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<1…14151617181920…34>
  • Why did Ultimate games load like this?What I remember about the early Ultimate games was the unusual way they loaded. You'd get the BASIC bootstrap loader, then a SCREEN$, then a main bl…

    ... the timer to a specific value (lsb=90, msb=131) and ... the CODE at 23424. The routine at 23424 does a LDIR ...
    Jimmy Jimmy February 2010 Games
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... code]
    A holds the value of key pressed
    ld ... jp (hl) ; and go to routine

    keys defm "qaopz ... up .... ; here is the up routine
    ret
    down ....
    Dr BEEP Dr BEEP February 2010 Development
  • Official CSSCGC 2010 Competition ThreadDear Wossers, As 'loser' of the 2009 competition, I am now obliged to host the 2010 competition. I have created a site which will provide a hub for …

    ... consulted by the ROM beeper routine.

    Of course ... read back what the last value was written to the ... in the game. The default value is $38 (i.e. ... $00 however, the ROM routine will instead change it (or ...
    EDIT: I use a routine like this now to set ...
    Digital Prawn Digital Prawn February 2010 Games
  • The Making Of Manic Miner"Matthew Smith talks us through every level of his classic platformer Sat at the very desk where it was written, Matthew Smith watches Miner Willy l…

    ... height text drawing routine!

    * Only character cells which need redrawing ...
    Paradigm Shifter Paradigm Shifter February 2010 Games
  • Character scrollingOk, first I'd like to say that I'm not looking for a complete routine (but that might help) because I am hoping to write it myself and learn a bit mo…

    ... scrolling, you might find this routine helpful (it produces 7 roll ... ).

    To get a value shifted right x pixels, use ... /> ld c, 0 ; first data value
    .nextroll
    push bc ...
    inc c ; next data value
    djnz .nextroll
    inc ...
    Paradigm Shifter Paradigm Shifter February 2010 Development
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ... redrawing in the interrupt service routine (also play the music too ... a dirtybuffer to only redraw cells which need updating.

    Paradigm Shifter Paradigm Shifter February 2010 Games
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ... redrawing in the interrupt service routine (also play the music too ... a dirtybuffer to only redraw cells which need updating.

    frobush frobush February 2010 Games
  • OR in a IFHi guys, I have a string that is defined by the user. I want to have an IF that does something like IF string<> a OR b OR c THEN goto 10 Hope that m…

    ... mode 1, and restore the value that was in the IY ... can just look at what value is in IY to begin ... use the BASIC interrupt service routine (wouldn't recommend it), you ... keep IY holding the "correct" value throughout, unless you disable interrupts ...
    Paradigm Shifter Paradigm Shifter February 2010 Sinclair Basic
  • shifting spriteshi. have anyone experience with shifting sprites by table ? some neat tricks ? i don't want to see complete code (really don't want, it trashes thr…

    ... I can update 128 character cells a frame) with the data ... ] then in the interrupt service routine (using interrupt mode 2), in ...
    Paradigm Shifter Paradigm Shifter February 2010 Development
  • SkoolKit 1.1In the past I've put posts like this in the Development forum, but Announcements is probably a more suitable place for them, because they're not dire…

    ... value at 28612 to toggle between 4 and 7.
    The routine ... at 30160 gets the value of 28612 ... before RET-ing back to the calling routine ... at 28429 (which begins at 28357). The value ... 28612 to a large value then the text ( ...
    Jimmy Jimmy February 2010 Announcements
  • My first platformerHi all! How do you do? Been lurking here for a while, but never had the courage to join the forum. :) The Speccy was my first computer, so I've alw…

    ... just calling the ROM BEEP routine.
    [/QUOTE]

    The ... sets BORDCR to the correct value.

    Also if you ... the border with a C routine like this:-

    [code ...
    Digital Prawn Digital Prawn March 2010 Development
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... very first things the ROM routine does is to turn the ... memoy at all, the ROM routine would, at least, execute code ... , the border color is whatever value were stored in the ULA ...
    mcleod_ideafix mcleod_ideafix March 2010 Hardware
  • tricks to simplify codingWhen i started with programming in assembler i had very simple approach to do things. Just shifting bytes around, doing simple tests and so... Later …

    I use some PRINT AT routine with BC as Y,X< ... /> JP (HL) ; jump to routine by value of A
    [/code]
    Dr BEEP Dr BEEP March 2010 Development
  • Midi out on a ZX SpectrumYears ago (may be over 15 years...) I soldered a small adapter that lets a keyboard or synthesizer connect to the ZX Spectrum 128K's midi/RS232 port.…

    ... /> An interrupt routine reads this signal and puts a value in a ... table.
    A Basic routine reads this ...
    bverstee bverstee March 2010 Hardware
  • Midi out on a ZX SpectrumYears ago (may be over 15 years...) I soldered a small adapter that lets a keyboard or synthesizer connect to the ZX Spectrum 128K's midi/RS232 port.…

    ... /> An interrupt routine reads this signal and puts a value in a ... table.
    A Basic routine reads this ...
    Spex Spex March 2010 Hardware
  • Midi out on a ZX SpectrumYears ago (may be over 15 years...) I soldered a small adapter that lets a keyboard or synthesizer connect to the ZX Spectrum 128K's midi/RS232 port.…

    ... .

    The interrupt routine sets the angle of the ... ..
    The interrupt routine saves a value specifically for that angle ... why I use the interrupt routine for that.

    ... This combination: an interrupt routine to set the angles for ...
    bverstee bverstee March 2010 Hardware
  • New member here. And a spider! :)Hello everyone. My name is Sekrets. I'm quite a lonely individual, searching for a digital home where I might find fellow speccy enthusiasts to adopt…

    ...

    to load the value of hl into de. This ... setoverpos load a 16-bit value from memory into BC using ... return value (an attribute address) is in HL.

    This routine ...
    Alcoholics Anonymous Alcoholics Anonymous March 2010 Development
  • Audio Output Filtering in EmulatorsI am messing around with various beeper-related code at the moment and have a question related to the audio output from emulators... I've written s…

    ... to compute the appropriate average value for the sample, rather than ... swift mods to my output routine and it is sounding every ...
    ccowley ccowley March 2010 Emulators
  • Double Dragon 128k - The graphicsAs you are all probably aware, I tried gathering a team of people together a few years back to make a totally re-programmed version of Double Dragon …

    ... could write an optimized sprite routine that would allow us to ... )
    to shift 16-bit value you shift with 3 registers ... mask and draw 16-bit value you access each byte of ...
    Fikee Fikee March 2010 Development
  • Midi Out from machine codeI need to send midi-signals by machine code, while Basic is too slow for my current project. I already read I can use hookcode #11E, but I have some …

    ... a call to the interrupt routine in 'BASIC' ROM1. ... #11E jumps to the routine at #11A3 (128 ROM0 ... BC,39999 ; save the value at adress 4514 in 39999 ...
    This routine should store the value at adress 4515 in ... the Midi routine, and starts with 'LD L,A' (value = ...
    bverstee bverstee April 2010 Hardware
  • Midi Out from machine codeI need to send midi-signals by machine code, while Basic is too slow for my current project. I already read I can use hookcode #11E, but I have some …

    ... :

    1. Wrote the routine underneath
    2. Started a ... and started the routine
    5. Read out the value at 50000 ... ' from rom 1... :(

    Routine:
    [FONT="Courier New"]PUSH ...
    bverstee bverstee April 2010 Hardware
  • Midi Out from machine codeI need to send midi-signals by machine code, while Basic is too slow for my current project. I already read I can use hookcode #11E, but I have some …

    ... to get back from that routine at all, out'ing ... />
    I got the value 246 at address 4515 in ... for the duration of the routine. If they need to ... be enabled while the routine is running then sys vars ... will be changed to the value contained in 23388 during ...
    nuggetreggae nuggetreggae April 2010 Hardware
  • Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…

    ... (using a short interrupt routine in IM2 to make sure ... />
    Yes, but this value is stable only on ZX ... Spectrum more interfaces then value of floating bus can ... (or at begin of IM2 routine)
    - compare is ... bits D0-D4 different value than 0 then joystick ...
    velesoft velesoft April 2010 Hardware
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... printed.

    [CODE];Call Routine with HL pointing to the ... to the next column\X value
    pop hl ;restore position ...
    rrca ;where B=Line Value (0-23)
    rrca ;where ... C=Column Value (0-31)
    rrca ;Screen ...
    Turkwel Turkwel April 2010 Development
  • Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…

    ... (or at begin of IM2 routine)
    - compare is bits D0 ... on bits D0-D4 different value than 0 then joystick support ...
    Fikee Fikee April 2010 Hardware
  • FMV on +3eOK, so about 6 months ago i posted here that i got full motion video on +3e, with a bunch of scr files called passion. I added the glider rider music…

    ... can then save the player routine to that partition later without ... sound through AY. Any other value, and it will send the ... frames
    .........
    1 byte value 255 to mark the end ...
    nuggetreggae nuggetreggae April 2010 Development
  • Exolon starsHas anyone reverse engineered Exolon?. I am looking for the address or disassembly of the code that draws/updates the stars on the main menu screen.

    ... cell scan & print/animate routine, eg it scans the attributes ... areas, and then animates the cells if it finds it can ...
    SKR SKR May 2010 Games
  • +3 how to detect if a file exist ?Need help. I am making a generic menu to my compilations over the spectrum +3. Exist some way programatically to detect if some file exists on the d…

    ... you can check on that value.
    Your code should make ... returning with the right BC value.

    Something like this ... cat-routine

    After running A holds the value of BC ...


    BTW : ANY value can be transferred to BC ...
    Dr BEEP Dr BEEP May 2010 Sinclair Basic
  • Minor Update to Gasman's Midi2BEEPDon't know whether this is worthy an announcement, but for those of you who enjoyed Gasman's midi2BEEP utility, a new variant has been made called mi…

    ... to arrive at that value by playing with the ... to tell the rom routine to do a multiplication ... snippets of code regarding BEEP routine use from other forums ... prior writing this. The routine itself is very much a ... fact that the beep routine in the rom already ...
    kgmcneil kgmcneil May 2010 Announcements
  • Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …

    ... first applies an LZ compression routine where the repeated sequences can ... the tree and not the value of the leaves. It turns ...
    Paolo Ferraris Paolo Ferraris May 2010 Development
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HitBox

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routine 9.5K 14.8K
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cells 747 1.2K

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