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<1…16171819202122…34>
  • 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
  • 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 ...
    Fred Fred May 2004 Emulators
  • 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…

    ... data lines to separate the ula and z80 data bus -- there's ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Emulators
  • Expanded Profiles - Brief BiosExpanding on the post about Crimewatch style profiles, why not make a biography style profile. And I'll be the first... NAME: Patrick J.K. Furlong A…

    ... time. So they bought chips (Z80, ROM chip, RAM chips and ... lots of chips which emulate ULA), made a boards and assembled ...
    kmatveev kmatveev July 2004 Sinclair Miscellaneous
  • Expanded Profiles - Brief BiosExpanding on the post about Crimewatch style profiles, why not make a biography style profile. And I'll be the first... NAME: Patrick J.K. Furlong A…

    ... time. So they bought chips (Z80, ROM chip, RAM chips and ... lots of chips which emulate ULA), made a boards and assembled ...
    Sharopolis Sharopolis July 2004 Sinclair Miscellaneous
  • Expanded Profiles - Brief BiosExpanding on the post about Crimewatch style profiles, why not make a biography style profile. And I'll be the first... NAME: Patrick J.K. Furlong A…

    ... time. So they bought chips (Z80, ROM chip, RAM chips and ... lots of chips which emulate ULA), made a boards and assembled ...
    mel the bell mel the bell July 2004 Sinclair Miscellaneous
  • ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…

    ... contains:

    FPGA: EP1C6T144C8 (Z80, ULA, Joystick)
    Flash: 512KByte 29LV400TC ...
    klingler klingler July 2004 Sinclair Miscellaneous
  • ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…

    ... />
    [quote]
    FPGA: EP1C6T144C8 (Z80, ULA, Joystick)
    Flash: 512KByte 29LV400TC ...
    pern pern July 2004 Sinclair Miscellaneous
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... is generated by the ULA every 69888 tstates, which ... , the ULA pulls the /INT pin on the Z80 low. ... />
    Internally, the Z80 divides every opcode into M ... routine finishes before the ULA has pulled /INT high ... )

    The Z80 has a second interrupt, the ...
    Fraser Fraser July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... every every instruction, the Z80 will sample the /INT ... straight out of the Mostek Z80 manual.

    ... in agreement with the Mostek Z80 manual.

    ... routine finishes before the ULA has pulled /INT high ... finished just as the ULA pulled /INT low, ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    Considering the plain Z80, RET and RETI works exactly ... no use for ending the ULA generated interrupt by RETI.
    Mikie Mikie July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... wrote:
    Considering the plain Z80, RET and RETI works exactly ... no use for ending the ULA generated interrupt by RETI.
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • Strange layout of Spectrum video memoryHello, does anyone have an idea why the Spectrum's video memory has such a strange layout? I understand that a resolution of 256x192 is an easy mean…

    ... makes sense. According to Zaks' Z80 book, incrementing H is 1 ... is higher complexity in the ULA while generating the TV picture ...
    J?rg Pleumann J?rg Pleumann August 2004 Sinclair Miscellaneous
  • 2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…

    ... Spectrum, though, the ULA is decoupled from the Z80 with resistors. Peripherals ... back are connected on the Z80 side of the resistors, so ... will always win against the ULA. Mileage will vary with different ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... the z80 happens to access the same memory the ULA needs to ... access to generate the video, the z80 is ... briefly halted by stopping its clock while the ULA ... memory region where the z80 and ULA might simultaneously access is called ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Development
  • can I ear the loading sound while loadind a .tzx in zx 32?can I ear the loading sound while loadind a .tzx in zx 32? if so please tell me how tanx

    ... the way of accuracy for z80/ula contention (it barely renders a ...
    Dunny Dunny August 2004 Emulators
  • Why relativly bad colour on Spec compared to other 8bit?Why relatively bad colour on Spec compared to other 8-bit machines like the Master system or even c64? I understand the 8x8 block that you could hav…

    The PC-Engine had several other processers working PURELY just to output graphics and sound. The Spectrum had it's Z80 CPU, the ULA and a Beeper. THis is where the differences lie.
    b00mzi11a b00mzi11a September 2004 Games
  • Fuse 7.0 installJust installed slackware 10, and now having trouble installing Fuse, or rather libspectrum, haven't got to the fuse part yet. Missing a library some…

    ... .o ui.o uidisplay.o ula.o utils.o zxatasp.o ... /libscaler.a debugger/libdebugger.a z80/libz80.a -l765 -ldsk -lspectrum ...
    dasteph dasteph December 2004 Emulators
  • Fuse 7.0 installJust installed slackware 10, and now having trouble installing Fuse, or rather libspectrum, haven't got to the fuse part yet. Missing a library some…

    ... .o ui.o uidisplay.o ula.o utils.o zxatasp.o ... /libscaler.a debugger/libdebugger.a z80/libz80.a -l765 -ldsk -lspectrum ...
    Philip Kendall Philip Kendall December 2004 Emulators
<1…16171819202122…34>

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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