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<1234567…34>
  • Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…

    ... what you're trying to do there. You haven't ... />
    What you can do is just have a single ... does a RET. Then you do EI and HALT in your main ... program loop. (Note that EI immediately followed by HALT is ... , as the action of EI is actually delayed until the ...
    joefish joefish November 2016 Development
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ... waiting for down signal
    ld a,#0xfe ; signal tx to low ... RESULT_SUCCESS ; report success

    ei
    ret
    [/CODE]
    * common types used in code (do not include stdint.h!)
    [B]app.c[/B][CODE]int main(int argn,char **argv)
    tstih tstih July 2014 Development
  • NEW INTERFACE FOR ZX SPECTRUM!!Hi all zx-maniax! Here is a letter from Polish inventor, Yarek Adamski. He constructed a new brilliant interface for ZX SPECTRUM. Ready carrefuly i…

    ... perfect and you had to do
    some experiments with angle ... to connect the signal bus,
    - what to do to keep possibility ... , I've plugged this YAMOD int YABUS.ZX.
    It is ... screen line as Sam
    do.
    - YAMOD.KMOUSE - means Kempston ...
    Yerz Yerz July 2003 Sinclair Miscellaneous
  • Crappy composite/TV signal on grey +2 machineI got a grey +2 machine from eBay a couple of days ago. It's working fine, but both the TV signal and the composite signal taken from the monitor con…

    ... both the TV signal and the composite signal taken from the monitor ... case and what I might do to improve the situation? I ...
    J?rg Pleumann J?rg Pleumann July 2004 Sinclair Miscellaneous
  • Challenging the orthodoxy - Composite modWell, what's brought this on is two things: firstly I composite-modded an Issue 4S board this weekend in preparation for the Vintage Computing Festiv…

    ... impedance. But it doesn't do that, I think someone has ... why it doesn't actually do anything useful:

    ... low output impedance where the signal goes into the TV modulator ... tKP_YpyZTC8rrotxlSsZvoIIF4g&hl=es&ei=GwoFTL6JG9LI4gbomtzLDg&sa=X& ...
    Winston Winston June 2010 Hardware
  • Help me understand ZX RGB signal (long)This will be a long post so please bear with me and most importantly help me. I have a 128K+ and +2A that I'm trying to get working with my 15kHz RG…

    ... to supposedly provide RGB SCART signal - these cables are from ... com/rgbcgatovgac.html[/url]
    Signal Requirements:
    RGB: 0.7Vpp ... when SCART devices display composite signal, but not when using ... it that some devices can do with less voltage? What is ...
    pkupcik pkupcik September 2010 Hardware
  • 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…

    ... of the well-documented Z80 do.

    First ... is echoed to the INT line. I'm unclear ... READ sets the vertical sync signal as active. IOREQ+WRITE ... So in that case does INT still trigger, with ignoring ... meaning that it usurps INT from the Z80's internal ...
    Thommy Thommy September 2011 Hardware
  • The Sinclair ZX Microdrive Resurrection Project (long)Dear Spectrum fans! [Management summary: Download [url]http://www.bartheld.net/temp/mdv2img.zip[/url] and tell me what you think. All help very much…

    ... easy soldering job to do, I connected the cinch ... adhesive foam tape would do the trick. And indeed ... on the spindle, lowering signal-to-noise-ratio.
    ... // enum tPolicies
    const unsigned int cPOLICIES=eFIX_DATA|eACCEPT_ERRORS|eOVERWRITE_OUTPUT; // only ...
    Volker Volker March 2012 Emulators
  • +2A - stuck on test signalHi, new member here, hope it's OK to ask for help... I recently rescued my old +2A from my parents' loft. When I tried to test it out, I've found th…

    ... menu, it shows the test signal (colour bars with "1987" in ... - it seems that the test signal should only appear if the ... only get to the test signal colour bars and beeps.
    Is there anything I can do, or is my old +2A ...
    Scarysheep3000 Scarysheep3000 November 2012 Hardware
  • z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…

    ... />

    when trying to do it all in assembly it ...

    org 51400
    int
    push af ; preserve registers ... ; select interrupt mode 2.
    ei ; enable interrupts.
    #endasm
    slenkar slenkar October 2013 Development
  • What to do when INT doesn't work?Due to the limitations of the Spectrum's floating point number format, two slightly different large numbers, or two slightly different small fraction…

    ... PRINT t 19010
    PRINT INT (t/69) 275
    PRINT ... PRINT t 19010
    PRINT INT (t/69) 275
    PRINT ... 35.000031 (!)
    PRINT t-INT (INT (t/69)*69) 35.000031 ...
    Battle Bunny Battle Bunny January 2014 Sinclair Basic
  • Double Buffer UtilityHi Folks, I've been experimenting with double buffering on a 48k Speccy for a small project I'm working on. After reading lots of good advice here…

    ... doPrint()
    # - Does not do anything with attributes

    self.spStorageAddr = int('0x5CB0',16) #Where to store ... - Enable Interupts')
    self.doPrint('EI')


    #10 - ...
    KrazyKattapilla KrazyKattapilla August 2014 Development
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... .

    All 3 machines do this.

    My suspicion ... the ChinnyVision videos dislikes the signal and keeps cutting out (I ... with resisters but before I do, has anyone come across this ...
    chinnyhill10 chinnyhill10 January 2015 Hardware
  • No RF signal from modulatorGot a bit of a strange fault. I've got an Issue 2 spectrum which the TV doesn't lock onto. The TV locks to other Speccy outputs.<div><br></div><div>I…

    ... ) and I have a decent signal to the modulator (I get ... have any ideas what to do? 
    I only have a ...
    Will Woodvine Will Woodvine June 2015 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    ... to split the A/V signal and feed it to two ... it's not OK to do this with the RGB signals ...
    joefish joefish October 2016 Hardware
  • Scart to HDMI coverters/upscalers - Do they Work OK With +2/+3 Speccy.Just wondering if anyone has experience of these Scart to HDMI coverter/upscalers. Do they work OK? Been looking at this one on farnell's site:- […

    ... Scart to HDMI coverter/upscalers. Do they work OK? Been looking ... ="https://cpc.farnell.com/pro-signal/psg3364/scart-to-hdmi-converter ... "]https://cpc.farnell.com/pro-signal/psg3364/scart-to-hdmi-converter ...
    Your Spec-chum Your Spec-chum June 2022 Hardware
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... cycle (called that because the signal /M1 goes low when an ... interrupt acknowledge cycle when the signal /M1 happens to go low ... have a look at the int acknowledge timing diagram, you can ... the Mostek doc). But I do trust the Mostek manual as ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • Basic info about platformers...I have run a search for an answer to this question and haven't found quite what I was looking for so I thought I would pop a post on here... What ar…

    ... the simplest way to do collision detection is ...
    struct Sprite {
    int x, y; //current position of ... overlaps another. If they do, you have a collision ... is that it may signal a collision even if ... the sprite pixels themselves do not overlap, because the ...
    Arjun Arjun October 2004 Development
  • Z88DK + SPLIB2 question.I downloaded the compiler, installed it following the instructions (found at the SPLIB2 website), updated it using the fixed files (stdlib.h and the …

    ... sp_CreateGenericISR(0xf1f1);
    #asm
    ei
    #endasm

    ... /* since we couldn't do it in the static initializer ... struct sp_Rect *result);
    extern int __LIB__ sp_IntLargeRect(struct sp_LargeRect *r1 ...
    na_th_an na_th_an April 2005 Development
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... an NMI interrupt or the /INT pin to generate a maskable ... signals on its /NMI and /INT pins depends on the type ... will ignore maskable interrupts. The "ei" instruction re-enables them so ... .LIB's im2_Init() function to do all the im2 set-up ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • 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.…

    ... R57 (330R I think) will do nothing....

    This ... tracks RFSH, then the signal is getting through and the ... , trigger your scope on ~INT and look at what RFSH ... first display row). Then do the same for 4116 RAS ... me how long after ~INT the ULA RAS go low ...
    csmith csmith 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…

    ... be converted to do away with the INT tweak? If ... ]

    Syncing with INT is 'only' a tricky-level ... the data bus with an ei/reti combination when (if ... assert WAIT until the INT does occur. Being late ... machine does generate the INT, supply the correct IN ...
    Alcoholics Anonymous Alcoholics Anonymous June 2008 Hardware
  • RZX reference samplesJust wondering, is it ok that neither Spin nor Spectaculator can replay the RZX reference samples provided on the [URL="http://www.ramsoft.bbk.org/rz…

    ... in the first place (normally EI HALT).[/QUOTE]
    Yes, I ... (doesn't make much sense do it differently). Phil and I ... if ints are enabled, the int should be taken". If this ...
    Patrik Rak Patrik Rak July 2008 Emulators
  • Speech reproduction on the Speccy - 2009 style?Thanks to Chapter 33 of [url="http://www.worldofspectrum.org/infoseekid.cgi?id=2000388"]Super Charge Your Spectrum[/url] by David Webb - "Speech Repr…

    ... too much other stuff to do than refine this routine.

    int main(int argc, char **argv)
    {
    FILE *stream;
    int i,j;

    if ...
    Winston Winston January 2009 Development
  • 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 an opcode following an EI opcode then the Z80 will ... what does this have to do with Top Gun freezing on ...
    Arjun Arjun February 2009 Games
  • +3 Centronics port: How does it work?I've been trying to follow the code with Fuse's debugger and I can't see it writing anywhere except to port 0x1ffd. It also jumps through some fairly…

    ... read it.
    I do seem to remember you can ... /> ; Read: bit 0 = busy signal from the printer.
    ; Write ... (SYSVAR_BANK678),a
    2216 fb ei

    ;
    ... done.
    2238 fb ei
    2239 37 scf ; ...
    spodula spodula July 2009 Hardware
  • Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …

    ... signal that makes a HALT instruction end,
    invoke a MASK-INT ... LD B,0 ;redundant
    EI ;prepare for returning
    RET ... DI ;4 nullify the EI inside MASK-INT
    DEC HL ;6 ... ) ;fetch 'FRAMES' for printing
    EI
    RET

    ...
    roko roko November 2009 Development
<1234567…34>

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