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<1…16171819202122…34>
  • Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…

    ... of the number, plus one byte for each two BCD digits ...
    mcleod_ideafix mcleod_ideafix November 2013 Development
  • A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…

    ... this list is:
    ; 1 byte FLAGS
    ; 0..2 Page ...
    Zup Zup December 2013 Development
  • Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…

    ... this would have saved a byte every time and sometimes two ...
    David Jones David Jones December 2013 Development
  • Changing the font in z88dkEither I've got this backwards or the documentation is incorrect... :smile: "[URL="http://www.z88dk.org/wiki/doku.php?id=platform:zx"]The standard Z…

    ... is the low byte and hh the high byte of the font ...
    szeliga szeliga December 2013 Development
  • STP: Query about Dizzy prince of yolkfolk and MakeTZXI'm trying to create a TZX from my copy of Dizzy Prince of the Yolkfolk using MakeTZX 2.31 (not sure why I'm not using 2.33), but I can't seem to get…

    ... both seem to be 1 byte too long. Note that both ...
    u6c87 u6c87 January 2014 MIA/STP/SDP
  • Calculating screen address to alternative ATTR area?I'm using this small snippet of code to convert a screen address to an attribute cell address... [CODE]AttrDE: ld a, d ; get the hig…

    ... a, d ; get the high byte of screen address
    rra ... 0x58 ; set the high order byte to the start of the ...
    Sokurah Sokurah January 2014 Development
  • harvard architecture spectrum clone.I got my first +2 before christmas. I'd never given the 128k spectrums much thought, always been a 48k rubber key tradionalist. :smile: I've been me…

    ... for some of the multi byte indexing instructions that possibly have ...
    Basher Basher January 2014 Hardware
  • Using even ports for input?I've been looking for unused ports to use with my clashbasher interface. I understand that the spectrum only considers A0 when decoding its input p…

    ... with resistors. And the high byte of the address bus is ... why not set the high byte to FF so the resistors ... the cpld which outputs a byte from a eight bit counter ...
    Basher Basher January 2014 Hardware
  • DisarrayFor the sake of having some clarity [COLOR="Silver"]for once[/COLOR] I have the project data in several source files according to their types. E.g. t…

    ... supposed to have a 24 byte LUT in the middle of ... it, another 8 byte one in the beginning and ...
    Hikaru Hikaru January 2014 Development
  • mirroring bitsIf I have a string of 1408 bytes, each of which has one bit 'b' set, what's the shortest way of mirroring that string, so that each bit set at positi…

    ... '? The bit positions change from byte to byte, as they're plots ...
    Battle Bunny Battle Bunny January 2014 Development
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    ... beam reached the 1st screen byte.
    2. Load R with ...
    Hikaru Hikaru January 2014 Development
  • hash function permutation tableI'm using a simple Pearson hash function to generate keys for a $(103,6) array using a 256-byte permutation table. How do I arrange the entries in th…

    ... ,6) array using a 256-byte permutation table. How do I ...
    Battle Bunny Battle Bunny January 2014 Development
  • What to do when INT doesn't work?Due to the limitations of the Spectrum's floating point number format, two slightly different large numbers, or two slightly different small fraction…

    ... encoded with the same 5-byte value. Alternatively, the result of ...
    Battle Bunny Battle Bunny January 2014 Sinclair Basic
  • Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…

    The topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, general integer / long / char multiplications, and general textnumber conversions, so there's interest in ...
    Alcoholics Anonymous Alcoholics Anonymous January 2014 Development
  • Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…

    ... code by having my 768 byte attributes held in ram which ... , blue then the actual attribute byte. I have a screen shot ...
    Speccy_James Speccy_James February 2014 Development
  • GEDit syntax highlighting for Boriel's ZX BasicHi! I just tailored this syntax highlighting code and would like to share with he community. Suggestions are always welcome, though the file works w…

    ... />


    string
    byte
    ubyte
    long
    pkersey pkersey February 2014 Development
  • Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …

    ... 'm trying to move 18 byte wide lines from memory to ...
    Atari_Jetman Atari_Jetman February 2014 Development
  • From RAM to dim v$() "video buffer" SPEED UP!Hi! This question is related to "quick RAM copy using LET in Basic" ([url]http://www.worldofspectrum.org/forums/showthread.php?t=44296[/url]). Wel…

    ... bytes for read a byte.
    - If this byte readed from RAMPEEK ... dir,byte
    POKE dir+1,byte
    POKE dir+32,byte
    POKE dir+33,byte[/INDENT ... $(pos to pos+1)=chr$(byte)... but takes same time...:confused ...
    Hark0 Hark0 March 2014 Sinclair Basic
  • PC to +3 communicationsHi I'm going to explore the abilities of my +3 to communicate with a PC. The "natural" ways to do that would be via serial or parallel link. I've b…

    ... (timings, grouping bits into a byte, those things) or everything has ...
    Zup Zup March 2014 Hardware
  • Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…

    Just putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +2A at the moment.

    [CODE]
    ; Bi-Colour Scrolling-Buffer Game Engine for Four Player Games ...
    joefish joefish March 2014 Development
  • Tape Clear Out!Right, I'm having a clear out of all the tapes I don't want, I'll upload some cover tapes and big box lists in a bit, but to kick things off, here is…

    ...
    Rugby

    Bug-Byte
    American Football
    Glass ...
    smogit smogit March 2014 Sales
  • writing incrementally to tape without leadersI want to be able to write intermittently & incrementally to some sequential medium which is supported on any Spectrum (emulator, ie. tape); eg. [cod…

    ... missed out the flag & parity bytes and the BREAK check ...
    Battle Bunny Battle Bunny March 2014 Development
  • 4294967296 pseudo output portsIn an effort to avoid any hardware conflicts with the clashbasher interface I've been looking for an alternative to using the spectrum's ports for ou…

    ... to do is poke the byte you want to transfer into ... LD (HL),n and the byte is transfered to the cpld ... input/output instruction swapping the byte in the spectrum memory with ...
    Basher Basher March 2014 Hardware
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ... that sends and receives a byte to and from fuse program ...
    tstih tstih March 2014 Development
  • Does this addressing technique have a name?Hi All, Bit of a weird/unnecessary question, but can anyone help build on my knowledge of asm terminology by telling me what the *second* method of …

    ... 0

    This two byte number of 3861 (21+15x256 ...
    Jagd Tiger Jagd Tiger March 2014 Development
  • ZX Alien Breed - WIPI'm sure a lot of you have seen the discussion in the New Game Ideas area about a Speccy version of the classic Amiga game Alien Breed. I've been dro…

    ... straightforward and fills a control byte if QAOPM and T are ...
    LuMan LuMan April 2014 Announcements
  • Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …

    ... to give us the high byte of the screen segment.
    byte of the screen address.
    byte. That will give us our ...
    Jagd Tiger Jagd Tiger April 2014 Development
  • misunderstanding screen addressingHi I am just reading mastering machine code Toni Baker: [url]ftp://ftp.worldofspectrum.org/pub/sinclair/books/MasteringMachineCodeOnYourZXSpectrum…

    ... screen, and also the “attribute byte”. For example,
    consider the ...
    username username April 2014 Sinclair Miscellaneous
  • Thurnall Disk SystemHi guys, Has anyone else every come across a Thurnall disk system for the speccy? I got mine back in 1984/85 ish [url]https://www.flickr.com/photo…

    ... (it did contain thurnalls "snake byte" game listed as MIA - it ...
    Jonb_uk Jonb_uk April 2014 Hardware
  • Sorting BusinessThis is a little bit different from the usual game-related fare but I know there are a few people here who like this sort of thing. This is about so…

    ... be sorting unsigned integers (two byte positive numbers). I realize now ...
    Alcoholics Anonymous Alcoholics Anonymous May 2014 Development
<1…16171819202122…34>

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