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  • Halnziye HY610 thermal grease - Anybody used this before?Just wondered if any of you pc tinkerer guys have used this before or know of this thermal grease, and how you rate it. :-?

    Just wondered if any of you pc tinkerer guys have used this before or know of this thermal grease, and how you rate it. :-?
    Your Spec-chum Your Spec-chum November 2020 Chit chat
  • zx spectrum ULA upgradei have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be…

    i have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be used but should some resistor values be changed to match it ?
    thanks mark ..
    mark8bit mark8bit January 2021 Hardware
  • Tutorial - full game from scratch in z80 assemblyI wrote a game from scratch to release in z80 assembly and wrote it down in tutorial form. Target is basically 48k speccy with the AY chip, or 128k s…

    ... from scratch to release in z80 assembly and wrote it down ... at http://iki.fi/sol/z80
    Sol_HSA Sol_HSA May 2021 Development
  • specie external keyboard - revision one -[img]https://photos.app.goo.gl/pqeYpXnLqTwYkLvKA[/img] revision one of my external keyboard ... wow it actually worked after a little bit of crash…

    ... to send the signal to Z80. ???. thinking i may have to ... read .. trying to read the ULA book by chris smith .. very ...
    mark8bit mark8bit August 2021 Hardware
  • boot fail .. bad address lines A7,A12,A13anybody have any ideas what could be wrong with this specie issue 3B .. work done : removed rom, upper ram & logic put lower ram multiplexers in sock…

    ... , full recap, fitted switching regulator, z80 in socket (i may have ... ) tried different CPU's & ULA's. fitted lower ram module ...
    mark8bit mark8bit August 2021 Hardware
  • Spectrumpedia revised and extended edition. Suggestions about possible new contentFor the 40th anniversary of the first launch of the Spectrum, I am going to revise the Spectrumpedia. Feedback was very positive, although the fact t…

    ... /> Matranet (defunct)

    [i]Z80 Assembly cross-compilers[/i]
    Smith, Chris, [i]ZX Spectrum ULA, The: How To Design A ...
    Alessandro Grussu Alessandro Grussu October 2021 Sinclair Miscellaneous
  • 48k ULA heat sink required ?ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ? i wonder if anybody has done any …

    ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ?
    i wonder if anybody has done any before & after heat tests ?
    mark8bit mark8bit October 2021 Hardware
  • Interface 1 ULAIs there a technical description of the functionality of the Interface 1 ULA, similar to the "The ZX Spectrum ULA" book? Specifically, what is the…

    ... functionality of the Interface 1 ULA, similar to the "The ZX ... Spectrum ULA" book?

    Specifically, what ... the ROMEN lines of the ULA? Superficially, ROMCS feeds into the ...
    Jonathan Harston Jonathan Harston December 2021 Hardware
  • How do you publish your Z80 code online?I'm starting a blog about my pet project. One of the requirements is to publish explanatory Z80 code. What tools do you use for syntax highlighting? …

    ... requirements is to publish explanatory Z80 code. What tools do you ... that I can feed raw Z80 code with and it does ...
    tstih tstih December 2021 Development
  • Is it possible to make the Z80 execute a bizarre instruction?What happens when it gets an unrecognised instruction OP Code, I mean something following a #ED that isn't one of the undocumented instructions eithe…

    ... question can one fry a Z80 say by some sort of ...
    dmsmith dmsmith March 2022 Development
  • New discovery on Z80 interrupts.This is to announce the discovery of a new, hitherto unknown, behavior of the RETI and RETN instructions. As everyone knows, the maskable interrup…

    ... can be tested on Visual Z80 Remix: https://floooh.github.io ...
    rich_chandler rich_chandler April 2022 Emulators
  • +2aI have a +2a and it wont boot properly get the white border with black square when first powerd on but then just goes into a black screen instead of …

    1) Fried Z80, although it'd probably just ... ROM
    3) Screwed up ULA that can no longer output ...
    cyborg cyborg November 2001 Sinclair Miscellaneous
  • Which emulator and assembler?Hi, I am looking to learn z80 assembly language and I feel the best option is a spectrum emulator and an assembler. Can anybody recommend the best …

    ... you want just to learn z80 assembly,
    you really don ... this contended memory and exact ULA stuff... so zx32 may be ...
    Mikie Mikie August 2001 Sinclair Miscellaneous
  • WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully but the incorporated datacorder is simply worn out and won't load ANYTHING. Dirty sig…

    ... machine.

    The ULA chip uses the same pin ... FE are always one. The ULA with the lower 16K of ... address buses of the Z80 and the ULA are connected by ... buses. However, if the Z80 wants to read or write ... the lower 16K, the ULA halts the processor if it ...
    Dr BEEP Dr BEEP November 2001 Sales
  • Emulator_designHi guys, can anyone direct me to some links which explain how to write ZXSpectrum emulators. Thanks in advance.

    ... , all you need is a Z80 core, which is tedious to ... not fundamentally difficult and enough ULA emulation to get the screen ...
    Philip Kendall Philip Kendall April 2002 Emulators
  • Emulator_designHi guys, can anyone direct me to some links which explain how to write ZXSpectrum emulators. Thanks in advance.

    ... (or imagination) was at the ULA side. Yes, I can imagine ... write a Z80 emulator but the problem is the ULA. I think ... this?
    (like a good Z80-ULA interaction document).
    Am I ...
    Anonymous Anonymous April 2002 Emulators
  • what is the best..............hi there, could anyone tell me what is the best emulater as I no longer have a spectrum but would really like to get hold of an emulator but which on…

    ... -closed information emulators, such as Z80, ZX32 or SpecEMU. Of these ... quite glaring bugs in the z80/ULA emulation at the moment, such ...
    Dunny Dunny April 2002 Emulators
  • ANN: Spectaculator 2.5 available for downloadHi. I've just released a new version of Spectaculator, available from [url="http://www.spectaculator.com/"]http://www.spectaculator.com/[/url]. Hopef…

    ... Woody's blazingly fast ASM ULA renderer - it renders using only ... down. His almost pure ASM z80 core helps too, as does ...
    Dunny Dunny July 2002 Emulators
  • What is a Kempston joystick?Just a quick question from an ignorant Commodore user (what, a Commodore user on this sacred ground? Relax, I'm a fan of all 8-bits, including the wo…

    ... all.

    On the Z80 you have a command to ... ) as its attached to the ULA.

    239 (0x00ef) and ... partially decoded, just like the ULA is on every even port ...
    Philip Kendall Philip Kendall September 2002 Sinclair Miscellaneous
  • My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …

    ... used into the new NC100 Z80 development system.[/quote]

    z80 opcodes require no translation - the ... sense to use a newer Z80 - they have new features, new ... /> GPU? Are you using the ULA or not? If you're ...
    cyborg cyborg October 2002 Sinclair Miscellaneous
  • Anyone got a copy of 'Z80 for primates'?This Z80 lark isnt easy, in fact it makes me feel very much like Washoe the chimp trying to learn learn sign language, I just dont think I've got the…

    ... sensible (for contention issues with ULA memory and all that if ... (which are just like the Z80's but refer to sound ... produce sound even when the Z80 isn't updating it's ...
    cyborg cyborg November 2002 Sinclair Miscellaneous
  • Fake screenshots? No - now it's REAL screenshotsOk then. A few weeks ago I said I will show You the new gfx-mode of Speccy and - here it is: [url="http://republika.pl/hooy_prg/hprg.zip"]http://rep…

    ... TAP into RealSpectrumEmulator, and use ULA FX Hardware Multicolour to display ... though :) at least you undertand Z80 and how spectrum functions as ... /> I understand a lot of Z80, but I?m not a ...
    LCD LCD March 2003 Sinclair Miscellaneous
  • Can somebody help me with this?One of my "friends" shoved a piece of metal into the back of my spectrum (48k RAM) and now whenever I try to use it theres nothing but weird lines an…

    ... ?6-7 - if the ULA and / or Z80 is blown then a ...
    GP GP April 2003 Sinclair Miscellaneous
  • Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…

    ... bus when the Z80 is looking for the ULA's identifier, the ... means the Z80 will consistently read '255' as the ULA's effective ... bus when the Z80 is looking for the ULA's peripheral ID ... ID provided to the Z80 for the ULA will be at all ...
    Alcoholics Anonymous Alcoholics Anonymous September 2003 Development
  • New SpeccyDo you think someone should go about creating a new spectrum computer? I'm talking about a spectrum compatible (not an emulator) with the capabiliti…

    ... of emulation abilities given the ULA is done by a PLD ... you couldn't have other Z80 based machines supported - the ZX80 ...
    cyborg cyborg September 2003 Sinclair Miscellaneous
  • an idea that could be very very good...but also very very bad...Hello all! I've been having a chat with some of my friends round here that once loved the spectrum (well...2...as they're all heathens round here...)…

    ... /> 2. Ever heard of the ULA ? Neither had I - then it ... not any of the other Z80 based machines(I'm sure ... working spectrum you need a ULA! The only way to solve ... GBA) and ... erm .... emulate the Z80.

    I'm fairly ...
    thingley thingley January 2004 Emulators
  • an idea that could be very very good...but also very very bad...Hello all! I've been having a chat with some of my friends round here that once loved the spectrum (well...2...as they're all heathens round here...)…

    ... more modern version of the z80 (EZ80) at 50mhz or so ... to use instead of the ULA (I believe I have seen ... lets you program a virtual Z80 on an FPGA as well ...
    b00mzi11a b00mzi11a January 2004 Emulators
  • an idea that could be very very good...but also very very bad...Hello all! I've been having a chat with some of my friends round here that once loved the spectrum (well...2...as they're all heathens round here...)…

    ... - the interaction between the ULA and the Z80 over the address bus ...
    BN^2 BN^2 January 2004 Emulators
  • an idea that could be very very good...but also very very bad...Hello all! I've been having a chat with some of my friends round here that once loved the spectrum (well...2...as they're all heathens round here...)…

    The (fabled) Petersplus Sprinter had ULA emulation in FPGA, and also ... the slightly different z80 than the memory contention or ULA. There aren ...
    b00mzi11a b00mzi11a January 2004 Emulators
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Latest Posts

  • Minor British Sports that did become games on the ZX Spectrum
    dmsmith on April 22
  • I bought an accoustic guitar. How do you play it?
    Maroc's Other Projection on April 22
  • Goodbye Z80
    moggy on April 22
  • Happy 40th Birthday to the Amstrad CPC464!
    AndyC on April 22
  • Another Birthday! The Game Boy Is 35!
    dm_boozefreek on April 22
  • I am currently watching.....
    Antiriad2097 on April 22
  • European Software Titles with an English version
    harriusherbartio on April 22
  • How Do You Categorize Your Speccy Software and Games?
    harriusherbartio on April 22
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on April 22
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21

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