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<1234567…34>
  • Interrupt driven code at overclocked pace....Is it possible for a MC coder to do a routine (i.e. interrupt music player, for within/during Basic)if he knows said machine is running at 400 percen…

    ... do a routine (i.e. interrupt music player, for within/during ...
    CKay CKay August 2004 Sinclair Miscellaneous
  • Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?

    How long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
    Philip Kendall Philip Kendall February 2005 Development
  • Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…

    ... on the data bus at interrupt time, thus meaning that IM2 ...
    Philip Kendall Philip Kendall March 2009 Hardware
  • Input magazines 1 to 39 in 3 binders - ?12 delivered in UK[B][NOW SOLD][/B] :) First 39 issues, held in 3 binders: [img]https://dl.dropboxusercontent.com/u/15218813/Input1.jpg[/img] [img]https://dl.dropbox…

    ... SOLD][/B] :)

    First 39 issues, held in 3 binders ... hold issues 12 and 36 -39 are loose, and the strip ...
    spec-e spec-e December 2013 Sales
  • 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…

    ... ensure that an IM 2 interrupt handler starts always at the ... ,20,21 and 22, each interrupt, and then 19,20,21 ...
    mcleod_ideafix mcleod_ideafix November 2014 Development
  • ZX Uno programming competition[b]Rules[/b] - The game tematic is free. The languaje can be english or spanish. - You must use Radastan video mode in the game as principal. - …

    ... /> - Mix video modes (using raster interrupt). Example: Text adventure with graphics ... .com/forum/viewforum.php?f=39"]http://www.zxuno.com/forum ... /viewforum.php?f=39[/url]

    You can ...
    radastan radastan December 2015 Announcements
  • 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…

    ... been trying to create an interrupt routine for playing AY music ... /> Does the bank switching mean interrupt routines cant be used?
    daveysludge daveysludge November 2016 Development
  • Elon Musks's Blastar (Conversion)Back in 1984, the 12 year old Elon Musk wrote a rudimentary video game for his SpectraVideo SV-328 (another Z80 Microcomputer) [url="https://www.t…

    ... running as one part could 'interrupt' another.

    Secondly, the ...
    Snial Snial November 2020 Sinclair Basic
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... On 2004-07-27 13:39, Philip Kendall wrote:
    ... .

    * An interrupt cannot occur immediately after an ... br /> * M1: 7 tstates: acknowledge interrupt and decrement SP.
    * M2 ... /> * M1: 6 tstates: acknowledge interrupt and decrement SP.
    * M2 ...
    Fraser Fraser July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... On 2004-07-27 13:39, Philip Kendall wrote:
    ... br /> * M1: 6 tstates: acknowledge interrupt and decrement SP.
    * M2 ... /> * M1: 6 tstates: acknowledge interrupt.
    * M2: 3 tstates: read ... width, using the smallest interrupt routine possible ("EI;RETI") ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • Key press to ASCII valueI need a bit of code that will give me an ASCII value when the key is pressed. I only really need a-z. I tried using the following code but it only s…

    ... GetKey is part of an interrupt service routine
    ; then time ... , 4, 5
    defb '_',')','(',39,'&' ; 0, 9, 8, 7 ...
    Alcoholics Anonymous Alcoholics Anonymous July 2005 Development
  • Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …

    ... 't noticed is that an interrupt is about to occur (the ... I=47665/256=186. The interrupt vector table will be located ... the byte is 'X', the interrupt will jump to address X ... on 2006-03-03 21:39 ]
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Sinclair Basic
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... #FFFF at vector adress #38,#39 and #3A. Only vector #3B ... games (proxima software) use IM2 interrupt with vector adress #38-#3A ...
    velesoft velesoft April 2008 Development
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... #FFFF at vector adress #38,#39 and #3A. Only vector #3B ... games (proxima software) use IM2 interrupt with vector adress #38-#3A ...
    glancaster glancaster April 2008 Development
  • 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 …

    ... /Issue06/Pages/[/url] Pages; 39,40,41

    Interrupt'. This 'Interrupt' is known as a 'Maskable Interrupt' because ... using the 'DI' (disable interrupt) instruction, the 'HALT' ... br /> 5) We say 'Interrupt acknowledged' to describe the fact ...
    ASM ASM October 2010 Sinclair Miscellaneous
  • Empire! Help neededCan anyone convert the listing in the Tipshop to Multiface pokes? Im having a hard time with this game, over 15 years playing it, now I could do wit…

    ... , and on the +3 the interrupt vector is being calculated incorrectly ... I register is set to $39 on both, so it jumps ...
    Battle Bunny Battle Bunny September 2011 Games
  • 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…

    ... 32768
    M1
    ;set interrupt
    DI

    ... ,A ;the adress of interrupt code is stored at ( ... ,RETI command - end interrupt
    ;each interrupt automatically disables interrupts, so ... HL'
    MV5 LD DE,39*256+41 ;BC'
    MV4 ...
    Ralf Ralf July 2012 Development
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... inorrect value of register I = #39. ZX rom on +2A/+3 ... two bytes #FF,#FF = IM2 interrupt jump to incorrect adress...
    velesoft velesoft April 2013 Games
  • Getting aquainted with the IF1bisToday, fifteen days after dispatch, the IF1bis arrived at my door. In perfect order. No customs, no TVA and no handling fee involved. The arrival of …

    ... is decreased by 1 every Interrupt. When the counter reaches ... (HL)
    LD (nwentr),A ;39
    ;ready
    OUT ( ...
    roko roko December 2013 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…

    ... NZ,BACK
    END ;only 39 bytes! [/CODE]

    I ... (hl) ; 4t


    ; interrupt handler (+19t int +10t[+1 ...
    introspec introspec November 2014 Development
  • Head over Heels on 128KI noticed an interesting behavior of Head over Heels on 128K Spectrums, especcially with +2A/+3 machines. The game works, but after loading game, lo…

    ... a problem when using the interrupt vector $39, which is easily fixed ... "]TZX[/url] - it does the interrupt fix and the early screen ...
    jp jp September 2016 Games
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    Fix for Starfox (load in 48k mode):
    http://metalbrain.speccy.org/Starfox_fix.tzx

    Interrupt vector changed from $39 to $3B. This was easy to diagnose, but hard to patch due to Bleepload, but I did manage in the end.
    Metalbrain Metalbrain February 2017 Games
<1234567…34>

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