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  • 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 …

    ... /> .byte ;I register, points to rom spare locations filled with $ff ... repeat


    ; interrupt routine
    ; it does the same ... ]

    edited to add: at the end it should read ...
    Erlstoned Erlstoned August 2004 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... Start

    ; **** START INTERRUPT ROUTINE ***

    MainLoop:
    ; Store ... ;interrupts. Jump to 0056 in ROM
    jp 56 ;for ... to A
    ; So at this point, the contents of ...
    robpearmain robpearmain August 2004 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... interrupts. Jump to 0056 in ROM
    jp 56 ;for ... reti

    ; **** END INTERRUPT ROUTINE ***

    MoveAndPrintSprite:
    LD ... to A
    ; So at this point, the contents of ...
    robpearmain robpearmain August 2004 Development
  • RGB values for Spectrum colorsDoes anybody know the true rgb color values for the spectrums 15 colors. I'll assume that black is 0,0,0 White is probably 255,255,255 But what are t…

    ... /SAMCo format for their `patched` rom routines to make a SAM ... 48K, without the actual 48K rom being needed...

    I ... registers.

    The NMI routine is put in with SamDos ... SamDos, load in the Spectrum ROM in at 65536, then load your ...
    Quazar Quazar September 2004 Development
  • games written using game writng programsI was reading through some issues of crash not long back and one article was about some 16 year old that wrote Frank n stein for the speccy(never pla…

    ... (ISTR that it was aimed at people who were experienced MC ... complimentary demo copy) the rotate routine didn't work.? Hardly a ... because they used Nine Tiles' ROM? :)

    The other compiled ...
    robert@fm robert@fm September 2004 Games
  • Zecut0r and ZAFA while ago (about 2 yrs)i took VbSpec and tried to port it to Delphi 6. Althought it was pretty weak, it. Meanwhile DelphiSpec 0.1 appeared and i wa…

    The compiled demo is at [url="http://z80.aopsnaj.ro/ ...
    call 3435 ;"call ZX ROM ROUTINE"
    asmend ;"end assembler"
    call 949 ;"call ZX Beeper ROM ROUTINE"
    asmend ;"end assembler"
    zecut0r zecut0r October 2004 Emulators
  • Interesting Custom LoadersHi everyone, I was just thinking about custom loaders on the spectrum and I thought I'd ask you all what you thought was the best one. I'd have to …

    ... the new tape. So looking at examples of other turbo-loading ... the same as for standard ROM blocks.

    (I can ... I write my custom loading routine, hence the reason for the ...
    monty.mole monty.mole October 2004 Sinclair Miscellaneous
  • SpeedloadersSince I read Lee Tonks' post about the speedloaded version of MM3 he did, I've been playing around with various speedload routines I found on TTFn & …

    ... I never encountered a full routine loader located in range #4000 ... the starting (waiting) routine, then jump in ROM for the main bits ... the ones from Alternative Software - at least some games from compilation ...
    secarica secarica October 2004 Sinclair Miscellaneous
  • Compressed Loading ScreensHi everybody From my speccy memories I could swear I could remember games with loading screens that took less than normal time to load. But up until…

    ... wrote:
    3 16k games at once? Interesting. How did they ... them?

    I looked at some other copressed screens and ... by IM2 through the normal ROM-routine, but there is a test ...
    Dr BEEP Dr BEEP November 2004 Sinclair Miscellaneous
  • Setting the borderCan someone tell me best way to set the border to a given colour using machine code. Its there an operating system call or can I load up a memory loc…

    ... to the beeper sound routine in the ROM.

    To set ... you require and call the ROM routine at 8859. This will change the ...
    jonathan jonathan February 2005 Development
  • plus3dos headersThe plus 3 manual states that bytes 15...22 contain +3 BASIC header data. Which on the whole seems to be true, however I've never seen bit 22 being a…

    ... "depends on your tape routine" respectively. The ROM code saves the flag ... want to be reading the ROM disassembly at this point!

    Philip Kendall Philip Kendall April 2005 Development
  • Competition: Sadistick routine on Spectrum ROMMy vote goes to BEEPER at #03B5 Let's ear you pick! :) And a great BOHHHHHHHHHHHHH to Dr Ian Logan & Dr Frank O'Hara for their description about the…

    ... BC,duration
    CALL 2D2B ; ROM routine to put value of BC ... A,note
    CALL 2D28 ; ROM routine to put value of A ... is to much, I need at least 250 ms
    AE.Vasconcelos AE.Vasconcelos May 2005 Development
  • You all know this, right?Type 10 PRINT "DIXONS IS SHIT" 20 GOTO 10 RUN when it says: Scroll? Press BOTH SHIFT KEYS then ENTER see what you get. I want to know what thi…

    ... the WAIT-KEY routine reprinting the edit line at every key stroke ... Nordic ROM in 1984, which has its own console input routine that ...
    Geoff Geoff May 2005 Sinclair Basic
  • List of RANDOMIZE USR code effects?Hi chaps, Does anyone have one of these please? Thanks.

    ... CompleteSpectrumROMDisassemblyThe.pdf"]The Complete Spectrum ROM Disassembly[/url] - everything ... instructions that it finds at that point. For example ... so the "instructions" at that point will be ... zero or another initialisation routine). Many of the routines ...
    monty.mole monty.mole May 2005 Sinclair Basic
  • Weird loaders; 1) Why? 2) How? (Curiosity question)Hello again. Sorry to be asking/posting so much today, but I've just arrived here and am plumbing the depths of nearly 22 years of making cups of te…

    ... ROM. In machine code it's possible to write your own routine ... , to achieve faster loading times at the expense of reliability.
    routine, it's more work to ...
    gasman gasman May 2005 Sinclair Basic
  • Game being created with Platform Game DesignerBeen playing with this since yesterday when i bought it from Cronosoft. To someone like me who cant program its excellent to create a Manic Miner st…

    ... remember correctly there's a ROM routine at address 654 (028Eh) which returns ... pressed). So your redefine key routine should CALL this address and ... be anything on the stack at that point.

    Does ...
    jonathan jonathan May 2005 Development
  • Game being created with Platform Game DesignerBeen playing with this since yesterday when i bought it from Cronosoft. To someone like me who cant program its excellent to create a Manic Miner st…

    ... remember correctly there's a ROM routine at address 654 (028Eh) which ... ). So your redefine key routine should CALL this address and ... (my first) routine in assembly to call that ROM routine, read the E ... else when the 14 bytes routine was done.

    ...
    na_th_an na_th_an May 2005 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…

    Heh Heh. Well if the ROM doesn't turn your crank, ... a period "SPkeystartrepeat" (byte)
    ; at which time it will start ... part of an interrupt service routine
    ; then time is ... by lookup table pointed
    ; at by "SPkeytranstbl".
    ;
    < ...
    Alcoholics Anonymous Alcoholics Anonymous July 2005 Development
  • how do i read the keyboard in assembly? here is the code i tried writting to find out the value of a key call 28f (hex) loop: ld a,255 cp e jr z loop ld (50000),e ret notes from what i …

    ... , put the call to the ROM inside the loop, or it ... got some keycodes with that routine, i will attempt to make ... /> hopefully i will get good at machine code one day, in ...
    mestor mestor August 2005 Development
  • FrameSyncIt was many many years ago since i programmed assembly on the spectrum but I just picked it up again for fun. Now this is one thing I can't remember…

    ... need to have interupts enabled at some point if using halt ... address 56 which is the ROM interupt handler. Basically this just ... would be returned to your routine, ie. the instruction imediately following ... to have your scroller running at the same time as doing ...
    dmsmith dmsmith August 2005 Development
  • Which assembler to useHello again, another question. As I just started fiddling with assembler I used whatever tools were in front of me. In this case, the built-in assem…

    ...
    Mark block : Shift+9 (at begin and end)
    Shift ... i.e. write a new ROM-routine which you can load later ...
    Dr BEEP Dr BEEP September 2005 Development
  • divIDE issuesI discovered a few issues with the divIDE hardware and FATware software that may be of interest to some people. 1. ROM paging If your Spectrum is a…

    ... snapshots loading. The IM2 detection routine is mistakenly overwitten by the ... 's paging port (#07ffdh), or at least the 0xxxxxxx xxxxx0x I ... ). Without measuring the delay of ROM-routine execution time, no software can ...
    zilog zilog October 2005 Development
  • divIDE issuesI discovered a few issues with the divIDE hardware and FATware software that may be of interest to some people. 1. ROM paging If your Spectrum is a…

    ... in whenever a tape routine in ZX ROM is reached so firmware ... which ones belong to loading routine (this sounds easy but it ... (for example) and EEPROM code at address XX must feed A ... , all programs that use standard ROM loader should be stored in ...
    baze baze October 2005 Development
  • SoftRom emulation possible?Hello. Quick question to all emulator developers: How easy would it be to emulate a SoftRom? The mastering utilites for my protection system XLR-8 a…

    ... modify R/W routines in ROM, because RealSpec's emulation doesn ... simple IDE emu. works not at all. I contacted Luca, and ... schemes and in R/W routine examples too (programming reference) - you ...
    piters piters November 2005 Development
  • 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 …

    ... .

    At this location in the 48K ROM and Sinclair 128 ... is used for the Interrupt routine where a negative relative jump ... back to Costa's custom routine.

    Sinclair seem not ... so Amstrad just left unused ROM locations holding zero.
    Geoff Geoff November 2005 Games
  • 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…

    ... ! I've sampled the tape at 48KHz 16-bit mono and ... /4)=998.7 T-states at 3.25 MHz, which matches ... T-states desumed from the ROM routine. So the ZX81 "bursts" really ... initial polarity flag.

    At this point I suppose I ...
    Luca Luca November 2005 Emulators
  • Interesting Custom LoadersHi everyone, I was just thinking about custom loaders on the spectrum and I thought I'd ask you all what you thought was the best one. I'd have to …

    ... . Since this program used the ROM-loader and the code had ... copying the entire ROM-routine and to prevent a RET at the end ...
    Dr BEEP Dr BEEP November 2005 Sinclair Miscellaneous
  • Pocket Clive - 2 QuestionsHello, I've just started using Pocket Clive on my iPaq pocket PC, excellent emulator BTW. 1. I have just wrote a small BASIC program to randomly pi…

    ... and incredibly simple routine which solves the ... /> If you are interested at all in this issue then ... Q. How does the randomize routine work?

    ... ; O'Hara Spectrum ROM Disassembly shows the routine.

    at all for at least the ...
    Digital Prawn Digital Prawn December 2005 Emulators
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