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  • Screen LoaderCouple days ago i find very interesting loader routine in ex Yugoslavia magazine "Svet Kompjutera" from january 1987. Authors of article, calls this …

    ... de,15535
    ld a,255
    scf
    call 1366 ...
    Dr BEEP Dr BEEP August 2006 Games
  • In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…

    [QUOTE=Paolo Ferraris]This is a good point. Anyway, if sorting is needed then I'd strongly suggest, for sprite sorting, bubblesort over the other sorting methods: it is simple, uses few memory, and - more importantly - it is very fast for almost-sorted ...
    JamesD JamesD September 2006 Development
  • CLEAR does not RESTORE the DATA pointer??According to the Spectrum manual, one of the things that a CLEAR command does RESTORE the DATA pointer. Either it doesn't actually do this, or some…

    I compiled this list of ones that I had come across for css. However they are more an indication of last-minute changes than any poor standards. The book remains one of the best manuals ever.
    The ZX81 manual had a minor error in the RND explanation ...
    Geoff Geoff September 2006 Sinclair Basic
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... l,b ; l=xpos (0-255)
    ld h,screen_xpos_table/256 ... l,b ; l=xpos (0-255)
    ld h,screen_xpos_table/256 ...
    Dr BEEP Dr BEEP September 2006 Development
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... ,b ; b holds 0 to 255
    or 192 ; a holds ... 192 to 255
    ld e,a ; e ...
    Dr BEEP Dr BEEP September 2006 Development
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... ; l=xpos (0-255)
    ld h,screen_xpos_table ... a = xpos ( 0 to 255 )
    or 248 ; a ... hold 248 to 255
    ld l,a ...
    Dr BEEP Dr BEEP September 2006 Development
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... ; l=xpos (0-255)
    ld h,screen_xpos_table ... a = xpos ( 0 to 255 )
    or 248 ; a ... hold 248 to 255
    ld l,a ...
    Dr BEEP Dr BEEP September 2006 Development
  • Which would be fasterSay you want to use a variable value of 0 to 255 in a BASIC program, which way would be fastest? Say for arguments sake you wanted to use two variabl…

    ... variable value of 0 to 255 in a BASIC program, which ...
    Matt_B Matt_B September 2006 Development
  • Games that are impossible to complete due to bugs!I'm trying to compile a list of Speccy games that cannot be completed because of a bug (or simply bad programming)! Here's a few... [B]Frankie Goes …

    ... :-

    42497,15: 42498,255: 42499,248 Ice cream
    Mr. Anonymous Mr. Anonymous October 2006 Games
  • Graphics in Basic??What is the fastest way to draw high rez graphics in Basic. Andrew.

    ... POKE 23675,88: POKE 23676,255: RETURN
    [/code]

    Arda Arda October 2006 Development
  • Graphics in Basic??What is the fastest way to draw high rez graphics in Basic. Andrew.

    ... ,0,0,0,0,0,255
    9170 DATA 4,10 ...
    Dunny Dunny October 2006 Development
  • Total Worldwide Sales?Does anyone have an accurate source showing total Worldwide sales for the ZX Spectrum (all models, incl. Timex)? I notice the Wikipedia entry for th…

    There's a link from that page to this 47 page [URL="http://zx.pk.ru/showthread.php?t=255&page=1&pp=10"]forum[/URL] discussion about Russian spectrum clones. I can't read Russian so it's not of much use to me.
    Alcoholics Anonymous Alcoholics Anonymous October 2006 Sinclair Miscellaneous
  • Total Worldwide Sales?Does anyone have an accurate source showing total Worldwide sales for the ZX Spectrum (all models, incl. Timex)? I notice the Wikipedia entry for th…

    ... .pk.ru/showthread.php?t=255&page=1&pp ...
    JamesD JamesD October 2006 Sinclair Miscellaneous
  • Programs detecting Spectrum modelsHi. I'm curious about knowing how some speccy games detect if they are runnning in a 128k or 48k model. What tricks can be used to make this in a Spe…

    [code]POKE 49152,255: POKE 23388,17: PAUSE 1: POKE 49152,0: POKE 23388,16: PAUSE 1: IF PEEK 49152255 THEN [48K mode] ELSE [128K mode]
    [/code]
    Woody Woody October 2006 Development
  • Programs detecting Spectrum modelsHi. I'm curious about knowing how some speccy games detect if they are runnning in a 128k or 48k model. What tricks can be used to make this in a Spe…

    [QUOTE=Woody][code]POKE 49152,255: POKE 23388,17: PAUSE 1:< ...
    Arda Arda October 2006 Development
  • Currah MicrosourceHi Anyone here got a Currah Microsource ? I have one, its one of the original eval units complete with 'draft' manual. Just interested to see how …

    ... and without MicroSource) except return 255 (as one would expect).
    BloodBaz BloodBaz October 2006 Sinclair Miscellaneous
  • Currah MicrosourceHi Anyone here got a Currah Microsource ? I have one, its one of the original eval units complete with 'draft' manual. Just interested to see how …

    ...
    230 REM ! ld a,255
    240 REM ! call 04c2h ... ; Start Address
    LD A,255 ; Data, (not Header) block
    BloodBaz BloodBaz October 2006 Sinclair Miscellaneous
  • How to save TZXGreetings to all. I am starting to move on from just games into some testing of home made programs. Although I could have done that in ancient tapes…

    ... of code
    ld a, 255 ; Data block , not header block ...
    BloodBaz BloodBaz October 2006 Emulators
  • Floating point representationI'm planning on picking up the [url=http://matt.west.co.tt/category/spectrum/openzxrom/]OpenZXRom[/url] project from where I left off a few months ba…

    ... its valid values are 1..255. So 0 means kinda "denormalized ...
    baze baze October 2006 Development
  • Print routine for BASIC (or BASin)For anyone interested there's a crappy binary here to print characters from BASIC at pixel positions. Import the binary at 60000, USR 60000 to initia…

    ... /> [code]
    10 LET x=255
    20 PRINT #4; AT ...
    FrankT FrankT October 2006 Sinclair Basic
  • If you could choose one extra colour for the ZX Spectrum??The post "Im not trying to start a flame war......" by Ewgf got me thinking. The ZX spectrum had 8 colours. 15 if you count the bright as separate …

    I would throw the whole Spectrum palette away and replace it with the good old EGA palette, I always liked it.

    If I had to choose only one color of it, I would go for bright red, i think it was rgb(255,128,128 ).
    cascarria cascarria October 2006 Sinclair Miscellaneous
  • Graphics Mask FormatsHi. Just a quick question. I'm curently hacking a little program to aid my in my own ZX development (i'm hoping to build a little collection of tools…

    ... 8x8/misc. sizes pics in PGD and would love to be ... again as I have used PGD quite a lot and have ...
    Skarpo Skarpo October 2006 Development
  • Graphics Mask FormatsHi. Just a quick question. I'm curently hacking a little program to aid my in my own ZX development (i'm hoping to build a little collection of tools…

    ... 8x8/misc. sizes pics in PGD and would love to be ... again as I have used PGD quite a lot and have ...
    icabod icabod October 2006 Development
  • Oh so BRIGHT!What is the SLOWEST way to change the attribute area to BRIGHT? It has to be legit! No meaningless instructions or doing stuff for the sake of it. …

    ... =0
    11 LET boxbigx=255: LET boxbigy=170
    12 ...
    Arda Arda November 2006 Development
  • Oh so BRIGHT!What is the SLOWEST way to change the attribute area to BRIGHT? It has to be legit! No meaningless instructions or doing stuff for the sake of it. …

    ... /> 20 FOR g=0 TO 255
    30 PAPER 8: INK ...
    Matt_B Matt_B November 2006 Development
  • Timex Sinclair 2068Hi guys. This is my first post here, the first of many, I hope.. :) I have a Timex Sinclair 2068 but don?t know much about it. It was given as a gif…

    ... composed of UDG characters (0-255) that are printed to the ...
    Alcoholics Anonymous Alcoholics Anonymous November 2006 Games
  • Timex Sinclair 2068Hi guys. This is my first post here, the first of many, I hope.. :) I have a Timex Sinclair 2068 but don?t know much about it. It was given as a gif…

    ... user manual, typing [b]OUT 255,6[/b] the screen mode ...
    Paulo Kathanni Paulo Kathanni November 2006 Games
  • Timex Sinclair 2068Hi guys. This is my first post here, the first of many, I hope.. :) I have a Timex Sinclair 2068 but don?t know much about it. It was given as a gif…

    ... user manual, typing [b]OUT 255,6[/b] the screen mode ...
    Fred Fred November 2006 Games
  • spiderhi remember me?im the spider you first programmed via those great mags your sinclair zx spectrum etc..i thought id drop you a quick line saying im do…

    Oh, that's a bit harsh now... come on, you must remember him surely? DATA 0,60,90,255,189,165,36,0... ah now, there you go, I can see the memories flooding back.
    gasman gasman November 2006 Chit chat
  • 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. …

    ...
    40 IF IN 64223 = 255 THEN PLOT x,y AND ...
    Arda Arda November 2006 Sinclair Basic
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