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<1…12131415161718…34>
  • Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…

    ... is part of the ULA and the ULA is contended.

    ULA+ ports...[/QUOTE]

    Well ... any software that required precise timing at the time it wasn ... changes to figure out the timing for HAM256 as I didn ...
    chev chev May 2014 Emulators
  • Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…

    ... book, 'The ZX Spectrum ULA: How to Design a Microcomputer ... When drawing the screen, the ULA reads four bytes of memory ... addressing constraint imposed by the ULA and the DRAM refresh ... — possibly the best — between the timing requirements for burst mode reads ...
    zub zub May 2014 Sinclair Miscellaneous
  • Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…

    ... 's version of the Sinclair ULA.

    [url]http://3 ... . The section on contended memory timing also applies to the TC2068 ...
    rga24 rga24 May 2014 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... spectrum with an internal ULAplus ULA fitted ie double contention. :o ... those switched on, super-accurate timing wouldn't really matter all ...
    Basher Basher May 2014 Hardware
  • HDMI generation by cloning video ram(coming from [url]http://www.worldofspectrum.org/forums/showthread.php?p=768257&posted=1#post768257[/url]). A thing I was brainstorming about.. Why …

    ... /> No more need for a ULA ;)[/QUOTE]

    Well, that ... have to synch with the timing.
    BUT, if you made ... ULA plus palette and multicolour, and 128K paging, then maybe the timing ... , if you do ignore the timing - even if you're in ...
    joefish joefish May 2014 Hardware
  • Dot crawl?Hi, As I'm rather new to the hardware of the spectrum, just to confirm: is this video showing "Dot crawl" ? [url]https://www.youtube.com/watch?v=_U…

    ... the video signal from the ULA to the SPECTRA, the SPECTRA ... for synchronization) and slight timing variations in the ULA.

    It ...
    1024MAK 1024MAK June 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... approximation of what a distorted ULA clock output may be like ... performance of interfaces where the timing is critical.

    [I ...
    1024MAK 1024MAK June 2014 Hardware
  • ZXDS 1.3.0Hello, I am really glad I can announce one more [URL="http://zxds.raxoft.cz"]ZXDS release[/URL] on this special day. The major new feature is the lo…

    ... I was using for standard ULA, and the slowdown was noticable ... incorporate the accurate +3 ULA screen switching timing for +2A/+3 and ... improved Pentagon screen timing, too.

    [QUOTE=slenkar ...
    Patrik Rak Patrik Rak July 2014 Emulators
  • z80 commands timeshi! I need site with z80 commands mashine times. I remember, I saw one as table, maybe in .cc domain, but pity forgot link. for example LDI take 16 …

    ... shows real instruction breakdown under ula contention, it also teaches you ... sheet when working under critical timing:

    [url]http://www ...
    Arda Arda July 2014 Development
  • z80 commands timeshi! I need site with z80 commands mashine times. I remember, I saw one as table, maybe in .cc domain, but pity forgot link. for example LDI take 16 …

    ... shows real instruction breakdown under ula contention, it also teaches you ... sheet when working under critical timing:

    [url]http://www ...
    MatGubbins MatGubbins July 2014 Development
  • Crowdfunding ULAs?Hi everybody, I've found someone who's willing and able to make another production run of the Plessey ULA6C001E-7. We're not talking small amounts …

    ... drop-in replacement for the ULA to look perfectly original). ... mcleod_ideafix has already shown a ULA (including ULA+) which plugs into the ... demonstrated a standard and timing perfect ULA that fits in a ... right into the Spectrum's ULA socket.

    You ...
    Winston Winston July 2014 Hardware
  • ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…

    ... 's just struck me - the ULA in that machine is a ... in reverse engineering the Spectrum ULA into a [URL="http://www ... this working - there may be timing differences that may be of ...
    balford balford July 2014 Hardware
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... connector. I plan to reimplement ULA+ and the every ink pixel ... relax the frame-generation │
    │ timing requirement of the parent object ...
    Basher Basher August 2014 Hardware
  • The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…

    ... my Quest for the Holy ULA, and have today taken delivery ... access wrong. I suspect a timing issue, perhaps what they fixed ... . You have to match the ULA to the motherboard. At a ...
    chev chev August 2014 Hardware
  • 'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…

    ... 5C112E and 6C001E-5/6 ULA's, and the 6C001E ... suitable replacement for all earlier ULA types.

    Some ... with the issue 1 5C102E ULA :)

    Anyhow, ... point, a 6C001E-6 ULA can be tested in an ... but may exhibit memory access timing issues in a 4A ...
    balford balford September 2014 Hardware
  • 'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…

    ... 5C112E and 6C001E-5/6 ULA's, and the 6C001E ... suitable replacement for all earlier ULA types.

    Some ... with the issue 1 5C102E ULA :)

    Anyhow, ... point, a 6C001E-6 ULA can be tested in an ... but may exhibit memory access timing issues in a 4A ...
    HZJ HZJ September 2014 Hardware
  • Sinclair Today...Based on your experiences and knowledge of how Sinclair Research operated back in the 1980s, if they were to announce a new Sinclair branded PC or La…

    ... (standard screen image size and timing). So that the same monitors ... 32k byte). But the video ULA would have been the problem ...
    1024MAK 1024MAK September 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... are we actually testing the timing/speed?
    If ... then enables the CPU timing/speed to be checked. ... are derived from the ULA internal clock circuit, which ... 14MHz crystal or the ULA's internal clock and ...
    For a true timing test, a real external clock ...
    1024MAK 1024MAK November 2014 Hardware
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... (related to the moment the ULA triggers the INT line, which ... ]

    Yes. Read section "TIMING" in the [URL="http://www ...
    Einar Saukas Einar Saukas November 2014 Development
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... will usually single out the ULA as being what makes it ... the exact die of the ULA chip for it to be ... usually operate with the same timing, and include many of the ...
    RobeeeJay RobeeeJay November 2014 Hardware
  • What is the Speccy? exUSSR edition.In exUSSR 8 years ago have been solved all these issues, and developed a General opinion. All who do not agree with this opinion, are incompetent peo…

    ... reverse-engineered clone of the ULA. Main differences where slightly improved ... (including additional commands), different CPU timing (usually 60Hz instead of 50Hz ...
    Einar Saukas Einar Saukas November 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... gate array (call it a ula) or onto bare silicon using ... . On all of them, the timing can be constrained to be ... implementation cannot meet the same timing, it cannot be measured for ... an FPGA replacing the Sinclair ULA, all the things we care ...
    Alcoholics Anonymous Alcoholics Anonymous November 2014 Hardware
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... , Sinclairean emulator, which passes both Timing test and Woody test suite ... features is support for undocumented ULA artefacts (four bright shades), which ... , SpecEmu 3.1 can pass Timing Test with 100% accuracy, but ...
    Pegaz Pegaz November 2014 Emulators
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... test 35 as long as ULA+ is disabled, and it passes ... is to test the contention timing, not the emulation of peripherals ... subsequent INs and thus the timing at all. I guess I ...
    Patrik Rak Patrik Rak November 2014 Emulators
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... test 35 as long as ULA+ is disabled, and it passes ... is to test the contention timing, not the emulation of peripherals ... subsequent INs and thus the timing at all. I guess I ...
    Richard_Butler Richard_Butler November 2014 Emulators
  • Non-Ferranti ULA 6C001E-7?Hello! I don't like Iss2 boards that much but after revising one Speccy like that for a friend, the results were so positive that I decided to have …

    ... -7 ULA to match improvements in RAS/CAS memory signal timing on ...
    balford balford December 2014 Hardware
  • ZXDS 1.3.0Hello, I am really glad I can announce one more [URL="http://zxds.raxoft.cz"]ZXDS release[/URL] on this special day. The major new feature is the lo…

    ... I was using for standard ULA, and the slowdown was noticable ... incorporate the accurate +3 ULA screen switching timing for +2A/+3 and ... improved Pentagon screen timing, too.

    Patrik[/QUOTE ...
    polomint polomint December 2014 Emulators
  • DivMMC Enjoy - I'm not enjoying it!My DivMMC Enjoy arrived today. Excitedly I rushed home to plug it into my +2a. I have quite a few SD card/CF solutions for my computers so I know wha…

    ... ] This one had a busted ULA and some corrosion. After replacing ... the ULA the board worked ok and ... get deep into studying datasheet timing diagrams to see if we ...
    guesser guesser February 2015 Hardware
  • You get what you pay for-You live and learnDecided to try for a cheap spectrum + on ebay described as not being able to tune it and some keys did not work - haha Duly received and opened up a…

    If it is the ULA, you might find that it' ... no longer producing proper read timing for the old 4116 RAM ... zx.zigg.net, or that ULA might simply work fine in ...
    balford balford February 2015 Hardware
  • Video ZX Spectrum+ 48k<span>Good day ... is a bit of time that I try to fix my zx spectrum ... I replaced the ram 4116, all electrolytic capacitors ... but the monitor loo…

    ... indicates an issue with the ULA's ability to access memory ... the new RAM is more timing sensitive than what was originally ... may find that a replacement ULA will cure things, or the ...
    balford balford May 2015 Hardware
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