP file contents to a Spectrum +3e DOS PartitionHello my fellow WoS'ers, This thread is a companion to a great little guide from a fellow AmiBayer [B]mnjnurney[/B] you can view his thread by [URL…

    ... modified loader based on the initial
    REM auto-run file ... ", enter @ just to list the contents
    REM of the TAP ... clear from the list of contents as to whether it will ...
    Battle Bunny Battle Bunny February 2013 Games
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... that prevent reading of its contents, though?)

    [QUOTE]I ... lot if stuff about the Z80 and its architecture.[/QUOTE]
    Z80 control lines work (mainly /M1 ...
    zub zub February 2013 Hardware
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... I would guess that RealSpectrum, Z80 (the emulator) and X128' ... this on. RealSpectrum and Z80 seem to have the same ... 's bus (and the Z80) in named MREQ. I ... the Spectrum's (and the Z80) is named M1. Again ... possible to read the contents and clone them back ...
    zub zub February 2013 Hardware
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
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    John Elliott on April 21
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