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  • Custom Spectrum ROMS with modified system fonts?Some of the more memory efficient adventures used the default Spectrum font in order to save bytes for the adventure itself. Level 9 in particular ju…

    ... font in order to save bytes for the adventure itself. Level ... POKE 23606 and 23607 with 256 less than needed!
    Dr BEEP Dr BEEP August 2012 Sinclair Miscellaneous
  • WibbleBibble's Basic threadHi in an attempt to keep my questions from spamming the forum. I think its better to put them all in one place. Thanks everyone so far, I feel I am …

    ... FN p(a)=PEEK a+256*PEEK (a+1)
    1000 ... "line 3000 is ";d3z-d3a;" bytes"
    1001 RESTORE 4000: LET ... "line 4000 is ";d4z-d4a;" bytes"
    1002 STOP
    3000 ...
    Battle Bunny Battle Bunny September 2012 Sinclair Basic
  • How much memory on sprites, maps etc.I've been tinkering with shifting & pre-shifting sprites recently, but as I haven't had that much experience with Z80 assembly I sometimes find it ha…

    ... which is 160 tiles.
    256 different tiles is usually more ... one byte. That gives 160 bytes, which isn't optimal but ... usually took me about 50 bytes.
    Ralf Ralf September 2012 Development
  • How much memory on sprites, maps etc.I've been tinkering with shifting & pre-shifting sprites recently, but as I haven't had that much experience with Z80 assembly I sometimes find it ha…

    ... you're going to use 256 of them - you can keep ... bits per tile, plus 16 bytes to say which 16 tiles ...
    joefish joefish September 2012 Development
  • Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…

    ... Spectrum Manual.
    Some instruction bytes, like 201 for 'ret', ... /> Some instruction bytes need one or two bytes of data afterwards ... do.
    Some instruction bytes need a further instruction byte ... ROM where the are 256 random looking bytes and add the ...
    buzzy buzzy September 2012 Development
  • Query about memorySo I know this has been asked a lot and I beg your brief indulgence. I have scanned through a lot of old threads already but I'm trying to improve m…

    ... reads one of the two bytes that the ROM OS uses ... would (should) mean 128 x 256 + 255 = 33023 which is 80FF ... machine...
    Or 128 x 256 + 0 = 32768 which is 8000 ...
    1024MAK 1024MAK October 2012 Hardware
  • Converting UDG to 2x2I've got a udg that I want to display in different sizes. Obviously I just print it for normal size, I can use the udg in bin format to display it ea…

    ... have to swap around the bytes, as it seemed that working ... p1=INT(b1/256): LET b1=b1-p1*256
    43 LET ... p2=INT(b2/256): LET b2=b2-p2*256
    45 PRINT ...
    ub880d ub880d October 2012 Sinclair Basic
  • UDG in AssemblyHello there my fellow WoS'ers I am currently having a play with z88dk and PASMO and would like to have some fun with some UDG's so is there a tutor…

    ... a,11111000b
    ld (16384+256),a

    ld a ... /> It just sets up 8 bytes and writes them to screen ... d ;next byte of screen, +256
    djnz loop ;repeat 8 ...
    joefish joefish October 2012 Development
  • Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …

    ... />
    1 - Speed optimized, 185 bytes:

    [code]
    ; ... ap_getgamma ;use a gamma code * 256 for offset, another gamma code ... code?
    ;bc=bc*256+(hl), lazy 16bit way
    256 for offset, another gamma code ...
    Metalbrain Metalbrain 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…

    ... a, a
    ret
    +256*27=6912


    At the cost of 2 bytes: 3,5% speed!
    Dr BEEP Dr BEEP 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…

    ... ]
    ; Note: exo_mapbasebits must be 256 byte aligned
    ; exomizer raw ... , 1
    defb 210 ;3 bytes nop (JP NC)
    exo_setbit ...
    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…

    ... ]
    ; Note: exo_mapbasebits must be 256 byte aligned
    ; exomizer raw ... , 1
    defb 210 ;3 bytes nop (JP NC)
    exo_setbit ...
    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…

    ... exo_mbb equ e_mbb+256
    exo_mapbb equ exo_mbb/256
    ; ... exo_mapbb)
    exo_mapbasebits equ exo_mapbb*256
    [/code]result
    256 is equivalent because, as ... the table is larger (565 bytes).

    ...
    antoniovillena antoniovillena November 2012 Development
  • Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …

    ... for aPLib fast depacker, 197 bytes:

    [code]
    ; aPPack ... ap_getgamma ;use a gamma code * 256 for offset, another gamma code ... this code?
    ;bc=bc*256+(hl), lazy 16bit way
    Metalbrain Metalbrain November 2012 Development
  • Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …

    ... +256*PEEK 23632+5),111
    Each CHANS entry is 5 bytes ...
    Battle Bunny Battle Bunny November 2012 Development
  • CAT!RAM and PUTRAMLast year sometime I posted a couple of routines to: * catalogue the 128k RAMdisk in BASIC; * move RAMTOP and the stacks from BASIC. CAT!RAM and PUTR…

    ... FN p(a)=PEEK a+256*PEEK (a+1)
    9900 ... storage details ((2+1)*3 bytes lo,mid,hi)
    REM ... array, 2=string array, 3=bytes
    REM 2,3 file ...
    Battle Bunny Battle Bunny December 2012 Sinclair Basic
  • 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…

    ... :

    Missed code: 4088 bytes out of 9556
    Non ... -code misidentified as code: 6013 bytes

    The missed code ... char *filename)
    int mapstart = 256*savemsb/8;

    // Save ...
    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 …

    ... 2 decrunchers, one of 68 bytes (option disabled) and other of ... 64 bytes (option enabled). Also you can ...
    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 …

    ... (length and offset limited to 256 and perhaps "interlaced Elias Gamma ... the length limit to 255 bytes.

    This is the ... 59 bytes decruncher:
    [CODE]
    dzx7 ... /> -put the limit to 255 bytes.
    -Substract a bit in ...
    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 …

    ... the length limit to 255 bytes.[/QUOTE]

    I' ... proper version will require 60 bytes (although untested):

    [ ... where limiting maximum length to 256 makes more sense), I ... maximum 256. In this case, the decompressor will have 44 bytes only ...
    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 …

    [QUOTE=antoniovillena;672786]73 bytes[/QUOTE]

    I started ... 's my version, also 73 bytes long but runs a little ... fourth bit was zero, add 256 to DE
    offset_end:
    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 …

    72 bytes version based in your faster ... fourth bit was zero, add 256 to DE
    offset_end:
    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 …

    Untested... 71 bytes?

    [code]
    dzx7:< ... fourth bit was zero, add 256 to DE
    offset_end:
    Metalbrain Metalbrain 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 …

    [QUOTE=Metalbrain;672992]Untested... 71 bytes?[/QUOTE]

    Great!
    < ... fourth bit was zero, add 256 to DE
    offset_end:
    bytes now! I will test it ...
    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 …

    [QUOTE=Metalbrain;672992]Untested... 71 bytes?[/QUOTE]

    Very good.< ... case, limiting max length to 256 (as Antonio suggested) is clearly ... , limiting max offset to fixed 256 or 512, etc) I better ...
    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 …

    ... End marker value >= 256 is represented as "0x0x0x0x0x0x0x0x1", ... The decompressor would have 44 bytes, including this:
    ... End marker value >= 256 is represented as "000000001xxxxxxxx", ... End marker value >= 256 is represented as "000000001xxxxxxxx", ...
    Einar Saukas Einar Saukas January 2013 Brand new software
<1…25262728293031…34>

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