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<1…11121314151617…34>
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... behave exactly as the original ULA does.[/QUOTE]
    Sorry, it ... changed the approach to my timing codes and have done some ... . Or, just maybe, my former timing codes were sloppy and somehow ...
    introspec introspec August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... . Or, just maybe, my former timing codes were sloppy and somehow ... 48K Spectrum with the original ULA, it should work in the ...
    mcleod_ideafix mcleod_ideafix August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... ' and 'late' timings on the ULA models. These should really be ... ' and 'hot' timings as all ULA models behave with 'early' timings ... .

    Thinking about these timing variations is the only time ...
    introspec introspec September 2013 Development
  • What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…

    ... ; set border
    out (ula), a ; to black
    ... address
    in a, (ula) ; read ULA
    rra ; rotate
    ld b, 201 ; timing constant
    call ld_edge_1 ; consider ... key row
    in a, (ula) ; 0x7ffe
    rra ; ...
    chev chev October 2013 Development
  • LOOK at the size of my Rom/EmulatorOk, we have 16k, 48k, 128k, even a 256 odd k Rom/Emulator But I want more :p Is there anything out there now or been worked on to give more, as the…

    ... infamous doohickie referred to as [timing] "contention" all aboot, eh?
    ULA and the Z80 processor can ... the same time so the ULA gets preference, this slows things ...
    rich_chandler rich_chandler October 2013 Sinclair Miscellaneous
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ...
    be_h_and_l_lp:
    dec c ; timing loop
    jr nz, be_h_and_l_lp ... B
    ld c, 63 ; timing constant
    jp nz, be_h_and_l_lp ... ; toggle bit 4
    out (ula), a ; write port
    ld ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... :
    djnz sa_leader ; timing loop
    out (ula), a ; write port
    djnz sa_sync_1 ; timing loop
    out (ula), a ; write port
    djnz sa_sync_2 ; timing loop
    out (ula), a ; write port
    chev chev October 2013 Development
  • Nasty 'Gotcha' for multicolour timingI thought I would be better developing my multicolour routine on the 48K first, being the slowest, so it would then be sure to work on the 128K varia…

    ... it was using the opposite timing pattern to whatever the emulator ... thought the timing differences were well understood now: As the ULA heats ... apply heat directly to a ULA to find out though, and ... willing to risk destroying a ULA for that particular test. Where ...
    chev chev October 2013 Development
  • Timex 2068 hi-color / hi-res modes.Hello. I know this is not a Timex forum but since it is a very close relative of the Speccy I thought I'd ask my question here. Does anyone know …

    ... ULA very compatible with the Spectrum?[/quote]In practice there were timing ... differences because the original ULA uses a ... 2068's equivalent of the ULA) with the same timings, ... for the standard Speccy ULA.[quote]I thought the ...
    chev chev November 2013 Sinclair Miscellaneous
  • Two more faulty onesCould I get your opinion on these two faults, please? Understanding these two cases would be very beneficial for my ZX education. Thanks! - A Spectr…

    ... :

    [QUOTE]
    The ULA cleaned up the earlier I ... the issue 2 5C112E ULA and altered the timing of the colour ... =1]Chapter 24. ULA Versions, section "Issue 3 ULA 6C001E-6", p ...
    balford balford November 2013 Hardware
  • Overclock the Z80 cpu to smooth out gameplay?Was thinking today of a Genesis/Megadrive mod I did a while back. It involved lifting the CLK leg on the motorola 68000 cpu (which in the MD, if I r…

    ... . CPU clock and video timing (realized by the ULA chip) are special ... source than that of the ULA even if it would be ... . The RAM chips and the ULA chip maybe damaged by such ...
    ingo ingo November 2013 Hardware
  • Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…

    ... logic, or another ULA if implemented in a ULA). Memory protection in ... lot of space in a ULA (and lots of PCB space ... of extra logic, memory and timing room, so I didn't ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Sinclair Miscellaneous
  • ZXDS 1.1.0Hello, once again a [URL="http://zxds.raxoft.cz"]new ZXDS version[/URL] is out. The major changes are the custom ROM support and Beta 48 emulation, …

    ... had any news on adding ULA+ support as I would love ... really like to see is timing accurate +2A support.

    chev chev December 2013 Emulators
  • Homebrew ZX Spectrum kits for DIY builders !Hi. I'm considering selling Homebrew ZX Spectrum kits on ebay... hopefully at a low price ! They'd consist of : Z84C0020PEC Z80 CPU …

    ... they'd squeezed the Spectrum ULA into just under 120 macrocells ... is it actually timing compatible with the original ULA? I suppose it ... flash devices)

    The ULA doesn't have any DRAM ...
    Winston Winston January 2014 Hardware
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    ... versions of the Spectrum 48K ULA:

    [LIST]
    ULA (Issue 2 boards).
    timing for increased compatibility with certain ... on the timing changes incorporated into the 6C001E-7 ULA.
    ...
    balford balford March 2014 Hardware
  • New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …

    ... machine uses the late CPU timing.
    EDIT: actually, see later ... this is in fact early timing.

    [QUOTE]
    ptime ... is to verify that the ULA fetches the pixels first and ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …

    ... attribute fetch goes unnoticed and ULA always fetches the pixels from ... due to subtle timing differences, or because the +3 ULA intentionally delays ... different way how the +3 ULA prepares the screen address on ... an oversight/shortcut in the ULA design, so I was ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... . I will just get the timing right, as you say it ... duration properly, like the original ULA did, they simply let it ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... timing, the first value shall appear at T cycle 17988 after ULA ... previous attribute, depending on the timing characteristics of the chips used ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    ... versions of the Spectrum 48K ULA:

    [LIST]
    ULA (Issue 2 boards).
    timing for increased compatibility with certain ... on the timing changes incorporated into the 6C001E-7 ULA.
    ...
    bverstee bverstee March 2014 Hardware
  • New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …

    ... the propagation delays and other timing details of all that. All ... source of the early/late timing differences. It's ok if ... 48K machine with 6C001E-7 ULA all consistently returned 69888/YES ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    ... issue 6A with a 5C112E ULA in it, seemed to work ... of the DRAM timing issues of using a ULA < 6C001E-7
    guesser guesser March 2014 Hardware
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    If it's a RAS/CAS timing mismatch, then the effect should be something like ULA snow.

    I've a socketed 4A and a spare 5C112E, I'll try the same thing to see what happens :razz:

    B
    balford balford March 2014 Hardware
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    ... revision numbers because of the timing difference between 6C001E-6 and ... six versions of the Spectrum ULA.

    5C102E
    5C112E ...
    rga24 rga24 March 2014 Hardware
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    ... revision numbers because of the timing difference between 6C001E-6 and ... six versions of the Spectrum ULA.

    5C102E
    5C112E ... left like the 6C001E-6 ULA? The 5C112E screen matrix looks ... of the imperfections of the ULA (non-centred screen, etc.) ...
    zub zub March 2014 Hardware
  • Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…

    ... space rather than the 16K ULA/RAM address space? If not ... , I'd like to support ULA+ but it can't be ... on a chip (foregoing perfect timing accuracy for the moment) and ... suggested before, sticking a spare ULA and RAM on a board ...
    joefish joefish April 2014 Hardware
  • Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…

    ... then the only requisite for timing would be that the vertical ... chip that just emulates the ULA and external RAM is one ... , become contended - would the external ULA/RAM setup be able to ...
    joefish joefish April 2014 Hardware
  • 5C series NTSC ULA 5C114E 8248Not sure if this has been mentioned before; I haven't seen anything about it online. Chris Smith's book discusses 6C011E as the NTSC ULA sold in Spec…

    ... .112 MHz ( TS2068 ). Assuming this ULA uses 224 t-states per ... lines per frame video timing, it will have timing that is quite ...
    rga24 rga24 April 2014 Hardware
  • +2 Grey Composite question.Hello all, Long time reader first time poster and all that...... Probably a daft question which has been asked hundreds of times, even though I ca…

    ... />
    The 48K Spectrum ULA has 448 dots per line ... />
    The 128K Spectrum ULA has 456 dots per line ... spec than for the 48K ULA.

    Because ... System has the exact same timing as the 128K Spectrum ... the 16/48k the ULA generates analogue YUV to ...
    rga24 rga24 April 2014 Hardware
<1…11121314151617…34>

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