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<1234567…34>
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... similar. The time the /INT line is held low can be ... will sample the /INT pin. If /INT is low and the ... before the ULA has pulled /INT high again. For example, ... finish 23 tstates after /INT went low. As noted ... finish 27 tstates after /INT went low, and another ...
    Philip Kendall Philip Kendall July 2004 Development
  • ZX80 and 81 hardware questionsI'm finding a lot of the documentation that is ostensibly about the hardware of the ZX80 and 81 to be primarily about the software. I was hoping some…

    ... address is echoed to the INT line. I'm unclear whether bit ... line when IOREQ + WRITE are active. So in that case does INT ... address, meaning that it usurps INT from the Z80's internal ...
    Thommy Thommy September 2011 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…

    ... moment the ULA triggers the INT line, which most emulators count as ...
    mcleod_ideafix mcleod_ideafix November 2014 Development
  • RAD for SpeccyJust wanted to share a fine technique of rapid app development for ZX Spectrum in C. Programming without debugger is a pain. It comes down to needing…

    ... ;
    int startLine;

    // Start line is line at which ... it.
    int line = 0;

    while (line < intersect. ... {

    // Calculate line pos. in vmem.
    int addr = 0, bit ...
    tstih tstih January 2018 Development
  • New discovery on Z80 interrupts.This is to announce the discovery of a new, hitherto unknown, behavior of the RETI and RETN instructions. As everyone knows, the maskable interrup…

    ... re-enabling interrupts if the /INT line is still active, which could ... instructions will not prevent an INT request from being accepted.
    rich_chandler rich_chandler April 2022 Emulators
  • Problem with RealSpectrumWhy am I having difficulty getting certain games to laod in RealSpectrum? The game seems to be loading ok then the screen goes black and nothing hap…

    ... an RC couple on the INT line, but I need to make ...
    Luca Luca May 2004 Emulators
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... similar. The time the /INT line is held low can be ... will sample the /INT pin. If /INT is low and the ... before the ULA has pulled /INT high again. For example, ... finish 23 tstates after /INT went low. As noted ... finish 27 tstates after /INT went low, and another ...
    Fraser Fraser July 2004 Development
  • Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…

    ... is about to refresh". The /INT line is pulled low by the ... 9. The comments after each line indicate the number of tstates ...
    Philip Kendall Philip Kendall September 2004 Development
  • 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…

    ... it wouldn't work). The INT line is certainly not open collector ...
    Winston Winston September 2007 Emulators
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    ... when the Z80 acknowledges the INT line, where IORQ goes low and ... you can test the M1 line by jumpering M1 (quite a ...
    Winston Winston October 2007 Hardware
  • Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…

    ... refused to trigger on the INT line (may need to be sent ... ;5ms gap in the /RAS line to the 4116 memory. If ... connected the other channel to /INT it showed that the interrupt ... . /RAS is the top trace, /INT the bottom.

    [url ...
    Winston Winston November 2007 Sinclair Miscellaneous
  • RZX Player interface - Possible?If I have a Mass Storage interface and some media (CF, SD) with a couple RZX files, what would I need to play them on a real Spectrum? If the RZX fil…

    ... instruction fetches and tweaks the /INT line at the time specified in ...
    Philip Kendall Philip Kendall June 2008 Hardware
  • RZX Player interface - Possible?If I have a Mass Storage interface and some media (CF, SD) with a couple RZX files, what would I need to play them on a real Spectrum? If the RZX fil…

    ... machine. For example, stroking the /int line to mark the start of ... occur within the frame (the /int sync mentioned above).

    Alcoholics Anonymous Alcoholics Anonymous June 2008 Hardware
  • RZX Player interface - Possible?If I have a Mass Storage interface and some media (CF, SD) with a couple RZX files, what would I need to play them on a real Spectrum? If the RZX fil…

    ... machine. For example, stroking the /int line to mark the start of ...
    Philip Kendall Philip Kendall June 2008 Hardware
  • RZX Player interface - Possible?If I have a Mass Storage interface and some media (CF, SD) with a couple RZX files, what would I need to play them on a real Spectrum? If the RZX fil…

    ... instruction fetches and tweaks the /INT line at the time specified in ... :-)[/QUOTE]

    Tweaking the INT line is the only bit that ... least removing the ULA's INT output, and putting it under ... count (assuming a working M1 line) and fetching some data from ...
    Winston Winston June 2008 Hardware
  • RZX Player interface - Possible?If I have a Mass Storage interface and some media (CF, SD) with a couple RZX files, what would I need to play them on a real Spectrum? If the RZX fil…

    ... /> [/QUOTE]

    Syncing with INT is 'only' a tricky-level ... completed), pull the INT line low.

    If INT arrives late on ... machine assert WAIT until the INT does occur. Being late ... real machine does generate the INT, supply the correct IN ...
    Alcoholics Anonymous Alcoholics Anonymous June 2008 Hardware
  • User reviewsAs often requested (e.g. [URL="http://www.worldofspectrum.org/forums/showthread.php?t=18135"]here[/URL]), user reviews are now possible through the s…

    ... ULA is still asserting the /INT line during the final tstate of ...
    Bob Stains Bob Stains February 2009 Games
  • User reviewsAs often requested (e.g. [URL="http://www.worldofspectrum.org/forums/showthread.php?t=18135"]here[/URL]), user reviews are now possible through the s…

    ... ULA is still asserting the /INT line during the final tstate of ...
    psj3809 psj3809 February 2009 Games
  • User reviewsAs often requested (e.g. [URL="http://www.worldofspectrum.org/forums/showthread.php?t=18135"]here[/URL]), user reviews are now possible through the s…

    ... ULA is still asserting the /INT line during the final tstate of ...
    Arjun Arjun February 2009 Games
  • SIF interfaceNew hardware was developed for spectrum. It is dual full UART with HW flowcontrol. In addition module could be populated with ConnectOne module for W…

    ... synchronized with a particular scan line being drawn to the TV ... the spectrum and the interrupt line would have to be cut ... your interface asserting the real int line on their behalf) so that ...
    Alcoholics Anonymous Alcoholics Anonymous September 2009 Hardware
  • SIF interfaceNew hardware was developed for spectrum. It is dual full UART with HW flowcontrol. In addition module could be populated with ConnectOne module for W…

    ... checking if something else generate INT (ULA).
    - Than at end ... synchronized with a particular scan line being drawn to the TV ... the spectrum and the interrupt line would have to be cut ... your interface asserting the real int line on their behalf) so that ...
    willcz willcz September 2009 Hardware
  • Assembly Programming for IDIOTSOk are there any websites guides for what opcodes do in a z80 or books... but for really really thick people like me :-) Something along the lines …

    ... still holding down the interrupt line (until it is cleared by ... +2A/+3 models, as the INT line is directly tight to the ...
    mcleod_ideafix mcleod_ideafix October 2010 Sinclair Miscellaneous
  • Z80 Processor Interupt helpHi everyone, Currently designing a Z80 computer and i need a little help with these interupts. If i have an I/O device that sends a pulse to the int…

    ... assume you're asking about INT interrupts, not NMI interrupts.
    INT line. Some I/O devices just ... INTA cycle to deactivate the INT line. Others, as the TMS9918/9929 ... the MSX world, pulse the INT line and leave it low until ...
    mcleod_ideafix mcleod_ideafix January 2011 Hardware
  • Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…

    ... /> Compilers assume integers so the 'int' line is not needed after all ... exo_mbb/256
    ;exo_mapbaseb equ int (exo_mapbb)
    exo_mapbasebits equ exo_mapbb ... you have said, assemblers assume int results.

    [QUOTE=Crisis ...
    antoniovillena antoniovillena November 2012 Development
  • Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…

    ... HALT state, the HALT line is set. The PC ... HALT state, the HALT line is set. The PC ... of the /NMI and /INT line on the rising edge ... an interrupt exists on either line the following cycle[/FONT] ... (/NMI) or an interrupt acknowledge (/INT).[/FONT]

    From ...
    1024MAK 1024MAK March 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…

    ... through it and the INT line itself appear cut right ... scalpel and cut the INT line good and proper near ... the track above the INT line (the D15 line) I got 1. ... area
    [*]On the INT track on the left side ... 746
    [*]On the INT track on the right side ...
    Korinel Korinel 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…

    ... moment the ULA triggers the INT line, which most emulators count as ...
    Einar Saukas Einar Saukas November 2014 Development
  • Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …

    ... a solder splash shorting the INT line to an adjacent track caused ...
    balford balford January 2017 Hardware
  • Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …

    ... bad.

    I traced INT from the ULA across to ... the interrupt pules on the INT line and they read the same ...
    Jet5y Jet5y January 2017 Hardware
<1234567…34>

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