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  • Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…

    ... interrupts are disabled.

    ULA snow is (roughly) when the ... ULA fails to read from contended ... 0, 1, 3, 4 and 6 and do this:
    I ...
    Jmk Jmk March 2012 Emulators
  • BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…

    ... not need use more than 6 KHz, at this frecuency, i ... speed) it grown fast. The ULA not generate a perfect square ...
    Z80user Z80user April 2012 Emulators
  • BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…

    ... bps - 4 short pulse
    6-. OTLA 48 KHz 12000 bps ... .

    It run between 6 KHz and 600 Hz (at ... byte
    I resyn between 6 and 20 timer every byte ... [average resync is (6+20)/2=13)

    ULA in this test, it's ...
    Z80user Z80user April 2012 Emulators
  • pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…

    ... the matrix array (+2A's ULA) logic so it's not ... time. If you disable the ULA when a read is made ... will have to implement bit 6 in the GAL too, or ... end up with a deaf ULA :D
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…

    ... time. If you disable the ULA when a read is made ... will have to implement bit 6 in the GAL too, or ... end up with a deaf ULA :D[/QUOTE]

    Good ...
    bverstee bverstee April 2012 Hardware
  • pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…

    ... " (say, bypassed) a partially damaged ULA that way: display and RAM ... /> PIN 5 = KB0 ; /* */
    PIN 6 = KB1 ; /* */
    PIN 7 = KB2 ...
    mcleod_ideafix mcleod_ideafix April 2012 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…

    ... a go at reproducing basic ula cells with transistors, so perhaps ... a transistor-only ula next?
    [/QUOTE]

    6 ULA in surface mount parts just ...
    guesser guesser April 2012 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…

    ... currently taking the Harlequin, and ULA details from the book and ... a go at reproducing basic ula cells with transistors, so perhaps ... of doing a full Series 6 ULA in surface mount parts just ... different PCBs connected). The Series 6 ULA more affordable but has no ...
    antoniovillena antoniovillena April 2012 Hardware
  • BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…

    ... explain it to me, why ula cannot generate bright colors for ... & Z80Stealth 1.02
    6 bit port-a #FE - BRIGHT :)))))))
    azesmbog azesmbog April 2012 Announcements
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... .
    [*]Input port $FE bit 6: default value 1 (when there ... 1 in TK90X, but when ULA accesses a screen attribute address ...
    Einar Saukas Einar Saukas May 2012 Emulators
  • Imperica Horizons - The whole weekend :-)So now it's all over, I'll do a quick writeup... It all started for me at 5.20 am. Getting to London from Devil's Island isn't so easy now that Aer …

    ... per day, and having two 6 o'clocks in one day ... his work on the Spectrum ULA, colour timing tricks and the ...
    Paddy Coleman Paddy Coleman May 2012 Sinclair Miscellaneous
  • Outrun Europa in colourSwainy suggested that he'd like to try his luck with Outrun Europa colorful graphics and see if they can be improved. Let's give him the chance :) A…

    [QUOTE]So how is the ULA+ conversion of the Graphics tool ... have a beginner question about ULA+, couldn't find a clear ... .

    Bits 7 and 6 of each Spectrum attribute byte ...
    Ralf Ralf May 2012 Development
  • 4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…

    ... the 74LS157's and the ULA, memory is attached address lines ... between one end and the ULA, 330 Ohms. Measuring the impedence ... on memory it measures 6,5MOhm.
    ULA address lines around 5 ... .6 MOhms to ground, and on ...
    Johan1973 Johan1973 June 2012 Hardware
  • 128k ULA pinout?Is there someone who has a circuit diagram or pinout for the 128k (+2) ULA?

    ... , go to the ZX Spectrum ULA book by Chris Smith. It ... between the 128K and 48K ULA's. The main difference is ... 's an input telling the ULA to read screen data from ... 7 as in previous ULA's (A0-6). DMA7 comes from VB ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... , and palette (years before the ULA+), and a mode with one ... -color-per-pixel, and 6 channels, and...

    Wouldn ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... shows the following connection between ULA and DRAM;

    ... br /> 10 - 11
    9 - 6
    8 - 10
    7 ... - 13
    6 - 12
    5 - 5
    11 - 6
    10 - 10
    ... 13
    7 - 5
    6 - 11
    5 - 7
    Johan1973 Johan1973 August 2012 Hardware
  • 128k +2 (grey) Ear mod - New ULA and still problemsBverstee kindly sold me a 128K ula since the one in my +2 seemed to have a broken ear in. But even with the new ULA, I still can not load games throu…

    ... it reaches C49 just before ULA. Before it the level is ... a decent 3.6+ V level, but after it ...
    Johan1973 Johan1973 August 2012 Hardware
  • 128k +2 (grey) Ear mod - New ULA and still problemsBverstee kindly sold me a 128K ula since the one in my +2 seemed to have a broken ear in. But even with the new ULA, I still can not load games throu…

    For your information on my grey +2:
    R47 input side: 6 Volt signal
    R47 ULA side: 2 volt signal
    If I go any lower, it won't load.
    Used Flying Shark game and it has a custom loader.
    Knik Knik August 2012 Hardware
  • 128k +2 (grey) Ear mod - New ULA and still problemsBverstee kindly sold me a 128K ula since the one in my +2 seemed to have a broken ear in. But even with the new ULA, I still can not load games throu…

    ... /> R47 input side: 6 Volt signal
    R47 ULA side: 2 volt ... testing. I put the original ULA back in the machine now ...
    Johan1973 Johan1973 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…

    ... a look at the Spartan 6 FPGAs, a HDMI transmitter takes ... plenty of space for a ULA+ implementation :-) Xilinx application note XAPP495 ...
    JonS JonS August 2012 Hardware
  • Spectrum in black TS1500 case with grey "Sinclair ZX Spectrum" labelAt the Spectrum30 event yesterday, someone had brought a Spectrum like object with an unusual case and I never did find out whose it was or where it …

    ... a Sinclair ULA on an Issue 3 / 4 / 5 / 6 etc board ...
    rga24 rga24 September 2012 Hardware
  • Spectrum in black TS1500 case with grey "Sinclair ZX Spectrum" labelAt the Spectrum30 event yesterday, someone had brought a Spectrum like object with an unusual case and I never did find out whose it was or where it …

    ... a Sinclair ULA on an Issue 3 / 4 / 5 / 6 etc board ... 3 board with 5C112E-2 ULA. SRC 119 burned on board ...
    Encarnado Encarnado September 2012 Hardware
  • +2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…

    ... the TEA2000. Next to the ULA, that seems to be the ... . Then the signals from pin 6 and pin 7 (now Chrominance ... to Composite output on pin 6 (for displays with no s ...
    guesser guesser September 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…

    ... are socketed (and of course ULA), so I can remove them ... ]

    There are a 6 pin header on the top ...
    mcleod_ideafix mcleod_ideafix September 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…

    ... being a DVI-D/HDMI ULA+ that can be plugged into ... in time with where the ULA thinks that the TV scan ... in the FPGA - the Spartan 6 LX9 has something like 570 ...
    Winston Winston September 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... of 560MHz - the Spartan-6's voltage controlled oscillator operates ... time simulating also the Spartan-6 PLL generating this frequency, ... 3.3 volts. (Actually, the ULA's signal never actually makes ... like after two bouts of 6 cycle contention. The Spectrum ...
    Winston Winston September 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... not run altogether) and the ULA outputs all the colors ( ... a brand new genuine Sinclair ULA ZX8401. Still, the ZX ... (in my case, bit 6 and probabily bit 7).
    6, but instead the border becomes ... a write failure of bit 6 and a missing RAM. ...
    Falco-F8L Falco-F8L October 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…

    ... />
    Description almost finished. The ULA clone is complete, regarding basic ... "Xilinx" ULAplus chip. The new ULA draws about 40mW.

    For basic operation (i.e. ULA without the "plus"), this is ... I have a contention of 6 clocks (this is what I ...
    mcleod_ideafix mcleod_ideafix November 2012 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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