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Search Again :: Adv Search 1000 results in 0.042s
<1…567891011…34>
  • 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 ... to program - release relocation table (no need for it anymore ... there will be a table of defw that will ... in all cases except 256-byte aligned unless you keep ... until tstih brought it up above.
    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…

    ... 256-byte boundary?[/quote]

    If someone has created a 256-byte aligned table ... generate code dependent on 256-byte aligned data structures ... was truly horrible and showed up frequently enough.
    < ... it can be, further up the foodchain inside the ...
    Alcoholics Anonymous Alcoholics Anonymous October 2016 Development
  • New Game - Pietro Bros [z88dk/Nirvana+][b]PIETRO BROS[/b] Pietro and Luizo were transported to pipe world after eating some rancid mushrooms on his pizza. Help them to escape from th…

    ... nirvana_halt inserted someplace to sync up. Inserting a conservative nirvana_halt at ... 's something to have a look at.

    There ... to the top of this 256 byte page).

    The zx7 ... of memory available. The last byte segment is AY music and ...
    Alcoholics Anonymous Alcoholics Anonymous December 2016 Brand new software
  • ZX GameDev tools consolidatedHello WoS! It's been a while, yet with a plenty of decent gamedev tools (including new ones!), is there a [i]single/pivot table[/i] or some datash…

    ... required some tables to be 256-byte aligned.

    * sp1 can ... are some restrictions on table locations due to 256-byte alignment.

    up a lot of time to ...
    Alcoholics Anonymous Alcoholics Anonymous January 2017 Development
  • disk access & other peripheral docs?The documentation at http://www.worldofspectrum.org/faq/reference/ and thereabouts is fairly complete when it comes to programming the speccys, but t…

    ... /> I could dig up some conversations from these ...
    You have to look up each disk system's manual ... assume it will show up in documentation if you ... systems are primitive, take up memory space, or integrate ... the printer buffer as 256-byte disk buffer. I don ...
    Alcoholics Anonymous Alcoholics Anonymous May 2017 Development
  • disk access & other peripheral docs?The documentation at http://www.worldofspectrum.org/faq/reference/ and thereabouts is fairly complete when it comes to programming the speccys, but t…

    ... ;907684"]
    You have to look up each disk system's manual ... and requires you to set up a basic command in a ... use the printer buffer as 256-byte disk buffer. I don't ... -dos manual, and it does look rather primitive. I can only ...
    Sol_HSA Sol_HSA May 2017 Development
  • Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…

    ... a variable for each stored byte. Just label the beginning of ... of the code will then look like this:

    [code ... address to a 256-byte boundary, you can speed up the code a ...
    Ast_A_Moore Ast_A_Moore September 2017 Development
  • Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…

    The table should have the flipped byte at the appropriate index, i. ... you can directly look up the flipped version of the byte. It's ... , by just using a different table)
    AndyC AndyC December 2020 Assembler
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... column to 0.
    Look up the CP instruction, flags ... 64
    ; modify this table to be based at #4000 ... e, (hl) ; e = low byte of screen address
    inc ... ; hl points to high byte of screen address
    ... d, (hl) ; d = high byte of screen address
    ex ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • ANNOUNCE: Jet Set Willy Construction Kit (JSW CK 1.0)Today I release Version 1.0 of my Jet Set Willy Construction Kit (JSW CK): the program I used to write We Pretty, Jet Set Willy: The Lord Of The Ring…

    ... either access the guardian-class table via the guardian-instances in ... browse the guardian-class table and look up all instances of a guardian ...
    andrewbroad andrewbroad July 2003 Games
  • The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…

    ... 256 times
    ld b,(hl) ; B = high byte ... byte in table
    ld e,(hl) ; Fetch 'last' byte in table ...
    prbyte ld a,(hl) ; Fetch byte for ... prbyte ; Print byte from screen
    table defb 13,27 ...
    Dr BEEP Dr BEEP September 2004 Development
  • Mode 2 Tile Editor SourceA Timex Mode 2 Tile Editor incorporating a byte mirror table. The compiled version is available in the CSSCGC 2008 collection from the WoS archive. …

    ... 2 Tile Editor incorporating a byte mirror table. The compiled version is ... /> ; ------------
    ; MIRROR TABLE
    ; ------------
    ;
    ; A 256 byte lookup table to mirror the ... bitmap contained in a single byte< ...
    chev chev January 2007 Development
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... which can contain one of 256 character codes as background. ... cannot be generated in just 256 UDGs. Instead plot graphics ... This is called bottom up development where we identify and ... strtok() works, look it up under the strings library. Also look up the new ...
    Alcoholics Anonymous Alcoholics Anonymous June 2007 Development
  • Tile Map HelpI've got a 256x256 map. This is split into 64 chunks of 32x32. Each cell takes up one byte so only four chunks are held in memory at any given time. …

    ... 32x32. Each cell takes up one byte so only four chunks are ... . It means I have to look up each cell individually, but it ...
    chev chev July 2008 Development
  • So what about ethernet and ZX BASIC?Well, as of about 5 minutes ago, ZX BASIC for the first time properly wrote some packets to the network! OK, so it isn't perhaps 100% what Andrew Ow…

    ... />
    Spectrum streams work a byte at a time, which would ... whole packet just for each byte!) and very slow, so under ... on - each stream has a 256 byte buffer in a page of ... character, or the buffer filling up. (Once I've got input ...
    Winston Winston July 2009 Hardware
  • Covering your hardware...Hey, you WoSsers remember "back in the day" people would have special covers for their printers(typewriters) or even computers? I remember these din…

    ... /> EDIT: Sidenote, I tried to look up special slip-covers for computers ... and had to come up with this search-string to ... -sofa -cd -couch -map -seater -table -casual -suede -"sure fit" -loveseat ...
    ZnorXman ZnorXman February 2011 Chit chat
  • Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…

    ... that i've came up with so far but ... ld (hl),a ; ... draw last byte here


    ... and point to next byte of tile table
    inc hl ... to next address in tile table, store it here
    ... 35468 ; Point SP to address table

    ld a ...
    Zoltar Zoltar September 2011 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]…

    ... c,e
    ld hl,table
    add hl,bc< ... br />
    ret

    table
    db 82,97,120 ... /> As you can see, the table access is quite expensive compared ... computation itself. Having the table aligned to 256 byte boundary could be used ...
    Patrik Rak Patrik Rak June 2012 Development
  • Rendering clipped glyphSometimes you need to render a glyph of arbitrary size to the screen. And clip it. For example: drawing a mouse cursor means combining drawing of a…

    ... glyph_t *glyph,
    byte x,
    byte y,
    rectangle_t *clip_rect ... address table (using standard trick with two tables on 256 byte boundary ... point 12 then first byte mask will be 11111110 ... and end byte mask will be 00000111. ...
    tstih tstih October 2013 Development
  • z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…

    I set up a minimal IM2 mode so ... 0xd4, 257); // initialize 257-byte im2 vector table with all 0xd4 bytes ... , this will start the manager up and enable interrupts
    < ... /> ld a,200 ; high byte of pointer table location.
    ld i ...
    slenkar slenkar October 2013 Development
  • Born again Speccy user with problemsHello all, Firstly I'd like to say a big hello - this is my first post! When I was 8 or 9 or so my dad bought a ZX Spectrum 48K and a whole bunch o…

    ... I'm a 'responsible' grown-up I started getting really into ... 23732 + PEEK 23733 *256

    This came up with the result ... was 87. According to the table - this means IC 16.
    namtip namtip January 2014 Hardware
  • What's the deal with hash tables, anyway?As there's nothing in the [url=http://www.users.globalnet.co.uk/~jg27paw4/pourri/0-surc-contents.htm]Compendium[/url] about hash tables, and as I've …

    ... welcome.

    A hash table is the means of implementing ... ; yak. If I want to look up information about my cows, how ... hash keys:
    [*]a hash table, associating hash keys with data ... to the limiting of hash table sizes to prime numbers.) Remember ...
    Battle Bunny Battle Bunny January 2014 Sinclair Basic
  • Interupt service routinehas anyone set up a interupt service routing with pasmo? this one I tried resets the speccy EDIt- I placed the code after the END directive, I fi…

    has anyone set up a interupt service routing with ... /> ld a,254 ; high byte of pointer table location.
    ld i ... ,a ; set high byte.
    im ...
    slenkar slenkar April 2017 Development
  • Need the title of the Sinclair Basic manual to look for itI had a copy but I've lost the USB chip it was on! I need it to look up commands because some Basic programs I looked at all used the command MOD and…

    ... on! I need it to look up commands because some Basic programs ...
    mik3d3nch mik3d3nch January 2019 BASIC
  • AticAtac DisassemblyHi Guys, I've been spending quite a bit of time the last 2-3 weeks working on the AticAtac disassembly, evolving it into a much more documented as…

    ... and commented and sprites and look up tables labelled and commented.
    byte-for-byte match to a reference ...
    BloodBaz BloodBaz March 2019 Assembler
  • Tales of hate and despair in 8-bitsThis topic seeks to shed some light on one of the most obscure questions a spectrum user can ask. Why do we hate Commodore?

    ... arise. you'll just end up always asking why. you ... the way it's set up, that the other person ... i'll probably just end up getting an old playstation ... tell liked or grew up when games were good ... could give the Spectrum 256 colors ) ... look at the C64s processor ...
    Amigo Amigo May 2003 Sinclair Miscellaneous
  • 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…

    ... you used one byte per symbol in a table to record frequency ... , you would have enough information in 256 ... can tolerate more error the 256 byte table can be shrunk. When you ... as the decoder's frequency table.

    The actual ...
    Alcoholics Anonymous Alcoholics Anonymous July 2003 Sinclair Miscellaneous
  • help in byte mirroring.I need some help. What is the best way to mirror the byte? (for ex. 10010011 -> 11001001) I mean, if there is a simple way to do it (may be with OR, …

    ... same method as Cyborg's table look-up except I got paid for ...
    Geoff Geoff October 2003 Development
<1…567891011…34>

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