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  • Beautiful codeSome people see beauty or something sublime in maths formulas and equations, can anyone suggest examples of beautiful or sublime programming?

    ... beautiful (eg, data aligned on 256-byte boundaries).

    Also mentioned ...
    Alcoholics Anonymous Alcoholics Anonymous May 2014 Development
  • Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…

    ... (if placing shift table on 256-byte boundary) by using JP (HL ...
    tstih tstih May 2014 Development
  • UDG tricks?I always enjoyed using [URL="http://www.worldofspectrum.org/ZXBasicManual/zxmanchap14.html"]UDGs [/URL]for the 'sprites' in my games, when I coded th…

    ... anywhere in memory. The high byte of this is initially 255 ... ; the low byte is 88. Combining the two ... . It should be one byte below the first address we ... to (remember the low byte setting of 88 hasn't ... system variable, to jump in 256-byte steps.
    joefish joefish June 2014 Sinclair Basic
  • So shooting 360 degrees?...[I]How do I go about having - for example - a cannon in the middle of the screen, that can shoot in any direction towards the player?[/I] Well, I do…

    ... number, where the upper byte is the number of ... whole pixels; the lower byte is the fractional part. ... like 128 angles (thus a 256 byte table).

    ... .5) in the lower byte is, lets say you ... subtraction carries into the upper byte, and so your bullet ...
    joefish joefish June 2014 Development
  • Porting Blues Brothers CPC->ZX...just an ideaI've just watched a video of the CPC version of the Blues Brothers games by Titus [url]http://www.youtube.com/watch?v=6DOj-Ta3Ek4...Based[/url] on th…

    ... compression obv... Would need another byte or two for each tile ... do, although just an extra byte per tile can give 8 ... go with more than one byte per tile - that's a ... . I'd keep a separate 256 byte table that holds properties for ...
    Sokurah Sokurah June 2014 New game ideas
  • Porting Blues Brothers CPC->ZX...just an ideaI've just watched a video of the CPC version of the Blues Brothers games by Titus [url]http://www.youtube.com/watch?v=6DOj-Ta3Ek4...Based[/url] on th…

    ... go with more than one byte per tile - that's a ... . I'd keep a separate 256 byte table that holds properties for ...
    polomint polomint June 2014 New game ideas
  • Porting Blues Brothers CPC->ZX...just an ideaI've just watched a video of the CPC version of the Blues Brothers games by Titus [url]http://www.youtube.com/watch?v=6DOj-Ta3Ek4...Based[/url] on th…

    ... tile consists of :

    [byte]
    [00..31] - Pixel data ... /> next
    you can use 256 byte table for tile description
    Jerri Jerri June 2014 New game ideas
  • Porting Blues Brothers CPC->ZX...just an ideaI've just watched a video of the CPC version of the Blues Brothers games by Titus [url]http://www.youtube.com/watch?v=6DOj-Ta3Ek4...Based[/url] on th…

    ... /> next
    you can use 256 byte table for tile description

    [QUOTE]you can use 256 byte table for tile description[/QUOTE ...
    polomint polomint June 2014 New game ideas
  • SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…

    ... right (don't forget the 256 byte table)

    I found ... the player to a 3 byte buffer

    copy the ... ) and on a couple of 256 byte tables for detection methods - thus ...
    MatGubbins MatGubbins November 2014 Development
  • SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…

    ... right (don't forget the 256 byte table)

    I found ... the player to a 3 byte buffer

    copy the ... ) and on a couple of 256 byte tables for detection methods - thus ...
    polomint polomint November 2014 Development
  • SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…

    ... the mirrroring table on a 256-byte page boundary, so you set ... the upper byte of a register to point ... the table, put your data byte in the lower 8 bits ...
    joefish joefish November 2014 Development
  • SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…

    Mirroring is done one of two ways, if you have memory, then you store it mirrored for speed.
    If you don't have memory, then you use the 256 byte buffer page aligned.
    Baggers Baggers November 2014 Development
  • SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…

    ... if I'm understanding the 256 byte table thing right, you could ...
    Morkin Morkin November 2014 Development
  • Speccy Vs Amstrad CPC Vs C64I hope no one minds me posting this here as well as in the announcements section. I'll delete it if there is a problem. It's childish fun but can I …

    ... to get up to 21 256-byte sectors per track where an ... has 8 or 9 512-byte sectors. Therefore it's capable ...
    Matt_B Matt_B December 2014 Games
  • Speccy Vs Amstrad CPC Vs C64I hope no one minds me posting this here as well as in the announcements section. I'll delete it if there is a problem. It's childish fun but can I …

    ... to get up to 21 256-byte sectors per track where an ... has 8 or 9 512-byte sectors. Therefore it's capable ...
    Jimmo Jimmo December 2014 Games
  • CMWC random number generator for Z80Seeing the interest regarding the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=23070"]Xor-Shift random number generator for Z80[/URL]…

    ... br /> db (table+10)%256
    db 102
    db (table+12)%256
    db 116
    db table%256
    db 15
    ... table must be within single 256 byte block"
    endif
    Patrik Rak Patrik Rak May 2015 Development
  • CMWC random number generator for Z80Seeing the interest regarding the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=23070"]Xor-Shift random number generator for Z80[/URL]…

    ... br /> ld a,(hl) ; da = 256 * y + cy

    ... with table restricted to single 256 byte block:

    ... br /> ld a,(hl) ; da = 256 * y + cy

    ... table must be within single 256 byte block"
    endif
    ...
    Patrik Rak Patrik Rak May 2015 Development
  • Mirror tableCan anyone help with a byte mirror table? e.g. so you can look up a byte of a left-facing sprite and return the correct right-facing value. There …

    ... is typically aligned to a 256 byte boundary. Here, if let's ... say you have the high byte of the table address in ... also need to reverse the byte order, therefore step over the ...
    Hikaru Hikaru August 2015 Development
  • Best Z80 Assembler for PC?There's probably already a thread for this so if somebody could please point me at it I'd appreciate it. If there isn't then please respond here wit…

    ... br />
    - 256-aligned data section
    - 256-aligned data section ... br /> defc ORGADDR = $10000 - (256*((SIZE / 256) + 1))
    ELSE
    ... is ORGed at a 256-byte aligned address and is ... it will also be a 256-byte aligned. du follows da2 ...
    Alcoholics Anonymous Alcoholics Anonymous October 2015 Development
  • Fixed point math lib?Is there a liberally licensed fixed point math lib for z80 somewhere? When searching, I expected to find a bunch of GPL'd ones and perhaps one or two…

    ... has to be on a 256 byte boundary to work correctly. This ...
    melkig1967 melkig1967 December 2015 Development
  • Fixed point math lib?Is there a liberally licensed fixed point math lib for z80 somewhere? When searching, I expected to find a bunch of GPL'd ones and perhaps one or two…

    ... placing the tables on a 256 byte boundary and effectively using 'l ...
    melkig1967 melkig1967 December 2015 Development
  • Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…

    ... be located within 256-byte boundary,
    ; and last byte from this table ...
    Einar Saukas Einar Saukas April 2016 Development
  • I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…

    ... (such as: JP HL or 256-byte aligned tables...)
    1. Compile ... 101h? Because this affects 2 byte address. If you compiled your ...
    tstih tstih August 2016 Development
  • Best place to start learning assembly on WOS ?So I'm pretty new at this forum but not the Speccy so my BASIC is pretty good. I can see lots of resources on WOS for doing machine code/assembly but…

    ... to work out the nearest 256-byte page boundary to an address ...
    joefish joefish October 2016 Development
  • I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…

    ... (such as: JP HL or 256-byte aligned tables...)[/quote]

    256-byte boundaries.

    I ... settled on a 256-byte relocation limit (i.e. only ... wrapping of the low byte into the high byte.

    ...
    u6c87 u6c87 October 2016 Development
  • I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…

    ... the two .bin files. Byte by byte. For identical binaries the differences ... of high and of low byte of these addresses will be ... HL, use stack to jump, 256-byte boundary allocations, etc...) are used ...
    tstih tstih October 2016 Development
  • I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…

    ... HL, use stack to jump, 256-byte boundary allocations, etc...) are used ... work in all cases except 256-byte aligned unless you keep relocation ... offsets to multiples of 256 bytes. I hadn't thought ...
    Alcoholics Anonymous Alcoholics Anonymous October 2016 Development
  • I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…

    ... work in all cases except 256-byte aligned unless you keep relocation ... offsets to multiples of 256 bytes. I hadn't thought ... , can you elaborate on the 256-byte alingment you talk about above ... correctly if aligned on a 256-byte boundary?
    u6c87 u6c87 October 2016 Development
  • I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…

    ... you elaborate on the 256-byte alingment you talk about ... correctly if aligned on a 256-byte boundary?[/quote]

    256-byte aligned table inside the executable ... generate code dependent on 256-byte aligned data structures so ...
    Alcoholics Anonymous Alcoholics Anonymous October 2016 Development
  • I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…

    ... object doesn't cross a 256-byte boundary, unless the alignment is ...
    u6c87 u6c87 October 2016 Development
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Latest Posts

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  • Where to Buy the New or Fairly Recent , Excellent ZX Spectrum Games Software?
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  • Mis-labeled cassette titles or a name change?
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  • Frankie's ZX Spectrum Digouts
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