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<1…16171819202122…34>
  • PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…

    ... starting at leftmost pixel in byte
    jr z, norotate ; if ... /> rotate: ; else rotate pixel mask right 'b' times

    rra ... the X and Y coordinates (8-bit bytes) and shuffling them ... move up, down, left or right from the current pixel position ...
    Alcoholics Anonymous Alcoholics Anonymous January 2012 Development
  • Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…

    ... so you'll need 240*8=1920 bytes. Add 240 bytes ... screen is at the left, right, up or down the ... /> ;DE points to the 704 byte buffer
    ;Affected registers: ... ;If BC0, then go next byte
    or c
    ...
    mcleod_ideafix mcleod_ideafix January 2012 New game ideas
  • Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…

    ... so you'll need 240*8=1920 bytes. Add 240 bytes ... screen is at the left, right, up or down the ... /> ;DE points to the 704 byte buffer
    ;Affected registers: ... ;If BC0, then go next byte
    or c
    ...
    DaRkHoRaCe DaRkHoRaCe January 2012 New game ideas
  • LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…

    ... BASIC to get the logic right. It works, in that it ... take 9 bits instead of 8 (taking more space than before ... /> If I interpreted your code right, you're encoding here 2 ... when there's a 1 byte lenght match (why?), and 4 ...
    Metalbrain Metalbrain March 2012 Development
  • Reading interface 2 using the IN commandHow do you read using the IN command from BASIC? You can read multiple keys at once, but I cant remember the values...

    ... calculate the number, the first 8 bits are all 1 but ... look-up (counting from the right), which is 0. The next ... 8 bits are 11111110, which is ... 61438, you will get a byte, which five less-significant bits ...
    na_th_an na_th_an March 2012 Sinclair Basic
  • A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…

    [QUOTE=Timmy;594378]Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how easy it actually is. (Actually I've already published this one some time ago, but this ...
    AndyOaks AndyOaks March 2012 Development
  • Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …

    ... /> cls ld b,8 ;8 bits to rotate out per byte
    loop ... /> sla (hl) ;nope, shift the byte
    jr cloop ;keep going ... nice looking one is the right to left wipe, now I ...
    R-Tape R-Tape March 2012 Development
  • Exilei\'m sure this has been brought up before but couldn't find a thread in 'New Game Ideas'. Why did the Spectrum never get a port of the BBC game Exile…

    ... can do the pre-shifted scroll in a spare uncontended bank ... scrolling, at less than 8 pixels (one byte, which you can easily ... moving bits around within a byte, and overflowing into the next ... byte, which is fiddly and time- ...
    joefish joefish March 2012 New game ideas
  • New Game! Uwol '81 [ZX81][img]http://www.mojontwins.com/wp-content/uploads/2012/03/s1.png[/img] Yup, we have ported our most-ported game to date to the good ol' ZX81! Using …

    ... games char cell movement looks right & other times not ... object that's only 8 pixels across is going ... to look jumpy moving in 8 pixel steps. Something 64 ... good as a pixel scroll running 8 times as fast. But ... if it's a character scroll ...
    joefish joefish March 2012 Brand new software
  • 28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…

    ... you move horizontally by 8 pixels you couldn't ... then they're two-byte instructions, which take 4 ... T-states longer (or 8 if contended) than the ... treat everything as a 2-byte instruction. And instead of ... in the furthest left and right columns of the viewport, ...
    joefish joefish April 2012 Development
  • 28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…

    ... you move horizontally by 8 pixels you couldn't ... then they're two-byte instructions, which take 4 ... T-states longer (or 8 if contended) than the ... treat everything as a 2-byte instruction. And instead of ... in the furthest left and right columns of the viewport, ...
    R-Tape R-Tape April 2012 Development
  • BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…

    ... a bit more and added byte-level control, using Einar's ... byte (shifting the rest of the row 8 pixels to the right), and right ... -clicking decreases it's width by 1 byte (to ... your image from left to right, because once you get into ...
    ccowley ccowley April 2012 Announcements
  • about Back to SkoolHi All, Back to Skool today! :) [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0000362[/url] I got original tape and make samples for side a …

    ... guess 1997 would probably be right. I remember being in contact ... you can drop the one byte and it'll still load ... 7 bits instead of 8 for the last byte so dropped it ...
    richl richl May 2012 MIA/STP/SDP
  • Scrolling a mapCan someone explain in idiots terms how you scroll a map. I'm not after code as such, just an explanation of how it can be done. I'd like to scroll…

    ... precise amount you want to scroll.

    Finally, you copy ... the precise scroll position. You can do this with byte (8 pixel) positioning ... each rotation onto the next byte in the line, so that ...
    joefish joefish May 2012 Development
  • Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…

    ... , even if you want to scroll 22 lines only, ld h ... address before copying&celaring byte and if it is in ... a matter of setting the right attribute instead of "ld (hl ... if it is clearing attribute byte then put your default attribute ...
    ub880d ub880d May 2012 Development
  • Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…

    ... default attribute to yours ;] 4*8+0 is green (4) ... ink, then put there 0*8+0 = 0[/QUOTE]
    ... got this right? When you said you wanted to scroll one ... that you wanted to scroll all but one column ... a routine to selectively scroll a character column of ...
    zxbruno zxbruno May 2012 Development
  • Microhobby's Pixel A Pixel compo: help requiredHi! The start of this story is described in this topic: [url]http://www.worldofspectrum.org/forums/showthread.php?t=38955[/url] At the present mome…

    ... required in our case. Scroll the preview window here ... Channels" tab in lower right toolbar of Photoshop and choose ... list.
    4. Right click the selection on ... br />
    7. Right click the image with "selection ... img]

    8. Now we can manually adjust ...
    moroz1999 moroz1999 May 2012 Sinclair Miscellaneous
  • Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…

    ... ,b,c parameters for n=8 and four seeds (I first ... sure I got it all right). There are six sets of ... ) variant, the result being the 8 bit in the A register ... that is almost aligned on byte boundaries. But since I need ...
    Alcoholics Anonymous Alcoholics Anonymous May 2012 Development
  • 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 …

    ... QUOTE=Hikaru;632315]I know right? Just posted it for the ... /> ld h,192 ;high byte of a table containing 'letter ... down
    add a,8
    ld h,a< ... 0 ;spacer for exit zero byte
    defw block1
    ... in both high & low byte
    defb 253
    ...
    R-Tape R-Tape June 2012 Development
  • General purpose full screen input routineHi Folks, One of the things that annoyed me back in the 1980s with most BASICs was the lack of a full screen "formatted" input function. You could …

    ... : "PRINT AT 0,0;CHR$ 8;" and it's 22783 - in ... coloured squares appear down the right-hand side if a character ... overwrites eight bytes in 256 byte steps from 22783 to 24575 ... I was using the 96-byte validation table idea, then at ...
    Battle Bunny Battle Bunny June 2012 Sinclair Basic
  • 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 …

    ... when using the left (or right) item as pivot produces worst ... lib forming based on 2-byte items (ie pointers) that includes ... partition gets small enough, say 8 elements or less.
    [/QUOTE ...
    Alcoholics Anonymous Alcoholics Anonymous June 2012 Development
  • Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …

    ... that needs to be right first time otherwise the ... released.

    - The 8-bit header (row) will be ... very fast)
    READ 8-pin header current status
    8-pin header is just the high byte of ... clocked) to read the 8-pin header (which may have ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • 40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…

    ... ;

    err5:
    rst 8 ;
    defb 4 ;

    ld b, 8 ;

    prnlp:
    ... /> djnz rotlp ; each byte is in the right colour.

    ... /> ld a, (coords_y) ;
    sub 8 ;
    ld (coords_y), a ;
    chev chev August 2012 Development
  • 40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…

    ... 8,8,16,8,8,12
    defb 0,8,8,8,8,8,8,8
    defb 0,24,8,8,4,8,8 ... HL points to 1st byte of new channel data< ... Save address of 2nd byte of new channel data
    byte of output routine
    ... MSB 11xxxxxx = shift-to-right/2 00=0 01= ...
    uglifruit uglifruit August 2012 Development
<1…16171819202122…34>

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