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  • 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 …

    ... place 7ffd on the data bus to access the I/O ... (although the 'address on data bus' effect mentioned above complicates things ...
    Philip Kendall Philip Kendall May 2004 Emulators
  • ZX-BUS?Hmmmm..... While reading Your posts here, I have an impression that various models of ZX Spectrum have various zx-bus ports. Is that true? I knew t…

    I understand, thank You.
    How about Timex? (2048 of course)
    I suspect it has the same zx-bus like original Sinclair's machines.......?
    Or not? ;)
    Yerz Yerz May 2004 Sinclair Miscellaneous
  • 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…

    IIRC Cobra and Arkanoid will fail due to lack of floating bus.

    Several more will come to mind again given time...
    Woody Woody May 2004 Emulators
  • ZX-BUS?Hmmmm..... While reading Your posts here, I have an impression that various models of ZX Spectrum have various zx-bus ports. Is that true? I knew t…

    ... it has the same zx-bus like original Sinclair's machines ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Sinclair Miscellaneous
  • 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…

    ... doesn't have the floating bus. I have tried > 400 ... 't work because of floating bus + port conflict trouble. It reads ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Emulators
  • +D/Disciple games archive?Hi all, Having finally got my disciple to work, I'm starting to have a look at hacking multiload games. Is there any archive on the web with games t…

    ... the load was successful). The RST#18 is jlo's way ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Sinclair Miscellaneous
  • 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…

    Sidewize (floating bus again).

    Other than ...
    Philip Kendall Philip Kendall 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…

    ... and z80 data bus -- there's a '245 bus trasceiver in there ... has a resistor decoupled data bus to make it more compatible ...
    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…

    ... and z80 data bus -- there's a '245 bus trasceiver in there ... has a resistor decoupled data bus to make it more compatible ...
    Fred Fred May 2004 Emulators
  • ZX-BUS?Hmmmm..... While reading Your posts here, I have an impression that various models of ZX Spectrum have various zx-bus ports. Is that true? I knew t…

    ... . This is all about the bus, which is only slightly different ...
    wilsonsamm wilsonsamm May 2004 Sinclair Miscellaneous
  • 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…

    ... and z80 data bus -- there's a '245 bus trasceiver in there ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Emulators
  • Best clone to build ?I'm thinking of building a Spectrum clone but not sure what design that it's best to start from. I prefer to use only standard components and not …

    ... .

    - Use a passive bus backplane,8 or more slots ...
    pern pern June 2004 Sinclair Miscellaneous
  • Early Speccy Memories ThreadHiya. Right Ok. I want to start a thread going here and I want to know all about your early days with speccys. I am 31 now. I got involved with spec…

    ... shop in 'Accrington ' near the bus depot and swooning in amazement ... on the back of the bus on my travels home. There ...
    knightlore71 knightlore71 July 2004 Games
  • 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…

    What about the expansion bus? Is the good old Z80 bus edge interface on the pipeline, or something more of the style of Sami Vehmaa's ZXBUS?([url]http://user.tninet.se/~vjz762w/[/url] )

    /Pedro
    pmsr pmsr 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…

    ... and have an original Spectrum Bus slot

    2: Use ... slot. But access to the bus is a must. But that ...
    pern pern 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…

    ... ? Like those with VG64/96 bus connectors on backplane?

    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…

    ... ]

    And for the bus this:
    [url="http://www ... ? Like those with VG64/96 bus connectors on backplane?
    [/quote ...
    pern pern July 2004 Sinclair Miscellaneous
  • Hardware section....Wonder why here is no specific hardware forum??? No one ever touched a soldering iron here? (o; I'm kinda lost here with my hardware stuff under: "…

    Just one connector/Bus interface for all models ?
    < ...
    pern pern July 2004 Sinclair Miscellaneous
  • Another Z80 processor questionOK, this time this isn't clearly covered in the FAQ, as far as I can see.... Suppose we have the CB instruction "SET b,r" (b=bit, r=register (differ…

    ... in ultra-precise stuff (floating bus, contended memory), but I want ...
    GOC GOC 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…

    ... PIO by scanning the data bus can tell that the interrupt ...
    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…

    According to Programming the Z80 RST instructions take 11 T states. 2 T states are added to M1 if /INT is present. Where do you think this is wrong?
    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…

    An unconditional RET takes 10 tstates. Check your source.

    Edit: Read the post, you idiot :) RET != RST.

    [ This Message was edited by: Philip Kendall on 2004-07-30 23:57 ]
    Philip Kendall Philip Kendall 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…

    ... /> According to Programming the Z80 RST instructions take 11 T states ... T states are added. A "RST n" instruction does indeed take ... cycles, the peripheral supplies the "RST n" opcode. This is followed ...
    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…

    ... PIO by scanning the data bus can tell that the interrupt ...
    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…

    ... 8-bit vector on the bus. Presumably it does this with ... an instruction opcode on the bus is a similar task. Probably ...
    Fraser Fraser July 2004 Development
  • Mysterious bit of codeHi everyone, I found the follow piece of code in a game and was wondering what it does. ld bc,40ffh ld e,40h loop ld a,r …

    You may wish to see Ramsoft's "Floating Bus Explained" document for a thorough explanation of what's going on with reads from unattached ports.
    Philip Kendall Philip Kendall 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…

    ... the state of the data bus is fought over. Strongest drivers ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Development
  • 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…

    ... not put garbage on the bus during an interrupt acknowledge, so ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Development
  • A few questions regarding EmuZwinI had posted this in the development forum and then remembered there was an emulators forum, so apologies for the repetition. 1. I have been trying …

    ... />
    [quote]
    4. Floating Bus implementation. I use this to ... test an emulator's floating bus emulation accuracy using Ramsoft's ...
    Woody Woody August 2004 Emulators
  • AmericaI've been wondering, was the Spectrum released in America? Was it popular? Are there Spectrum games that were made in America? There must be a few A…

    ... was never available, the BEU (bus expansion unit) was to allow ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Games
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