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<1…16171819202122…34>
  • 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
  • UncontendedThis may be a real daft question as I consider myself to be a bit of a programmer, but &lt;deep intake of breath> here goes... When refering to memo…

    It means the Z80 isn't fighting with the ULA for access to the memory.
    cyborg cyborg February 2005 Development
  • 128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…

    ... up from the Z80 to the RAM. Since the ULA doesn't ... need the Z80 to fetch memory ...
    cyborg cyborg February 2005 Development
  • 128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…

    ... 'm confusing a ULA memory read with a Z80 memory read.
    The Z80 reads the first ... it via Memory[16384]. The ULA does the same thing but ... least 7 tstates but the ULA can load a screen attribute ...
    Unique Unique February 2005 Development
  • 128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…

    ... m confusing a ULA memory read with a Z80 memory read.< ... br /> The Z80 reads the ... via Memory[16384]. The ULA does the same thing but ... each other for the ULA and Z80. Connect the buses differently ... 7 tstates but the ULA can load a screen ...
    cyborg cyborg February 2005 Development
  • InterruptsCan someone help with providing some info or a link about IM 2. I know I need to create a vector table and want to store this as high in memory as po…

    ... read and CALLed by the Z80.

    Effectively, ... br /> On the Spectrum, the ULA is not an im2 aware ... In that case, the z80 reads whatever is floating on ... fe. This means that the z80 will *always* call address ... and this fools the ula into thinking there is ...
    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • Hypersports problem - freezes before 1st event?I am using Fuse on Mac OSX, have tried a few of the available Hypersports in the archive now, but each one appears fine until I start the first event…

    ... "tstates < 48" test in z80/z80.c:z80_interrupt() to (say) "tstates ... value for how long the ULA holds /INT low for on ...
    Philip Kendall Philip Kendall February 2005 Games
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... likely to be a dead ULA, dead Z80 or dead lower 16K ...
    Spirantho Spirantho June 2005 Sinclair Miscellaneous
  • Investronica Inves Spectrum +Hi, Has anyone here ever heard of the Investronica Inves Spectrum +? This site [url="http://www.silicium.org/uk/sinclair/inves.htm"]http://www.sili…

    ... in Sinclair Spectrum + computers. The Z80 CPU was made by Zilog ... be easily modified. Also, the ULA was vastly enhaced, and developed ... which is divided for the ULA and the CPU.

    na_th_an na_th_an June 2005 Sinclair Miscellaneous
  • "Sinclair Zx Spectrum: Absolutely Better Than Commodore 64"Did you ever read this? [url="http://www.alfonsomartone.itb.it/fztsmo.html"]http://www.alfonsomartone.itb.it/fztsmo.html[/url]

    ... together a Z80, a bit of RAM and the ULA. You may ...
    Fr?hn Fr?hn July 2005 Games
  • "Sinclair Zx Spectrum: Absolutely Better Than Commodore 64"Did you ever read this? [url="http://www.alfonsomartone.itb.it/fztsmo.html"]http://www.alfonsomartone.itb.it/fztsmo.html[/url]

    ... together a Z80, a bit of RAM and the ULA. You may ...
    rich_chandler rich_chandler July 2005 Games
  • Help! +3 won't work anymore!I've just set up my old +3 and it just won't work - it used to a few months ago but now it won't :( I'm in need of some expert help so here's the pr…

    ... /> - rom chips were okay
    - z80 cpu was okay
    - keyboard ... myself think it is either ULA (you cannot replace easily) or ...
    Timppa Timppa August 2005 Sinclair Miscellaneous
  • Help with +3 in comaHi everyone Had a spectrum +3 under the bed for some time and when replacing its drive i accidentally connected the 5v and the gnd of the led. Now…

    ... ] more likely to be the ULA, in which case it's ... motherboard time, or hopefully the Z80, in which case it's ... former more likely to be ULA, yes.

    Here's ...
    Spirantho Spirantho August 2005 Sinclair Miscellaneous
<1…16171819202122…34>

Latest Posts

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    harriusherbartio on April 22
  • Fixed Speccy Software. And which games remained unfixed?
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  • New video about S-video modification on Issue two 48K Spectrum.
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