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  • Would anyone be interested in......Hi, I'm wondering if there would be much interest in an expansion card for the speccy that gives a VGA output with enhanced gfx & sound capabilities…

    ... % compatible things such as the ULA+ palette tweaking, Kempston mouse, joysticks ... to accurately mirror the raster timing or a lot of games ...
    joefish joefish February 2012 Hardware
  • Would anyone be interested in......Hi, I'm wondering if there would be much interest in an expansion card for the speccy that gives a VGA output with enhanced gfx & sound capabilities…

    ... going to have to be timing correct with the scan, as ... RAM maybe, and VGA, maybe ULA+, ROM switching maybe?
    Baggers Baggers February 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... improvement and tweaking of the ULA design, particularly the IO, ... delay of the 5C ULA was different to the ... would affect the RAS CAS timing, and those tweaks across ... are very tight from the ULA. From my memory, data ... is latched by the ULA at the rising edge of ...
    csmith csmith February 2012 Hardware
  • Precisely timed loops in assemblyI'm looking for a way to make my code stop until the raster has reached the lower screen border (right after having drawn the last pixel line). I und…

    ... [B]Fikee[/B] has linked, timing varies between 48K, 128K, +2A ... a Pentagon (which has no contention) or a real Speccy. Then ...
    joefish joefish February 2012 Development
  • SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…

    ... .5MHz Z80 core with memory contention and other artifacts can be ... to their own thread (CPU, ULA, video processor, peripherals) and I ...
    kphair kphair March 2012 Emulators
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... corruption. With a 6C ULA temporarily installed in place ... the ULA captures invalid or incorrect data. Slight timing differences ... between the ULA types mean this ... what the RAM access timing differences are between the ...
    Zorn Zorn March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... 've been looking at CPU timing diagrams and the SRAM datasheet ... circuit, I can narrow the ULA's write pulse by quite ...
    Zorn Zorn March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    If above timing diagram is accurate, [I] ... tried that have a 6C ULA.[/QUOTE]
    Have you ... exact circuit with a 5C ULA? Just guessing, but I ... as quickly as possible after ULA /RAS going low). And ... up effect of ULA's /CAS or /WE timing.
    [*]Relatively ...
    RetroTechie RetroTechie March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    [QUOTE=RetroTechie;610104]If above timing diagram is accurate, [I] ... correct for a 5C ULA and that's probably ... exact circuit with a 5C ULA?
    [/QUOTE]
    I ... inverter with a 5C ULA and the result is ... 4 and above. The ULA access timings shouldn't depend ...
    Zorn Zorn March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... because delays (mainly in the ULA) change as it warms up ... is clearly right on the timing boundary between working and not ... some real timing measurements from a 5C and 6C ULA with my ...
    Zorn Zorn March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... do that for a 6C ULA.

    I'm still ... on trying to create detailed timing diagrams for the different ULAs ...
    Zorn Zorn March 2012 Hardware
  • ZXDS 0.9.3 beta 1Hello, Today it's exactly five years since the [URL="http://zxds.raxoft.cz"]ZXDS[/URL] has come to life on my DS. To celebrate this anniversary, I h…

    ... different hw communication, different hw timing, different interrupt handling, different bios ... interesting are:

    1) ULA+ support
    2) Microdrives
    Paddy Coleman Paddy Coleman March 2012 Emulators
  • New software screenmode: aSmpI was planning to release this tool at Forever XIII, but they didn't accept it, this is my 30th year activity, my most ambitious work on zx spectrum …

    ... already supports 128k and +3 ula contention timings. I wanted to show ...
    Arda Arda March 2012 Announcements
  • BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…

    ... 88 KHz. I not add contention of ULA in this test, it ...
    Z80user Z80user April 2012 Emulators
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ...
    Machine type: +3
    Contention offset: 0x08

    BIT ... memory... passed
    High port contention 1... passed
    High port ... contention 2... passed
    0x3ffd read... ... it my +3 a "late timing" exemplar then?
    Alessandro Grussu Alessandro Grussu April 2012 Emulators
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ... screen:
    [INDENT]
    [...]
    Contention offset: 0x08
    [...]
    [/INDENT ... regard that as an "early timing" machine. I guess the test ... various emulators with early/late timing settings and see what they ...
    Philip Kendall Philip Kendall April 2012 Emulators
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ... " mode?
    [/QUOTE]

    Contention offset is 0x08 in Spectaculator ... in both late and early timing modes for the +3.
    Arjun Arjun April 2012 Emulators
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ... Windows) configured for non-late timing: 1+3 only
    [*] ... (for Windows) configured for late timing: 2+3 only
    [*] ... /2012 configured for non-late timing: 1+4 only
    [*] ... memory contention properly, so I doubt it emulates interrupts and border timing ...
    Einar Saukas Einar Saukas April 2012 Emulators
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ... emulators with early/late timing settings and see what ... here[/URL]) to measure "contention offset" on a few emulators ... 1.0a: complains about "negative contention" :)
    [/LIST]
    ... measure contention properly, and Spectrum +3 with late timing actually ...
    Einar Saukas Einar Saukas April 2012 Emulators
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ... 's +2A emulation with correct timing. I think SpecEmu is also ... should get glitching on a ULA 128, but not on an ...
    chev chev April 2012 Emulators
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ... here[/URL]) to measure "contention offset" on a few emulators ... measure contention properly, and Spectrum +3 with late timing actually ... 3 are always non-late timing, but emulators don't ... confident about fusetest's contention measurements than about emulators ...
    Philip Kendall Philip Kendall April 2012 Emulators
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ... there are no "early timing" and "late timing" Spectrum +3, but ... have correct timing for memory contention but wrong timing for border ... behave according to "early timing" Spectrum +3 settings in ... but border according to "late timing" Spectrum +3 settings in ...
    Einar Saukas Einar Saukas April 2012 Emulators
  • Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…

    ... emulators have correct timing for memory contention but wrong timing for border only ... would behave according to "early timing" Spectrum +3 settings in emulators ... , but border according to "late timing" Spectrum +3 settings in emulators ...
    Woody Woody April 2012 Emulators
  • BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…

    ... ;623260]so who's arguing? ULA+ maybe a good solution, but ... 't remove contention. If you're going to replace the ULA, which ...
    chev chev April 2012 Announcements
  • BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…

    ... not hard to do a timing Spectrum 128[/QUOTE]
    Yes ... wouldn't because the Spectrum ULA only updates the border every ...
    ccowley ccowley April 2012 Announcements
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... design of the spectrum ULA, and get the timing right, once and ...
    csmith csmith May 2012 Hardware
  • ZXDS 0.9.9 beta 1OK kids, here we go: Let me announce the latest and greatest [URL="http://zxds.raxoft.cz"]ZXDS release[/URL]. Mouse emulation, tape recording, stats …

    ... video or hardware enhacements (like ULA+, or Sam Coupe, or those ... with just slightly different screen timing and builtin Beta Disc tacked ...
    Patrik Rak Patrik Rak May 2012 Emulators
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... design of the spectrum ULA, and get the timing right, once and ... perfect timing accuracy.

    After you reverse engineered the ULA and ...
    antoniovillena antoniovillena May 2012 Hardware
  • SPECTRUM command and 48 BASICAs we (almost) all know, when a young Rupert Goodwins redesigned the Sinclair/Investronica ZX Spectrum 128 ROM 0 in late 1985, he kept the SPECTRUM c…

    ... run on the ULA 128s. There may be some timing issues, but ...
    chev chev May 2012 Sinclair Miscellaneous
  • SPECTRUM command and 48 BASICAs we (almost) all know, when a young Rupert Goodwins redesigned the Sinclair/Investronica ZX Spectrum 128 ROM 0 in late 1985, he kept the SPECTRUM c…

    ... run on the ULA 128s. There may be some timing issues, but ...
    BiNMaN BiNMaN May 2012 Sinclair Miscellaneous
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