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<1…10111213141516…34>
  • Emulating the SamRAM on the ZX Spectrum SEGerton Lunter gave me permission to reuse the code, but so far I have not been able to get the software to work in paged RAM banks.

    ... accumulator was changed in the interrupt. Then some paging tests were ...
    icabod icabod October 2005 Emulators
  • Ninja ?bug?Doing rzx of ?Ninja? but can?t finish it because to open the last secret room you need [B]six[/B] idols to be collected. They are scattered in the …

    ... to be overwritten whenever an interrupt occurs. This could actually be ...
    Mr. Anonymous Mr. Anonymous November 2005 Games
  • WarningWarning Some games such as "Cyclone" WILL NOT run on a +2A. I have tried numerous times, and every time the load fucks up resulting in a 48K BASIC …

    ... is because the game uses Interrupt Mode 2 to utilise custom ... $FFFF is used for the Interrupt routine where a negative relative ...
    Geoff Geoff November 2005 Games
  • Speccy + issues?There was a topic somewhere regarding the different issues of the Spectrum keyboard and how it had some subtle effects on programs. Just wondering …

    ... 't think it is an Interrupt Mode 2 problem as it ...
    Geoff Geoff November 2005 Hardware
  • Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …

    ... 's /RESET line) "resets the interrupt enable flip-flop, clears the ... and R and sets the interrupt status to mode 0." Of ...
    Philip Kendall Philip Kendall November 2005 Sinclair Basic
  • New ZX Adventure Club Game - First Half of NovemberAnd starting today it's: Just in time for Hallowe'en :) [url="http://www.worldofspectrum.org/infoseek.cgi?regexp=^Scapeghost$&pub=^Level+9+Computin…

    I've been busy, so I played it just once. A kind ghost was introducing me to the neighborhood when I had to interrupt.

    I'll have another go today or tomorrow.
    WhenIWasCruel WhenIWasCruel November 2005 Games
  • Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..

    ... 14336 T-states from the interrupt pulse the first byte is ...
    Mp Mp November 2005 Hardware
  • Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..

    ... 14336 T-states from the interrupt pulse the first byte is ...
    icabod icabod November 2005 Hardware
  • Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…

    Sorry to interrupt this conversation, but Mike, can you please check your chuntey.com email.

    Cheers,

    Daren
    Daren Daren November 2005 Emulators
  • JIL - chuckie eggso far ive got to level 91 and have all the snapshots.......doesnt look like theres an end to this game it just seems to repeat after about level 30 …

    ... , no snaps saving, no any interrupt - just like reall Speccy) !!
    Alex_Lux Alex_Lux November 2005 Sinclair Miscellaneous
  • JIL - chuckie eggso far ive got to level 91 and have all the snapshots.......doesnt look like theres an end to this game it just seems to repeat after about level 30 …

    ... , no snaps saving, no any interrupt - just like reall Speccy) !!
    Daren Daren November 2005 Sinclair Miscellaneous
  • JIL - chuckie eggso far ive got to level 91 and have all the snapshots.......doesnt look like theres an end to this game it just seems to repeat after about level 30 …

    ... , no snaps saving, no any interrupt - just like reall Speccy) !!
    Frankie Frankie November 2005 Sinclair Miscellaneous
  • length of 48k .sna fileJust a quickie :) Is the length of a 48k .sna 49152 or 49153, i.e. does it go from 0 to 49152, or from 1 to 49152? (If that makes any sense?) Cheer…

    ... ,IX
    19 - 01 byte Interrupt (bit 2 contains IFF2, 1 ...
    rich_chandler rich_chandler November 2005 Development
  • what does the instruction im do?me again with more questions sorry :D finally got myself a book on machine code from ebay. whilst reading it it listed the command im with the warn…

    ... '.

    It changes the Interrupt mode of the Z80 between ...
    Geoff Geoff December 2005 Development
  • what does the instruction im do?me again with more questions sorry :D finally got myself a book on machine code from ebay. whilst reading it it listed the command im with the warn…

    ... '.

    It changes the Interrupt mode of the Z80 between ...
    mestor mestor December 2005 Development
  • info for write a emulatorHello Recently, i speak with a german programmer and he says me that in WOS there are a section emulators programmers, where find information about …

    ... /> Execute the end-of-frame interrupt code.
    Update the display ...
    Dunny Dunny January 2006 Emulators
  • Funniest Spectrum-related memorySeeing the emulated loading screen on the Dreamcast speccy emulator reminded me of something from many moons ago. I was in the local computer shop w…

    ... should be run in an interrupt. Ho-hum.
    icabod icabod January 2006 Sinclair Miscellaneous
  • Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …

    ... 'll need to be in Interrupt Mode 2).

    Again ...
    icabod icabod February 2006 Development
  • Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …

    ... to setup the vertical blank interrupt, and read the keys (plus ...
    addictive1 addictive1 February 2006 Development
  • Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …

    ... when the ULA's vbi interrupt occurs, the z80 reads a ... can also find a generic interrupt service routine that is able ... hooks on a specific interrupt vector. When an interrupt occurs, each of ... hw responding to the same interrupt. Each hook is the ISR ...
    Alcoholics Anonymous Alcoholics Anonymous February 2006 Development
  • 128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…

    ... going to change. If normal interrupt code is to run, then ...
    Fikee Fikee February 2006 Development
  • 128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…

    ... on 49152
    wait for interrupt
    set bank 7 to ... both banks
    -wait for interrupt when switching normal/shadow screen ...
    Fikee Fikee February 2006 Development
  • Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…

    ... Cisco Heat by moving the interrupt table (years ago, before I ...
    Jmk Jmk February 2006 Games
  • Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…

    ... , LDIR it into the old interrupt table, poke a couple of ... data bus and cause the interrupt to read from 0x03?? instead ...
    Jmk Jmk March 2006 Games
  • 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 ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Sinclair Basic
  • 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 …

    ... be very simple. Then the interrupt service routine for up to ... something for really fast realtime interrupt response... who knows.

    interrupt. The hw would make the ... o/s call; an NMI interrupt generated by a timer would ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Sinclair Basic
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... BC (or whatever) then... Another interrupt crashes in!

    Marcelo ...
    Marcelo Marcelo March 2006 Development
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... the end of Basic's interrupt routine reenables interrupts and there ... 't happen because of pending interrupt. Probably not the cause here ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Development
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... make the assumption that the interrupt will jump to the address ...
    icabod icabod March 2006 Development
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... of info...
    When the interrupt occurs, the I register is ...
    icabod icabod March 2006 Development
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