-
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 …
... , $80
copy_byte_loop:
ldi ; copy literal byte
main_loop:
inc bc ; adjust length
push de
; determine offset[/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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop ...
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ...
; copy previous sequence
push de ; store ...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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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 …
... br /> [code]copy_byte_loop:
ldi ; copy literal byte
;;;;;;;;;;;;;;;;;;;;;
push hl ; store destination
sbc ...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 …
... ld de,$c000
push de
call dzx7< ... backwards)
next_row:
push de
call $0E9B ; ... ex de,hl
ldir ; copy attributes
ret
[/ ... ld de,rcs_buffer
push de
call dzx7< ...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…
So how do you use RCS in practice? It's quite simple:
[LIST]
[*]First transform a regular ZX-Spectrum screen file (such as "Cobra.scr") into the RCS format (producing "Cobra.scr.rcs") using the command-line utility RCS;
[*] ...RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…
...
ld e,l
push de
call $1820 ; initialise ... chunk of page 4 to copy in various routines, including its ... level loader, a copy of which resides in high ...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 …
... copy_byte_loop:
ldi ; copy literal byte
main_loop:< ... br />
; copy previous sequence
ex ... source, restore destination
push hl ; store destination
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…
... />
; Preserve initial address
push de
; First step ... 64 bytes: for each column, copy all bytes from screen ordered ... "r2r3p1p2p3r1" to this buffer, then copy them again to the screen ...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 …
... :
call copy_byte ; copy literal byte
main_loop:< ...
; copy previous sequence
ex ( ... source, restore destination
push hl ; store destination
...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…
... copy_byte_loop:
ldi ; copy literal byte
main_loop ... call rbits
push hl
ld ... restore destination
push hl ; store destination
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…
89 bytes (-1 byte):
C cruncher code:
[CODE]
#define MAX_OFFSET 2160 /* range 1..2160 */
...
void write_elias_gamma(int value) {
int bits= 0, rvalue= 0;
while ( value>1 )
++bits,
Anyone worked with HTML5 Canvas?Aint it awful? You cannot rotate (transform) a individual element but you have to rotate the whole canvas. That's akin to turning the room around to…
...
So first you 'push' or add the matrix to ... stored earlier
make a copy and store that for drawing ...Rally Driver Hi-Score Challenge!!!I was looking for a game to aid [URL="http://www.worldofspectrum.org/forums/showthread.php?t=43476"]MickMog's thread[/URL] and discovered this little…
... inlay too, anyone got a copy? I've found [URL="http ... 'don't buy this', if push came to shove I'd ...Z80 internal compressionThis isn't exactly a ZX Spectrum problem, but since WOS probably has some of the best Z80 coders in the world, I thought I might ask anyway. For my …
... JR NC,UM4 ; "1" means "copy an uncompressed byte"
LDD ... NC,UM6 ; be
PUSH BC
PUSH HL
LD L ... /> LD B,0
LDDR ; copy the string from the already ...
DEC HL
PUSH BC
PUSH HL
LD L ...The new xbox...I hope the launch of the new xbox (6pm BST today!!) blows the dismal PS4 launch into orbit!! I'm not sure if I'm getting excited or not. I still rem…
... who buy a second hand copy [I]may[/I] also decide ... pick up the DLC. My copy of [B]Fallout 3[/B ... the restrictions are intended to push more of the money to ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... all those PUSH instructions. It's not doing a copy.
When you copy data, you ... POP as many registers as you can, then PUSH ... about which registers you PUSH and in what order ... />
Also a PUSH takes 11 cycles, or 16 ...Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…
... instruction for a quick byte copy without the corruption or messing ... to remove a couple of PUSH/POPs just to get it ...SkoolKit 3.4SkoolKit - a suite of utilities for creating disassemblies of Spectrum games in HTML (and ASM) format - has reached version 3.4. Some of the new stuf…
... PUSH/POP would be useful to identify the stack area (or copy ...
