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<1…13141516171819…34>
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... letters only. Reserve the first 32 strings just to store the ... a waste to use both bits 6 and 7 exactly as ...
    Einar Saukas Einar Saukas January 2014 Brand new software
  • 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…

    ... 'h' variable is 12 bits not 8, but changing that ... old=";CODE h$(rsl+1)-32,"dup.new=";k: LET ... h$(rsl+1)=CHR$(k+32)
    95 NEXT k: ... ,47,34,76,0,32,0,0,0,60, ... ,0,70,32,0,0,53,23,32,88,4, ... else)
    d = bits = number of bits to check
    g ...
    Battle Bunny Battle Bunny January 2014 Development
  • ZX Spectrum code examplesThe shortage of sites with decent code examples seems to be few. The links to alot of sites that used to host them are disappearing into the ether. …

    ... are represented by the set bits in that byte.

    32 bytes loaded fill in the ... formula :-

    address = column + 32 * row

    where column ...
    alienbanana alienbanana February 2014 Development
  • Deterministic random number generatorI'm looking for a random number generator in assembly which, given a seed, the generated sequence is always the same. You change the seed, you get a …

    ... to get the full 16-bits. This is the one that ... random number generator is a 32-bit XorShift RNG as
    Alcoholics Anonymous Alcoholics Anonymous February 2014 Development
  • 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…

    ... . So even for nominally large 32-bit results, you have to ... require retaining the most significant bits of all multiplications.

    32-bit / 32-bit operation, eg, normally ... have to iterate a loop 32 times. This can be done ...
    Alcoholics Anonymous Alcoholics Anonymous February 2014 Development
  • 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…

    ... converts an unsigned integer (16-bits) to text in any base ... coordinate 0-31
    defb 32 ; x width in characters
    Alcoholics Anonymous Alcoholics Anonymous February 2014 Development
  • Is ESXDOS flexible enough to incorporate e.g. Spectranet commands?I was just discussing the idea with someone about the wish some people have to be able to combine interfaces such as DivIDE (Plus) / DivMMC EnJOY! wi…

    ... going to be delivering a 32-bit file offset to indicate ... to mask off the top bits to identify a (512-byte ...
    Alcoholics Anonymous Alcoholics Anonymous February 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…

    ... . I will transfer 32 bytes in one and 32 bytes in the ... serial link (baud rate, stop bits, parity, etc.) although I'm ...
    zub zub March 2014 Development
  • 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…

    ... serial link (baud rate, stop bits, parity, etc.) although I' ... an error at least every 32 bytes. I suspect this ... you use 2 stop bits to gain time for ... and read -say- 32 bytes and send 32 bytes every interrupt ... I get speed of 50Hz*32 bytes=1600 theoretical bytes ...
    tstih tstih March 2014 Development
  • 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…

    ... the delay in sampling data bits. The 16550 only has a ... if you'd be expecting 32 bytes at a time, this ... and read -say- 32 bytes and send 32 bytes every interrupt using ... I get speed of 50Hz*32 bytes=1600 theoretical bytes per ...
    zub zub March 2014 Development
  • What's the Speccy dreaming about?When I was a kid, and before I had much technical knowledge, I sometimes used to run random OUT x,y commands on my old grey +2 to try to produce inte…

    I think it's just bits of random junk from the ... but the screen width is 32, so you get a pretty ...
    leespoons leespoons April 2014 Sinclair Miscellaneous
  • Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…

    ... />
    [CODE]
    REPT 32
    ldi
    ENDM[/CODE ... could always just type out 32 lines of LDI, :)
    REPT 32
    ldi
    ENDM< ... by 8 and multiply by 32
    rlca ; net ... /> and 224 ; mask off bits we don't want
    polomint polomint April 2014 Development
  • 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…

    ... I want to avoid rare 32 minute sorts :D )

    bits variable "balance", initialized to zero ...
    Alcoholics Anonymous Alcoholics Anonymous May 2014 Development
  • Fast and easy read/write of attributes?What are the fastest or easiest ways to check the attributes of tiles on the screen, in BASIC? It seems to be a great way of storing object info. …

    ... position.
    rrca ; multiply by 32.
    rrca
    rrca
    and 3 ; mask bits for high byte.
    add ... /> ld a,l ; get x*32 again.
    and 224 ; mask ...
    polomint polomint June 2014 Sinclair Basic
  • Official Basinc thread - Bug reports and other discussionI just released a new BASin fork, basinc. The first official release was V16r2, and today it's r3. it's uploaded to wos archive and alternatively, h…

    ... -bit RGB palette. Only two bits are used for blue because ... the same, you can set 32 different PAPER colors and print ...
    chev chev June 2014 Sinclair Basic
  • 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…

    ... /> [00..31] - Pixel data
    [32..35] - Attribute values for the ... an elaborate scheme?

    32 bytes - bitmap
    4 bytes ... another table for action bits - 8 action bits per element
    and ...
    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…

    ... elaborate scheme?

    32 bytes - bitmap
    4 bytes ... />


    [QUOTE]32 bytes - bitmap[/QUOTE]
    [00 ... bytes - colorize[/QUOTE]
    [32..35] - Attribute values for the ... table for action bits - 8 action bits per element[/QUOTE]< ...
    polomint polomint June 2014 New game ideas
  • Test screens for ZX PrismNot sure that this is *really* the right section for this request, but it's relating to new hardware I'm developing so let's start it off here - a mo…

    ... replacement DAC will give 4 bits per colour element. The "ULA2 ... allows for up to 8 bits per colour element but ZX ... itself is limited to 4 bits per colour in hardware due ... for ink and paper) 32 colour (2 bits to select 4 levels ...
    JeffB JeffB July 2014 Hardware
  • Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …

    ... /> add hl,bc ;HL=22528 + 32*y + x
    push hl ...
    RRA ;rotate 3 lo-bits of y ...
    RRA
    POP BC
    LD A,32
    ADD A,L
    ld hl,32
    ld d,h
    Battle Bunny Battle Bunny July 2014 Sinclair Basic
  • Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …

    Here's a much neater version of my previous post. Using IX for addressing the parameters simplifies the assembler code. The original routine needed all its parameters to be correct beforehand, as it was only doing a check on y, whereas all of x, y, x+w, y+ ...
    Battle Bunny Battle Bunny July 2014 Sinclair Basic
  • 48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…

    ... one of the eight data bits that make up a 8 ... "upper" DRAM chips, each has 32,768 (32k) one bit memory ...
    1024MAK 1024MAK August 2014 Hardware
  • 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]…

    ... () kicks out a raw 8 bits of random number.
    UpdatSeed ... that it only gets 24 bits of FRAMES data.

    32 bit, with a fixed decimal ...
    Gedlion Gedlion September 2014 Development
  • Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…

    ... address) being the last 7 bits, that is: Y4 Y3 X7 ... its values). This happens every 32 scan lines. Each scan line ... , so the complete run lasts 32*64 = 2048us = 2.048ms. Slighly ... have its 7 less significant bits with the same value as ...
    mcleod_ideafix mcleod_ideafix September 2014 Development
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    What electronic parts / bits do you have ?

    ... have an impedance of around 32 ohms?

    Do you ...
    1024MAK 1024MAK September 2014 Hardware
  • Game of Life.Last year (I think) or maybe the year before, I entered a Game of Life simulator into the CSS CGC compo but for the Sinclair ZX81. I decided to port…

    ... in a couple of inappropriate bits. Here's the corrected one ... /> DIM g$(20,32): DIM p$(20*32*3): LET gen=0 ... : LET bc=den=((i-1)*32)+USR InitG: NEXT i:
    23 LET p=22528+r0*32+c0: LET a=PEEK p ...
    Battle Bunny Battle Bunny October 2014 Sinclair Basic
  • Robot SantaAlien Ferox has grown beyond what could be accomplished on a humble Speccy - i've run out of memory AND ideas so that's indefinitely halted. BUT In…

    ... />
    DISPLAY B
    PUTBLOCK 32

    Shows on the ... i've had to redraw bits of screens to ensure players ...
    SimonLCFC SimonLCFC November 2014 Brand new software
  • Adventure helpLooking for help in re-naming adventure game classes to a spectrum based class system for a mud I'm working on. I.e. a Thief could be a hacker. ( wi…

    ... superior to all other 8 bits)
    Drow - Black +2A User ... - 48k User
    Lizardman - Dragon 32 User
    Sea-Elf - BBC ...
    The Lone Magpie The Lone Magpie November 2014 New game ideas
  • 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 …

    ... must have of the 8 bits.

    Also;

    32 16 color hardware sprites etc ...
    Fizza Fizza November 2014 Games
  • 64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…

    ... (so 32 x 24 = 768 ) and use four of the bits within ...
    bobs bobs December 2014 Development
  • Snowfall effectHow do you go about creating a snowfall effect like the one in Yeti? Now don't laugh, I'm currently printing 32 UDG's of dots OVER the top of my gam…

    ... by 8 and multiply by 32,
    rlca ; net calculation: multiply ... .
    and 224 ; mask off bits we don't want.
    R-Tape R-Tape December 2014 Development
<1…13141516171819…34>

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    Renegade on April 21
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