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<1…19202122232425…34>
  • Fuse 1.2.1 releaseA new release of Fuse, the Free Unix Spectrum Emulator, is now available at the SourceForge project: [url="https://sourceforge.net/projects/fuse-e…

    ... , last byte written to the ULA, tstates since interrupt and the ...
    Fred Fred July 2016 Emulators
  • Fuse for Mac OS X 1.2.1 ReleasedA new version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url="http://sourceforge.net/projects/fuse-for-macosx/"…

    ... , last byte written to the ULA, tstates since interrupt and the ...
    Fred Fred July 2016 Emulators
  • New Game: Sewer Rage[img]https://s31.postimg.org/ulo8tuzyj/sewer_rage.png[/img] Heres my last proper Spectrum game, knock the pipes to the top of the screen to progre…

    ... follow shortly.

    Vega ULA+ compatible with keymap included.
    daveysludge daveysludge August 2016 Brand new software
  • Redesigning the ZX Spectrum 128k - A lifelong dreamHello, I am myPinballs (Jim) and i run a small business here in the uk making replacement 8-bit hardware pcbs for arcade pinball games as well as…

    ... connection
    • Uses the 128k ULA IC - Ferranti 7K010E/Amstrad 40056 ...
    myPinballs myPinballs August 2016 Hardware
  • Need some help repairing an issue 3 spectrumI am looking for some help repairing an issue 3 speccy, here's what I tried so far. The speccy is not booting up correctly, when using the diagnos…

    ... not the cause. Swapped the ULA, Rom and z80, and these ... spectrum, also putting a working ULA, Rom and z80 made no ...
    patzik patzik August 2016 Hardware
  • Upper memory issueZX Spectrum 48K, issue 2, boots fine. Lower RAM OK. When tested with the new test ROM in the Diagboard, for all upper RAM tests "FAIL" is shown. I…

    ... else).

    I swapped ULA's (5C112E) with another, working ... that was for a faulty ULA. The mini-PCB is there ... . The 2 wires to the ULA are not connected. I'd ...
    georgedb georgedb September 2016 Hardware
  • ZX Spectrum video waveformsAll work for this post was done on a ZX Spectrum issue 1 board (16k bytes of RAM only). This was what the Spectrum displayed on the TV screen: [i…

    ... composite video) signal from the ULA. This is a DC signal ...
    1024MAK 1024MAK September 2016 Hardware
  • Keyboard issues. Select keys not working.Hi Guys, Well it seams problems are like buses, you wait awhile, nothing turns up, then a couple at once. I have just got one issue 2 48k going…

    ... finger being pointed at the ULA in such situations. Man I ... witnessing the demise of two ULA's in one day! Oh ...
    RSwipeCA RSwipeCA September 2016 Hardware
  • No sound from ToastrackHi everyone, not posted in here in a while! Anyway I have a really nice "toastrack" I am working on at the moment which just needs a new keyboard …

    ... (hope it isn't the ULA)? It loads and runs everything ...
    britain4 britain4 October 2016 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    ... going to risk damaging the ULA by demanding too much power ...
    joefish joefish October 2016 Hardware
  • Spectrum +2 various problemsHey there, I just recently acquired a Spectrum +2 and it's got various problems with it. First off, I get a rolling picture through both RGB and comp…

    ... I may have a bad ULA on my hands as well ... . Would a bad ULA cause a rolling picture or ...
    ApolloBoy ApolloBoy October 2016 Hardware
  • bizarre error on a grey ZX Spectrum+2 - the long search for a small problemHi, I got a ZX Spectrum+2 that worked a bit but crashed while loading or running 128k games. I installed a 128k-test-ROM that told me about RAM fa…

    ... ; no effect
    * changing the ULA and the gate array 40058 ...
    ingo ingo November 2016 Hardware
  • Shimmering displayHi all, I've got a 48K issue 4S and it appears to be working apart from it's displaying weird vertical shimmering patterns. It passes a RAM test t…

    ... /> I've swapped out the ULA with no change and also ... display after it leaves the ULA now after swapping all that ...
    Jet5y Jet5y November 2016 Hardware
  • How would you approach parallax?So ... there is this trick by Joffa that we all know...of waiting for the ULA to reach certain pattern on the screen using the IN command. And then s…

    ... know...of waiting for the ULA to reach certain pattern on ...
    tstih tstih November 2016 Development
  • New Game: Crappy CratesHeres something I knocked up for the festive period, a bit of a Sokoban type affair where you have to stack crates in the designated area whilst avoi…

    ... />
    Features music by Yerzmyey, ULA+ colours and a few bugs ...
    daveysludge daveysludge December 2016 Brand new software
  • Contended memory article on WikipediaYeah, apparently there's one. https://en.m.wikipedia.org/wiki/ZX_Spectrum_Contended_Memory [quote] However, the ULA must wait for a Z80 read or wr…

    ...

    [quote] However, the ULA must wait for a Z80 ... access the memory. As the ULA has no capacity to prefetch ... is in progress when the ULA must read video data, the ...
    Hikaru Hikaru December 2016 Sinclair Miscellaneous
  • help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…

    ... . so could this be ula? but the ula seems fine in the ...
    cypher007 cypher007 December 2016 Hardware
  • ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…

    ... " the clk line from the ULA (6c001e-7) to the z80 ...
    Trantor Trantor January 2017 Hardware
  • TK90X/TK95X specific software?Is there such a thing? Also: When setting the ULA in 50Hz (PAL-N) mode the timing appears to get quite close to the original ZX as seen with the sho…

    ... ?
    Also: When setting the ULA in 50Hz (PAL-N) mode ...
    Shockwav3 Shockwav3 January 2017 Software
  • Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …

    ... 've also swapped over the ULA and no change there either ...
    Jet5y Jet5y January 2017 Hardware
  • Screen resolutions and the Speccy's limits?What list of screen resolutions/palettes could the ZX Spectrum feasibly produce on a standard PAL TV if RAM, ULA or other space constraints is not a …

    What list of screen resolutions/palettes could the ZX Spectrum feasibly produce on a standard PAL TV if RAM, ULA or other space constraints is not a limiting factor. What are the theoretical limits for a 128K model for example and why?
    Rebelstar Rebelstar January 2017 Hardware
  • +2 tape input protectionI'll start this by admitting I've not checked on a 48K or Toasty-Rack diagram to see how the tape input is actually wired in but what I'm asking is f…

    ... less fed straight into the ULA on these machines.

    spider spider January 2017 Hardware
  • Issue 2 problem.Hi all, I'm trying to repair / upgrade an Issue 2 Spectrum for a friend, but have come accros the following problem. When I power the machine …

    ... spares box, and swapping the ULA with another working one.
    prime prime February 2017 Hardware
  • Lambda 8300 Color module (ZX81)I was gifted such a device yesterday and have a few questions ... First of all it appears the interface does work in general when used with a 16K …

    ... required due to a 2C210E ULA, no inverse video - quality on ...
    Shockwav3 Shockwav3 February 2017 Hardware
  • Looking for advice on building a HarlequinNew member here. From the US. My first computer was a Timex Sinclair 1000 back in the early 80s (in fact, I got one of the first batches sold in th…

    ... 've purchased Chris Smith's ULA book and am anxious to ...
    msansom msansom February 2017 Hardware
  • Spectrum 48k Clock SpeedSo I was reading the [url="http://www.worldofspectrum.org/pub/sinclair/technical-docs/ZXSpectrum48K_ServiceManual.pdf"]Spectrum 48k Service Manaul[/u…

    ... the logic
    gate array (ULA) and has a standard three ... wrong isn't it? The ULA gets a 14MHz clock but ...
    msansom msansom February 2017 Hardware
  • ZX-Paintbrush 2.6.2 publishedDear readers, I'm back since some months. I returned to a few programming on ZX-Blockeditor, ZX-Assembler. Today I fixed a problem on ZX-Paintbru…

    ... -Paintbrush having to do with ULA+ drawing cluts 1,2 or ...
    clausjahn clausjahn March 2017 Software
  • ZX Spectrum border and sound problemAfter recap stange problem with ZX Spectrum (issue 3b) with sound and border. See video at: [url="https://drive.google.com/file/d/0BwhYHKW6xjI-aVdMcE…

    ... little slow. I was replaced ULA, CPU, ROM, RAM, (same thing ... friend take osciloscope screenshoot from ULA pin 28 and speaker here ...
    skydiver021 skydiver021 March 2017 Hardware
  • ZX Spectrum border and sound problemAfter recap stange problem with ZX Spectrum (issue 3b) with sound and border. See video at: https://drive.google.com/file/d/0BwhYHKW6xjI-aVdMcEY4ajVk…

    ... little slow. I was replaced ULA, CPU, ROM, RAM, (same thing ... friend take osciloscope screenshoot from ULA pin 28 and speaker here ...
    skydiver021 skydiver021 March 2017 Hardware
  • Kempston interface schematic: wrong IC?Hi! I'm trying to learn about the inner workings of the speccy, and I thought that building a kemspton interface would help me learn about things lik…

    ... />
    But looking at the datasheet for the 74LS240 (http://ecee ...
    Mikelone Mikelone March 2017 Hardware
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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