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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 maximum offset 2^8=256 and maximum length 2^8 ... =256 (i.e. ZX1 format), and ... will typically save a couple bytes only, it's not worth ... -
Configuration of FPGA coresHi all! Lately a lot of features have been added to the V6Z80p Spectrum core. Most of them are handled (clearly) using ports. Some examples: ULA+, Ti…
... to 128 of the available 256 ports.
A complete clone ... hence should decode the high bytes fully. It is proposed that ... -
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 …
... /> 4. Turboloader code, 209 bytes
5. Loading screen turbodata ... (6912 bytes)
6. Game turbodata (22331 ... x-INT(x/256)*256: POKE 65532, INT(x/256)
1010 ... y-INT(y/256)*256: POKE 65534, INT(y/256)
1020 ... -
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 …
... 'll need to add 6 bytes to the start of the ... +2,INT (x/256): POKE zx7+1,x-256*PEEK zx7+2 ... +5,INT (y/256): POKE zx7+4,y-256*PEEK zx7+5 ... poke from basic. Now 89 bytes.
[url]https://dl.dropbox ... -
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,INT (x/256): POKE zx7+1,x-256*PEEK [B]([/B ... +5,INT (y/256): POKE zx7+4,y-256*PEEK [B]([/B ... reduced from 89 to 81 bytes the relocatable code:
[CODE ... -
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,INT (x/256): POKE zx7+1,x-256*PEEK (zx7+2 ... +5,INT (y/256): POKE zx7+4,y-256*PEEK (zx7+5 ... the resulting code at 81 bytes length. Tried the new decompressor ... -
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…
... using a 0x800 buffer (2048 bytes):
For each "third ... 8 bits
100 xxxxxxxx 256 11 bits
101-111 ... -
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…
... br /> Using the 83 bytes variant, you can change ... , improved by Antonio Villena (83 bytes)
; -----------------------------------------------------------------------------
... /> drcs:
ld de, 256*(FIRST_THIRD*8+64)
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…
... s the result (67 bytes):
[CODE]; ... decoder by Einar Saukas (67 bytes)
; -----------------------------------------------------------------------------
ld de, 256*(FIRST_THIRD*8+64)
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…
... in-place RCS decoding (60 bytes):
[CODE]; ... decoder by Einar Saukas (60 bytes)
; -----------------------------------------------------------------------------
ld de, 256*(FIRST_THIRD*8+64)
...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…
59 bytes:
[CODE]
; Decode starting ... /> ret m
ld de, 256*(FIRST_THIRD*8+64)-1
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…
[QUOTE=antoniovillena;676959]59 bytes:[/QUOTE]
OK, I ... :
[CODE] ld de, 256*(FIRST_THIRD*8+64)-1
[CODE] ld de, 256*(FIRST_THIRD*8+64)
[/CODE ...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…
... -place RCS decoder in 58 bytes:
[CODE]; ... Saukas & Antonio Villena (58 bytes)
; -----------------------------------------------------------------------------
ld de, 256*(FIRST_THIRD*8+64)+1
Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…
... char tiles made up from 256 UDGs. They can all go ... . Even allowing a handful of bytes to assign scripts to tiles ...Checksum routine wantedI wish to make a program that verify integrity of a Multiface 1 ROM. It is possible to compare each byte of the ROM against a binary dump, but this i…
... 8192 and it has 8192 bytes:
[CODE] ld ... br /> jr nz,loop ; repeat 256 times
djnz loop ; ... repeat 32 * 256 = 8192 times
ret[/CODE ... jr nz,loop ; repeat 32 * 256 = 8192 times
ret[/CODE ...Checksum routine wantedI wish to make a program that verify integrity of a Multiface 1 ROM. It is possible to compare each byte of the ROM against a binary dump, but this i…
... with an accuracy of 255/256 = 99.6%.[/quote]
256.
However, if (say ... across a range of 8 bytes, it has only a 50 ...Checksum routine wantedI wish to make a program that verify integrity of a Multiface 1 ROM. It is possible to compare each byte of the ROM against a binary dump, but this i…
... with an accuracy of 255/256.
However, if (say ... across a range of 8 bytes, it has only a 50 ...Checksum routine wantedI wish to make a program that verify integrity of a Multiface 1 ROM. It is possible to compare each byte of the ROM against a binary dump, but this i…
... with an accuracy of 255/256.
However, if (say ... across a range of 8 bytes, it has only a 50 ...Bottom 4 lines of the screen fileI'm wanting to save the bottom 4 lines of the display memory (AT 20,0 to #0; AT 1,31) 23168 is the start of the attributes and its length will be 32…
... there with a STEP of 256 to get each of the ... to get the 128 attribute bytes. The nine address ranges are ... , and each row is $80 bytes, so it could be done ... just ASCII text then 896 bytes could be saved by just ...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 …
... it relocatable. Its now 141 bytes though...
[url]https://dl ... ="Red"]8[/COLOR],INT (x/256): POKE z+[COLOR="Red"]7 ... [/COLOR],x-256*PEEK (z+[COLOR="Red"]8 ... ,INT
(y/256): POKE z+11,y-256*PEEK (z+12 ...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 …
... could have a small 6 bytes "header" containing some kind ... 2,INT (x/256): POKE z+1,x-256*PEEK (z+2 ... 5,INT (y/256): POKE z+4,y-256*PEEK (z+5 ... need to add the 6 bytes "header" before each compressed ... it should now say "6 bytes generated". Finally load file "Cobra ...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 …
... . This program is only 30 bytes long and you can call ... later
LD BC, 254*256+254
LD D, 8 ... code then here are the bytes:
[code]33,31,192 ...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 …
... software) the device into 256 sectors of 512 bytes each. This meant ... disc as a series of 256 x 0.5KB sectors.
SAVE writing zeros after program?Hi there! I hope this is the right forum, but I didn't find any other more appropriate... I'm trying to recover some very old tapes with stuff I mad…
... line address, lo&hi bytes of address; it will eventually ... 1 FOR a=PEEK 23635+256*PEEK 23636 TO PEEK 23627 ... -1:
LET n=256*PEEK a+PEEK (a+1 ... LET l=PEEK (a+2)+256*PEEK (a+3):
... a-INT (a/256)*256;TAB 28;INT (a/256):
LET ...Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
[QUOTE=joefish;687774]8x256 bytes [...] the first byte of all 256 chars, then ... (especially if stored at a 256 boundary).Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... , if you prefer, store two bytes per character to give a ... times bigger (6Kb to store 256 characters), but this is probably ...Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... the character map and 25*256=6400 bytes for each UDG table ...Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... , after the first sequence of 256 addresses insert an extra address ... the character map and 26*256=6656 bytes for each UDG table ...Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... because this solution uses 2 bytes per screen position instead of ... *128*2=24576 bytes. Considering another 26*256=6656 bytes for a single ... set of 256 UDGs, there ...
