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<1234567…34>
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... JP to your 'real' interrupt routine. However, this doesn't work ... tstates to reach the interrupt routine:

    * M1: 7 ... have a short interrupt routine, it is possible that the routine finishes before ... set to 0x0066. An NMI routine should end with RETN, ...
    Philip Kendall Philip Kendall July 2004 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…

    ... upper border (using a short interrupt routine in IM2 to make sure ... , I'll rewrite the start routine that I've just typed ...
    ajmoss ajmoss April 2010 Hardware
  • did anybody program games for their spectrum?did anybody make games for their spectrum and have you still got them in tap/z80 format. i once attempted to make a side scrolling game but it didn…

    ... - all BASIC except a short MC routine to draw each screen - it ...
    Neil^P Neil^P December 2002 Games
  • Huffman questionI'm pretty sure that the answer to my question is "no", but I just want a second opinion: Is it possible to somehow cram a Huffman decompressor + de…

    ... play with - I think a routine that does the tree construction ... what's required (a small sort routine, a tree recursion) I'd ...
    Alcoholics Anonymous Alcoholics Anonymous July 2003 Sinclair Miscellaneous
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... JP to your 'real' interrupt routine. However, this doesn't work ... tstates to reach the interrupt routine:

    * M1: 7 ... have a short interrupt routine, it is possible that the routine finishes before ... set to 0x0066. An NMI routine should end with RETN, ...
    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…

    ... have a short interrupt routine, it is possible that the routine finishes before ... , if your IM 2 interrupt routine is just a simple EI ... width, using the smallest interrupt routine possible ("EI;RETI") though an ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • Samples on ZXWhat is the easiest way to make a sound sample (e.g. sampled speech)on Spectrum using pc samples? Suppose a have a PC .wav file and I want to transf…

    ... . TWINZ! use little more clever routine as it keeps few samples ... , play it or save just short player routine with data.
    sampling ...
    Fikee Fikee April 2005 Development
  • compilerI am currently developing a sudoku game for the old faithful speccy. My idea is to write the code in basic and then compile it to m/c because i suck …

    ... . [/QUOTE]
    hm, a short MC routine could do the job. can ...
    Fikee Fikee June 2006 Development
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... clock cycles!):
    Since a sort in a game is likely ... after the first time the sort has been run then for ... be. A more complex sort routine (quick sort, comb sort) would also be interesting ...
    JamesD JamesD September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... a look at Kiwi's sort routine (from the same thread as ... one):

    [CODE]sort: ld hl, numbers ; point hl ... swap occurred so, repeat sort
    ret ; sort complete[/CODE]


    Even that routine could be optimized futher though ...
    Matt_B Matt_B September 2006 Sinclair Miscellaneous
  • Adding AY music to your plogramI'd like to add some nice tune to my program written in machine code. I am not new to assembler programming but with music programming I have no expe…

    ... realised I need just an short assembler routine that would play e ...
    Ralf Ralf March 2007 Development
  • Adding AY music to your plogramI'd like to add some nice tune to my program written in machine code. I am not new to assembler programming but with music programming I have no expe…

    ... realised I need just an short assembler routine that would play e ...
    Alcoholics Anonymous Alcoholics Anonymous March 2007 Development
  • text routineI want to write an adventure in basic, and instead of a writing out a description for each location i want to use a kind of text compression routine …

    ... basic part is just a short input routine to let you enter ...
    dmsmith dmsmith August 2007 Sinclair Basic
  • Quick q. on MC vs. BASIC (boring question)No matter how long or tedious the programming/testing may be ... Is Machine Code [B]ALWAYS[/B] faster than BASIC?

    ... .org/wiki/Quicksort]quicksort[/url] routine, but I wrote a [url ... .wikipedia.org/wiki/Bubble_sort]bubble sort[/url] in machine code. But ... BASIC doesn't provide a sort routine at all so I can ...
    Philip Kendall Philip Kendall March 2008 Sinclair Basic
  • Quick q. on MC vs. BASIC (boring question)No matter how long or tedious the programming/testing may be ... Is Machine Code [B]ALWAYS[/B] faster than BASIC?

    ... .org/wiki/Quicksort]quicksort[/url] routine, but I wrote a [url ... .wikipedia.org/wiki/Bubble_sort]bubble sort[/url] in machine code. But ... BASIC doesn't provide a sort routine at all so I can ...
    zxspecticle zxspecticle March 2008 Sinclair Basic
  • Quick q. on MC vs. BASIC (boring question)No matter how long or tedious the programming/testing may be ... Is Machine Code [B]ALWAYS[/B] faster than BASIC?

    ... .org/wiki/Quicksort"]quicksort[/URL] routine, but I wrote a [URL ... .wikipedia.org/wiki/Bubble_sort"]bubble sort[/URL] in machine code. But ... BASIC doesn't provide a sort routine at all so I can ...
    Dr BEEP Dr BEEP March 2008 Sinclair Basic
  • Quick q. on MC vs. BASIC (boring question)No matter how long or tedious the programming/testing may be ... Is Machine Code [B]ALWAYS[/B] faster than BASIC?

    ... .org/wiki/Quicksort]quicksort[/url] routine, but I wrote a [url ... .wikipedia.org/wiki/Bubble_sort]bubble sort[/url] in machine code. But ... BASIC doesn't provide a sort routine at all so I can ...
    Metalbrain Metalbrain March 2008 Sinclair Basic
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... yourself. Write a very short interrupt routine that just does a RET ...
    BloodBaz BloodBaz October 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... yourself. Write a very short interrupt routine that just does a RET ...
    Matt_B Matt_B October 2008 Development
  • Machine Code: quicksort optimisationI came across this z80 quicksort implementation when going through the wikipedia article on the same. It's 44 bytes long. I was wondering if any of …

    ... Dutch army used Speccy to sort thousands off entries ...

    sort routine that helps sorting the symbol ... long.
    I like to sort in 2 ways, alfabetic and ... feature IMHO is that the sort is case sensitive, where Tornado ...
    roko roko August 2009 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…

    ... upper border (using a short interrupt routine in IM2 to make sure ... , I'll rewrite the start routine that I've just typed ... (or at begin of IM2 routine)
    - compare is bits D0 ...
    velesoft velesoft April 2010 Hardware
  • Use a +2/+3 case as a replacement keyboard for 48KI was just wondering if a 48K Spectrum motherboard could be housed in a +3 case, and somehow the keyboard be connected so that it could have a proper…

    ... out by experiment with a short asm routine and a bit of ...
    guesser guesser February 2012 Hardware
  • Snapshots (SNA) -> Keeping the loading screen?I've seen quite a few Snapshots (SNA) that kind of hesitate on the loading screen prior to entering the game menu... I quite like this. Anyone know …

    ... the PAUSE command or a short MC routine that would pause for ...
    Sokurah Sokurah April 2012 Emulators
  • assembly optimization: times tenDecimal numbers are not computer friendly :) Anyway, short of saying "sod it - I'll multiply by 8" - and another part of the program does indeed div…

    ... some stats and generates a sort of overall rank.

    I also sped up the sort routine from 120 seconds to 2 ... indirection. Rather than sort a 2 dimensional array, sort an index to ...
    Gedlion Gedlion August 2012 Development
<1234567…34>

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