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<1…12131415161718…34>
  • QuickBASICQuickBASIC Emulation: Is it possible to declare and pass global variables throughout a program along with confine a local variable to just a module-…

    ... lines 9000 and above and MERGE your library in, but that ... would also merge any variables in too, into ...
    Dunny Dunny June 2004 Sinclair Basic
  • Coder`s with time....How many coders are there who can program anything? i.e. Commercial quality games, full blown applications, utilities etc.... who can do the lot? I…

    ... version - remove multiple documents, mail merge etc etc - and be fully ...
    CKay CKay June 2004 Development
  • Finishing my Ragnar game...Hi all, Way back then, in my youth, I worked on a game for the Speccy called "Ragnar", which was a 3d isometric style mcoded game written from scrat…

    ... to work with the frame interrupt (i.e the raster line ... /> [quote](and 4) perhaps also interrupt handling in general?)[/quote]
    cyborg cyborg July 2004 Development
  • Finishing my Ragnar game...Hi all, Way back then, in my youth, I worked on a game for the Speccy called "Ragnar", which was a 3d isometric style mcoded game written from scrat…

    ... game loop taking the frame interrupt in consideration. For a Coupe ... /> [quote](and 4) perhaps also interrupt handling in general?)[/quote]
    ekoman ekoman July 2004 Development
  • Finishing my Ragnar game...Hi all, Way back then, in my youth, I worked on a game for the Speccy called "Ragnar", which was a 3d isometric style mcoded game written from scrat…

    ... game loop taking the frame interrupt in consideration.[/quote]

    cyborg cyborg July 2004 Development
  • Z80 processor question...Suppose we fill the entire $0000-$ffff memory range with $ed. What will the processor do ? I suppose it will get locked, but will it still respond to…

    ... .
    [/quote]

    No interrupt will be accepted throughout any ...
    Woody Woody July 2004 Development
  • SMAX - My Spectrum Killer App that never quite materialisedThis is basically a copy of my post to CSS, for anyone that doesn't read the group:- One or two of you may, if you have particularly good memories, …

    ... your program also, and possibly merge the two. TommyGun in its ...
    Sadako Sadako 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…

    ... />
    * An interrupt cannot occur immediately after an ... * M1: 7 tstates: acknowledge interrupt and decrement SP.
    * ... * M1: 6 tstates: acknowledge interrupt and decrement SP.
    * ... /> * M1: 6 tstates: acknowledge interrupt.
    * M2: 3 tstates: ...
    Fraser Fraser July 2004 Development
  • Z80 core testing ?OK, my z80 core is almost finished (apart from RRD, RLD, and block instructions except LDI,LDIR,LDD,LDDR). I run the 48K rom and hurray, it resets co…

    The IX/IY regs seem to be fine - the system wouldn't boot at all without them, and it's not the interrupt routine that crashes, I've checked that.
    GOC GOC 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…

    ... /> * M1: 6 tstates: acknowledge interrupt and decrement SP.
    * M2 ... /> * M1: 6 tstates: acknowledge interrupt.
    * M2: 3 tstates: ... the instruction before the interrupt finished just as ... width, using the smallest interrupt routine possible ("EI;RETI ...
    Alcoholics Anonymous Alcoholics Anonymous 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…

    ... through PIO, that uses different interrupt service routines. The PIO by ... bus can tell that the interrupt routine has ended upon executing ... for ending the ULA generated interrupt by RETI.

    [url ...
    Mikie Mikie 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…

    ... opcode fetch performed in an interrupt acknowledge -- the instruction is obtained ... 7 cycles.

    These interrupt responses are documented in [url ...
    Alcoholics Anonymous Alcoholics Anonymous 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…

    ... through PIO, that uses different interrupt service routines. The PIO by ... bus can tell that the interrupt routine has ended upon executing ... for ending the ULA generated interrupt by RETI.
    [/quote]
    Alcoholics Anonymous Alcoholics Anonymous 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…

    ... ' document by Zilog available. The interrupt request/acknowledge cycle description says ...
    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…

    ... by Zilog available. The interrupt request/acknowledge cycle description says ... to M1 of an interrupt acknowledge cycle. It states ... actually part of the interrupt acknowledge cycle when the ... attached peripherals that an interrupt acknowledge cycle is underway ...
    Alcoholics Anonymous Alcoholics Anonymous 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…

    [quote]
    Non-maskable interrupt (NMI)

    When an ...
    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…

    ... /> IFF2 will maintain the maskable interrupt enable bit even if NMI ... />
    Clearing IFF1 disables maskable interrupt at NMI time. If another ... one exits the true maskable interrupt state is maintained by RETI ...
    Woody Woody July 2004 Development
  • Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…

    ...
    Wait for the IM2 interrupt (using the HALT command)
    ekoman ekoman 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…

    ... obviously break the correct maskable interrupt status bit when nested, and ...
    Woody Woody July 2004 Development
  • 2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…

    ... on the bus during an interrupt acknowledge, so it may have ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Development
  • Problems playback a Spin generated RZX file in Spectaculator Version 6.20.0540When playing back an RZX file generated by the rollback version of Spin, I get the following error about 2/3 of the way through: Spectaculator canno…

    ... has them) there may be interrupt scheduling issues, there may be ... fine in SPIN suggests an interrupt issue to me, though.
    Dunny Dunny August 2004 Emulators
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... each different kind of an interrupt and whether there were interrupts ...
    Erlstoned Erlstoned August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... whether you override the IM2 interrupt. An interesting question arises is ...
    Erlstoned Erlstoned August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... registers SP, I, PC and interrupt flags in your snap file ...
    Fikee Fikee August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    Is the 50Hz interrupt a MI or NMI ?
    cispasoiu cispasoiu August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... TV], the ULA(?) generates a interrupt and is doing this 50 ... ?
    (Dont answer before the interrupt occurs)
    I am trying ...
    cispasoiu cispasoiu August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    IIRC, you have approximately 70000T (some are used by the Z80 to respond to the interrupt) at your disposal, but 16000T seems way too much for a small sprite... are you sure it wasn't a typo ?
    GOC GOC August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... code I placed on an interrupt vector would run on some ... /> 2) Emulators handle the IM2 interrupt "correctly" except they don't ... any code placed on IM interrupt.

    Oh yes, thank ...
    Erlstoned Erlstoned August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... , which doesn't run my interrupt routine, and found that their ... interrupt routines all get executed. But ...
    Erlstoned Erlstoned August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... TV], the ULA(?) generates a interrupt and is doing this 50 ... ?
    (Dont answer before the interrupt occurs)
    I am trying ... video) generates a signal. if interrupt (IM 0, IM1, IM2) is ... enabled, processor jumps to interrupt routine (TIME: 0)
    in ...
    Fikee Fikee August 2004 Development
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