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<1…11121314151617…34>
  • Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…

    ...
    ld (iy+0), c ;bits[i]=b1
    push hl ... /> exo_dontgo:
    ld de, 1024+32
    jr z, exo_goforit
    antoniovillena antoniovillena November 2012 Development
  • Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…

    ...
    ld (iy+0), c ;bits[i]=b1
    push hl ...
    antoniovillena antoniovillena November 2012 Development
  • BBC Micro from 2012 (almost)I just replaced the Raspberry Pi (the original one I had was stolen...grrr) with one of the new v2 boards. RiscOS has just been made available for th…

    ... counter with status bits in the remaining 6 bits), for some time ... ARM has used a 32 bit ...
    Winston Winston November 2012 Chit chat
  • Code execution logging/profilingAs revealed in [url="http://www.worldofspectrum.org/forums/showthread.php?t=41666"]this thread[/url], I'm adding support for reading code execution l…

    ... 256x256 PNG, with black bits = code, white bits = non-code.

    for y in range(32):
    row = []
    for x ... in range(32):
    data = []
    for i ...
    SkoolKid SkoolKid December 2012 Emulators
  • 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 …

    ... we want encode sequence of bits.

    First ... a lot of common bits into 32-bit number. That is ... br /> all leading zero bits in offset until and ... br /> all leading zero bits in length until and ... simple predictor for few first bits of literal).

    catmeows catmeows January 2013 Brand new software
  • 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 …

    ... suggestion would use many more bits, although adding lots of zeroes ... compensate the increased number of bits.

    There's no ... increase by these number of bits in average
    [*] [B] ... | 5.58 | 86.28% | 42.32% | 4.91
    text-2 ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • 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 …

    The difference is that ZX7 is a general pourpose packer and Laser Compact is a specific pourpose packer. So if you want to compress only screens (like Laser Compact) you may apply some filters before compression (and after decompression).

    The ...
    antoniovillena antoniovillena January 2013 Brand new software
  • 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 …

    ... with the XOR: the bits lost in the matches are ... other way and gain some bits, for example:
    [CODE ... br /> 010-100: 96 bytes (32*3) window offset
    ... stream. The first 3 bits are to offset type selection ... , if 001 read more bits from the bit stream. ...
    antoniovillena antoniovillena January 2013 Brand new software
  • 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 …

    ... ;674383]So read 8 bits from the byte stream. ... The first 3 bits are to offset type ... byte stream only. These bits will distinguish if you should ... read another 5 bits (offset value < 3*32+2, except ... 00 or 1f), or read another 9 bits (3*32 ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... you mean the number of bits necessary to encode an offset ... you have 2 lines (length 32) that only differs 1 byte ...
    antoniovillena antoniovillena January 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... have 2 lines (length 32) that only differs 1 ... calculates the number of bits required to encode a ... using the minimum number of bits. At this position, ... this minimum number of bits (for instance you may ... the minimum number of bits for this position, instead ...
    Einar Saukas Einar Saukas January 2013 Development
  • maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …

    ... address. The Z80 provides 7 bits of that, for 256 / 512 ... . Clocked with /RFSH signal, counter bits 8 and 9 used as ... additional refresh address bits (intuition might say bits 7 and 8 ... ]easy[/I] to program for, 32 KB blocks are too large ...
    RetroTechie RetroTechie February 2013 Hardware
  • Keyboard TrickI know how to use the multi key in BASIC with IN you can get the keys [QUOTE]IN 254+256*(255-2^K)[/QUOTE] K is the keyboard's half row, comes from …

    ... : LD E, 5 ; Loop 5 bits per half-row
    IN ... ,56,1,52,35,29,32,246,120,7,71,21 ... ,32,236,193,201
    (2nd ...
    BloodBaz BloodBaz February 2013 Sinclair Basic
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... . we're in the low 32 KiB of address space) and ... port, with the drive selection bits in D0?D3 (with D0 ... understanding them (or at least bits of them). How did this ...
    zub zub March 2013 Hardware
  • A quick newbish questionI'm reading through 'mastering machine code on your spectrum',as kindly posted by Mr bert on this forum. Correct me if I'm wrong from what i read,bu…

    ... ,E hold one byte (8 bits),which for hex is two ... wouldn't it,and not 32 bit ? (HL and De together ... Hl,DE wouldn't be 32 bit.

    What i ...
    The_Bert The_Bert March 2013 Development
  • How do I detect if key 'H' is pressed in machine code?How do I detect that the key has been pressed? I have been using the IN 239 command for keys 6-0, but dont know how to detech 'H'...

    ... (the code starts at 32500). Bits 0 to 4 return 1 ... /> 7A LD A, D
    32 A8 61 LD (61A8), A ...
    LuMan LuMan April 2013 Development
  • Buzzer sounds tips'n'tricksSo I have an ARM Cortex M3 with a buzzer connected to its GPIO pin. And because I read this forum I know that there is no need to add a separate buzz…

    ... the much faster 16- and 32-bit processors of the time ... ADPCM-compressed sound with 6 bits of resolution (on the beeper ...
    introspec introspec May 2013 Development
  • pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…

    [QUOTE=Patrik Rak;700143][QUOTE=Einar Saukas;700130]The problem is, you are applying asymptotic analysis to a limited size problem (i.e levels limited to size 24x32). Therefore the value of these constants make all the difference.[/QUOTE]

    Not ...
    Einar Saukas Einar Saukas May 2013 Development
  • Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…

    ... from the 8 and 16 bits. 32 bit processors evolved features that ... an exercise in learning about bits I don't normally deal ...
    Alcoholics Anonymous Alcoholics Anonymous June 2013 Development
  • Trigonometric find angleHi guys, anyone knows a formula to calculate an angle between two coordinates, using basic?s function ATN , recent programming tools have ATAN2(dy,dx…

    ... .12 (4 bits of integral value [20 if using 32 bit integer ... fixed point] and 12 bits of fractional ...
    Paradigm Shifter Paradigm Shifter July 2013 Development
  • The right toolsAs i am going to pick up a hobby of fixing spectrums I wanted to know whats the right tools for the job. Like what wattage should the soldering iron …

    ... Weller stations with different temperature bits, mine is not adjustable. The ... all the TTL and the 32/64k chips.

    As ...
    Pierre Pierre July 2013 Hardware
  • generating a pre-defined list in an un-defined sequenceI've decided to become a drunkard, to which end I've been drinking a whole bottle of beer in one day (whereas normally I'd make it last 2 or 3 days).…

    ... the same as shifting 16 bits to the right, so I ... all I needed was a 32-bit multiplication routine giving a ...
    Battle Bunny Battle Bunny July 2013 Sinclair Basic
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    AndyC on 6:29PM
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    Renegade on April 21
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