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<1234567…34>
  • TimingHey All, Is their away of obtaining timing information on ZX128k other than addresses 23672->23674. Basically I would like to identify every 100th …

    ... /> Is their away of obtaining timing information on ZX128k other than ...
    GBNvK GBNvK January 2004 Development
  • A few questions regarding EmuZwinA few questions regarding EmuzWin 1. I have been trying to write a program to generate multicolour effects on the Spectrum,ie more than 2 attributes…

    ... , when timing it on EmuZwin I noticed that sometimes an LDI is ... lot about how that affects timing.

    2. When assembling ...
    dmsmith dmsmith 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 …

    ... , when timing it on EmuZwin I noticed that sometimes an LDI is ... lot about how that affects timing.

    2. When assembling ...
    dmsmith dmsmith August 2004 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... , as well as correct any timing information stated above. I would ...
    Patrik Rak Patrik Rak September 2007 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 added support for Pentagon timing instead, so I can finally ... the floating bus behavior and timing. An explanation how the ULA ...
    Patrik Rak Patrik Rak November 2007 Emulators
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... (253*256 + 253)
    ldi ;Copy the 3-byte jump ... instruction
    ldi
    ldi

    ;Install ... 224t line

    nop ;Timing adjustment tweaks
    nop
    push af
    nop ;Timing adjustment tweaks
    nop
    joefish joefish May 2009 Development
  • 48k Timing Tests...Here's v1 of the timing tests for the 48k Spectrum, with a little background [IMG]http://www.zxspectrum4.net/images/timing_test_v1.jpg[/IMG] [URL="…

    Here's v1 of the timing tests for the 48k Spectrum, ...
    Richard_Butler Richard_Butler April 2010 Development
  • Contention: LDI vs LD (ss), rAccording c.s.s. FAQ: instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b] and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b] can anyone explain why …

    ... ]ss:3[/b]
    and LDI as pc:4,pc+1 ... explain why WRITE operation in LDI introduces two delays? or that ...
    Fikee Fikee February 2011 Development
  • Most accurate timingWhich emulator is closest in timing to an actual (48k) spectrum? A count to 10,000 loop, printing the loop number each time on screen - same snapsho…

    Which emulator is closest in timing to an actual (48k) spectrum?< ... />
    Hmm.
    Getting accurate timing for sound is going to ...
    Gedlion Gedlion June 2012 Emulators
  • Timing in loading routinesJust for curiosity I have done some experiments with SAVE command in accurate emulators, and then analyzing the generated WAV and I have obtained lit…

    ... one.

    All this timing is for 48K machines. The ...
    antoniovillena antoniovillena February 2013 Development
  • Timing of Timex Computer 2068Is the timing of the Timex Computer 2068 fully documented yet? I have one here with the ZX Spectrum Emulator cartridge and have downloaded a few test…

    Is the timing of the Timex Computer 2068 ... 6C001 ULAs. The contended memory timing seems to be the same ... ; however the I/O timing is quite different, not least ... test the contended I/O timing. Plenty of other ports should ...
    rga24 rga24 April 2013 Hardware
  • 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…

    ... awkward it even throws up timing differences between the 128K and ...
    joefish joefish October 2013 Development
  • LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …

    When using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store it?
    MatGubbins MatGubbins March 2014 Development
  • 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, …

    ... sure I got the ULA timing 100% right. We know when ... uses early or late CPU timing, please run the btime test ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…

    ... -time.
    ;
    ;+2A timing and 128K timing tested.
    ;Full 16x16 ... X to address

    ldi
    ld a,(hl)
    inc l
    ldi
    ldi ;draw two pixel rows
    joefish joefish March 2014 Development
  • Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…

    ... Aug'87. Apart from a timing comparison I also did a ... />
    Here's the BASIC timing routine which I use. The ... in line 9994. The first timing should be done with 9994 ... get the loop overhead. The timing for that is then deducted ...
    Battle Bunny Battle Bunny January 2017 Sinclair Basic
  • [Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…

    ... a partially unrolled set of LDI's (let's say 5 ...
    ST1 ST1 November 2018 Development
  • 5C Horizontal timing vs 6C horizontal timing.Hi all, Just considering the timing difference in the video signal between the 5C and the 6C where the 6C ULA seems to have 50% longer horizontal …

    ... ,

    Just considering the timing difference in the video signal ...
    cj7hawk cj7hawk October 2021 Hardware
  • 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 …

    ... :03, dmsmith wrote:

    [LDI taking 24 Ts]

    timing.
    [/quote]

    It ...
    Woody Woody August 2004 Emulators
  • help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…

    ... speed at runtime but the ldi method allows selecting scrolls by ... cycles to play with. The ldi method already has you at ... the tear, keeping the stretched timing in mind could make a ...
    Alcoholics Anonymous Alcoholics Anonymous February 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... delay. Using unrolled loops of LDI instructions gets around both of ... or at least very delicate timing, as an interrupt will push ... it no faster than the LDI method. That said, a lot ...
    Matt_B Matt_B October 2008 Development
  • LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…

    ... , is:
    [code]Contended: LDIR LDI

    Only (DE) 24 ... up the 16 T/byte timing. I thought it best to ... bytes more quickly than [b]ldi[/b] writes one. They're ...
    ajmoss ajmoss June 2010 Development
  • BUZZSAW+ Demo No. 3Right, another demo of BUZZSAW+. [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_3.tap"]Joefish_Buzzsaw_Demo_3.tap[/URL] The default con…

    ... timing works on a POP/PUSH copied rainbow generator instead of LDI ...
    joefish joefish August 2011 Development
  • 64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…

    ... a long instruction (like an LDI), it'll finish that before ... switch screens, and adjust your timing to align the stripes in ...
    joefish joefish July 2012 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... now you should only run timing critical code in uncontended RAM ... for running contended, the [B]LDI[/B] version cannot.[/quote]
    LDI is still preferable to PUSH ... further, for instance using [B]LDI[/B] during upper border scan ...
    chev chev October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... you should only run timing critical code in uncontended ... ]There are instances where LDI is still preferable to ... /> set 5, d
    ldi
    res 5, h
    set 5, d
    ldi
    res 5, d[/code ...
    Einar Saukas Einar Saukas October 2013 Development
  • Beautiful codeSome people see beauty or something sublime in maths formulas and equations, can anyone suggest examples of beautiful or sublime programming?

    ... they are effective but seeing LDI LDI LDI LDI repeated 32 times or so ... advantages when you need perfect timing of your code as it ...
    Ralf Ralf May 2014 Development
<1234567…34>

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Related Threads

  • 5C Horizontal timing vs 6C horizontal timing.Hi all,<br /> <br /> Just considering the timing difference in the video signal between the 5C and the 6C where the 6C ULA seems to have 50% longer…
  • TimingHey All,<br /> <br /> Is their away of obtaining timing information on ZX128k other than addresses 23672-&gt;23674. Basically I would like to identi…
  • Contention and floating bus timingHello,<br /> <br /> I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit.…
  • 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…
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  • 48k Timing Tests...Here's v1 of the timing tests for the 48k Spectrum, with a little background<br /> <br /> [IMG]http://www.zxspectrum4.net/images/timing_test_v1.jpg[/…
  • Contention: LDI vs LD (ss), rAccording c.s.s. FAQ:<br /> <br /> instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b]<br /> and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b]<br /> …
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