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  • Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…

    ... . Playing sounds, both via the ULA and the AY, also affects ... suspect a fault with the ULA (or some sort of capacitive ... same RGB signals as the ULA outputs to the 8-pin ... inputs that leaks into the ULA’s signals and into the ...
    Ast_A_Moore Ast_A_Moore January 2018 Hardware
  • Finally got myself a 128k toastrack too ! :)Hi all, I recently bought a vintage computers lot on eBay, just because there was a toastrack inside (and a better looking CPC 6128 with edge conne…

    ... issue 6U with an Amstrad ULA.

    [img]http://bugpat ...
    bugpat bugpat January 2018 Hardware
  • New colour palette for Spectrum emulators, 16K/48K/+ machinesI’ve made a colour palette for 16K/48K/+ machines, based on the YUV voltage tables in Chris Smith’s book The ZX Spectrum ULA. This colour palette …

    ... ’s book The ZX Spectrum ULA.

    This colour palette ... use the original Sinclair Ferranti ULA, 5C102E, 5C112E or 6C001E. It ...
    rga24 rga24 February 2018 Updates
  • Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …

    ... . I'm assuming z80 and ULA are working for it to ...
    dave18 dave18 March 2018 Hardware
  • Whats the name of the chip that replaces the ULA?I can't find it through searching using the above title. I distinctly remember reading about a new type of programmable chip that can be set to behav…

    I can't find it through searching using the above title. I distinctly remember reading about a new type of programmable chip that can be set to behave like different processors. Anyone?
    mik3d3nch mik3d3nch March 2018 Chit chat
  • +2 crashes upon pressing some keysYears ago I purchased off ebay a mint condition, Dixons special offer boxed UK-made issue 1 +2. I did not use it so much until recently however, focu…

    ... of test programs for the ULA and RAM, first [url="http ...
    Alessandro Grussu Alessandro Grussu April 2018 Hardware
  • Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…

    ... missing on the emitter. The ULA was also getting hotter than ... resort I tried swapping the ULA with a known working one ...
    Your Spec-chum Your Spec-chum July 2018 Hardware
  • Testing an Interface 1As title, is there an easy way on how can I test to see if its functional or not please ? :) Please bear in mind I do not have *any* microdrives n…

    ... recall a faulty Z80 or ULA can make it appear broken ...
    spider spider July 2018 Hardware
  • SLAM48 ula will have a PAL/NTSC selector?So I read that elsewhere, however is it a rumor or is it confirmed? But is that even possible?

    So I read that elsewhere, however is it a rumor or is it confirmed?

    But is that even possible?
    Renegade Renegade November 2018 Hardware
  • ZX81 composite modHi guys. I have picked up a ZX81 untested for a few quids. I do have a problem tuning it correctly on a Crt TV. I cannot get better than a wavy black…

    ... press keys). I assume the ULA may be ok but ram ... is an issue 1 with Ula marked 2C184E.
    thanks
    repetto74 repetto74 December 2018 Updates
  • How are LAST-K and FLAGS set on a Real Spectrum?Hi, I'm writing a Spectrum emulator and I've got Horace and the Spiders working (with the wrong colours and no sound) but when I boot into ROM non…

    ... a real Spectrum by the ULA but I couldn't find ...
    garethadams garethadams January 2019 Emulators
  • ZEsarUX Beta 7.2-RCHi I have uploaded a new ZEsarUX Beta version: 7.2 Release Candidate! Next version will be final stable :) You can download it from: https://g…

    ... (in my machine) when only ULA and/or Tiles enabled
    chernandezba chernandezba March 2019 Emulators
  • Sinclair 16k Ram pAck Issue3 schematicsHi guys, I am willing to repair a 16k ram pack for the ZX81 but I cannot find any schematic of the ISSUE 3 ram pack. I could only find a schematic…

    ... 's I/O one single ULA on nest issues. The problem ...
    repetto74 repetto74 March 2019 Hardware
  • 48K picture quality vs motherboard revision?A subject thas has probably been covered elsewhere and hundreds of times, I know. But I never quite understood if there was some identifiable patt…

    ... motherboard revision with a particular ULA that yeld the best results ...
    Renegade Renegade March 2019 Hardware
  • Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …

    ... at which moments the 48K ULA samples the current border color ...
    kosarev kosarev April 2019 Emulators
  • ZEsarUX stable 7.2Hi! I have uploaded a new stable ZEsarUX version 7.2! You must go to the Releases section on the GitHub project to download It, as usual: htt…

    ... (in my machine) when only ULA and/or Tiles enabled
    chernandezba chernandezba April 2019 Emulators
  • Replacing voltage regulators - need to sanity check a few things pleaseHi Everyone I'm in the process (with a lot of help from some friends at Greenford Computer Club), of giving my three Speccys some much needed prev…

    ... greatly appreciated.

    [b]ULA heatsinks[/b]
    As the ... a heatsink to the the ULA without needing to desocket it ... 'll need to pull the ULA out of the +2 in ...
    chrisgreen chrisgreen May 2019 Hardware
  • A next Spectrum ROM with Turbo and MonitorI made a copy of a secondary ROM file that was used in my Didaktik Gama (Czech Spectrum clone with original ULA) but it was probably made for 48k Spe…

    ... (Czech Spectrum clone with original ULA) but it was probably made ...
    pavel_krivanek pavel_krivanek July 2019 MIA/STP/SDP
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    Hi Guys

    Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I correct assuming its reading a byte of screen ram then an attribute byte, and so on...?
    Dax Trajero Dax Trajero August 2019 Development
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... with the seller keeping the ULA ic. Pictures in the auction ... did was to fit a ULA and get the board to ...
    Your Spec-chum Your Spec-chum August 2019 Hardware
  • ZX Spectrum rescued from a friend, has Issues.Hi guys, I've recovered this ZX spectrum 48K from a friend. It's a 1984 ISSUE 6A. He told me the last time it was turned on was about 30 years ago!.…

    ... Diags, all of the tests (ULA, RAM, ROM) were OK, so ...
    TigerZX TigerZX September 2019 Hardware
  • How do emulators make code appears as running at 3.5Mhz?Decent Z80 emulators on github return t-states after executing an instruction, giving you the ability to emulate Speccy relatively well. But there ar…

    ... 23 t-states), isn't ULA painting during the instruction too ...
    tstih tstih October 2019 Development
  • ZEsarUX Beta 8.1Hi! I have uploaded a new ZEsarUX 8.1 BETA version. You can download compiled versions for Windows, Mac, and the source code from: https://gith…

    ... scroll x,y on ula layer
    -optimized ula,lores render routines ...
    chernandezba chernandezba November 2019 Emulators
  • ZX Spectrum Accessories for ChristmasI am thinking of asking my wife to get me some ZX Spectrum accessories for this Christmas but I do not know what to ask for. I'm thinking of a DIV…

    ... kit with some kind of ULA Plus.

    Does anyone ...
    Scottie_uk Scottie_uk December 2019 Sinclair Miscellaneous
  • ZX Interface 1Hi, I have a ZX Interface 1 which I have bought online. It does not seem to work. When using CAT1 or any other specific commands, the compute…

    ... ' transistor soldered directly on the ULA. Ula is LA15-302.

    ULA.

    All these seem ... ROM is dead or the ULA?

    And another question ...
    payty payty February 2020 Hardware
  • ZEsarUX 8.1 stableHi! I've uploaded a new ZEsarUX 8.1 stable version. Go to the github released webpage to download it: https://github.com/chernandezba/zesaru…

    ... official SD images
    -optimized ula,lores render routines: 2% less ... /> -added scroll x,y on ula layer
    -added 1-bit ...
    -fixed "bit 7 = Disable ULA output (soft reset = 0)" on ...
    chernandezba chernandezba February 2020 Emulators
  • ZX Spectrum 48K Issue 4B No soundHi, I have a ZX Spectrum 48K Issue 4B without sound. I tested the ULA on another Spectrum and works fine, tested the speaker and it has the correct …

    ... sound.
    I tested the ULA on another Spectrum and works ... , tested continuity from pin 28 ULA to emitter of TR7 no ...
    bganhao bganhao May 2020 Hardware
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