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<1…15161718192021…34>
  • +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
  • 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 ?
    -------------
    Yes. This ... (quite easily) to change/replace ULA to some modern electronic stuff ... GBA) and ... erm .... emulate the Z80.
    ---------
    Yes, I ... be enough to use new Z80 CPU and it would work ...
    Yerz Yerz January 2004 Emulators
  • New project for 256 colours Games emulator!O.K. , I suggested Jonathan Needle ( Creator of the excellent Spectaculator at [url="http://www.Spectaculator.com"]www.Spectaculator.com[/url] ) to c…

    ... sure about this "64-bit Z80" stuff either. I'd just ... display (and back to the ULA if necessary).

    Porting ...
    Jon Needle Jon Needle January 2004 Emulators
  • New project for 256 colours Games emulator!O.K. , I suggested Jonathan Needle ( Creator of the excellent Spectaculator at [url="http://www.Spectaculator.com"]www.Spectaculator.com[/url] ) to c…

    ... NEW REPAINTED GRAPHICS WHICH THE Z80 AND ULA KNOW NOTHING ABOUT !!! That ...
    Arm73 Arm73 January 2004 Emulators
  • C64 & Spectrum loadingscreens!I was bored today, so I decided to compare some stuff. :) [url="http://www.lemon64.com/loadingscreens/"]http://www.lemon64.com/loadingscreens/[/ur…

    ... enough - with a faster Z80 it would be possible.

    Not true: the ULA grabs entire bytes (it does ... I would guess that the ULA accesses the video memory in ... I would bet that the ULA does this, quickly reading ... is that once the ULA decides to draw a ...
    Alcoholics Anonymous Alcoholics Anonymous February 2004 Games
  • Any Errors?Any errors you feel Sinclair Research or even Amstrad made with the speccy??

    ... ' interrupts (those generated by the ULA every 69888 tstates) are disabled ... IFF1).

    When the Z80 receives an NMI, it immediately ...
    Philip Kendall Philip Kendall March 2004 Sinclair Miscellaneous
  • Any Errors?Any errors you feel Sinclair Research or even Amstrad made with the speccy??

    ... ' interrupts (those generated by the ULA every 69888 tstates) are disabled ... IFF1).

    When the Z80 receives an NMI, it immediately ...
    monty.mole monty.mole March 2004 Sinclair Miscellaneous
  • Any Errors?Any errors you feel Sinclair Research or even Amstrad made with the speccy??

    ... ?[/quote]

    RAM, Z80 and ULA have got to be the ...
    cyborg cyborg March 2004 Sinclair Miscellaneous
  • SpecEmu 2.1 betaFinally I think I've cracked all the gory contention details required by those trendy multicolour demos (48K/128K modes only, +3 contention can wait …

    ... 2., as I can understand, ULA makes an I/O (more ... this could make conflict while ULA reads video buffer. So, I ... the official Zilog documentation on Z80 processor, the instruction "out (c ...
    Vladimir Kladov Vladimir Kladov May 2004 Emulators
  • SpecEmu 2.1 betaFinally I think I've cracked all the gory contention details required by those trendy multicolour demos (48K/128K modes only, +3 contention can wait …

    ... as I can understand, ULA makes an I/O ... could make conflict while ULA reads video buffer. So ... an effect because the Z80 must place 7ffd ... contended memory to the ULA... the details Woody posted ... official Zilog documentation on Z80 processor, the instruction "out ...
    Philip Kendall Philip Kendall May 2004 Emulators
  • replacement ear and mic sockets on a spectrum+...ok, i bought a spectrum recently in an 'as seen' condition, so i suppose i have no right to complain because it isn't working... in any case, i was…

    ... /> You can also get:
    -Z80 cpu, memory chips, ROM, membranes ... , Modulator very easily.
    ULA may be more difficult tho ...
    thomas3120 thomas3120 May 2004 Sinclair Miscellaneous
  • MC 101Hello Group Members: Can't spectrum MC be embedded in a BASIC program

    ... is contended, meaning the ULA and Z80 compete to access memory in ... that area. The ULA always wins ... in the TV, so the Z80 will be slowed down. Any ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Development
  • Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…

    ... most commonly read to read ula screen bytes as the display ... data lines to separate the ula and z80 data bus -- there's ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Emulators
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