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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 …
...
; copy previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
ex de, hl
sbc hl, de ; HL = destination - offset - 1 ... -
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 …
... speed improvement by changing ex (sp), hl with ex de,hl. Another thing, your "SLS ... -
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 previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
push hl ; store destination
sbc hl, de ; HL = 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 previous sequence
ex (sp), hl ; store source, restore destination
push hl
ex de, hl
call convert
ex de, hl
... -
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…
... hl, $f871
add hl, de
ex de, hl
pop hl
ofdone: ex (sp), hl ... -
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,
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 …
...
UM10 INC HL
ADD HL,DE
LD ... /> JR NZ,UM8
EX (SP),HL ; if all these 5 bits ... input
DEC HL
LD A,(HL)
EX (SP),HL
OR ... A
JR NZ,UM10
POP HL ...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…
... "ld hl,n; add hl,sp; ld e,(hl); inc hl; ld d,(hl)" kind ... e,(hl); inc hl; ld d,(hl); inc hl; ; ld e,(hl); inc hl, etc ... bc
pop de
ex (sp),hl
asm_strnchr:
... match:
dec hl ; cpi stepped hl one past last char ...Full 16*16-digit BASIC multiplicationI liked Andre Adrian's 32-bit long multiplication routine so much that I decided to a decimal version. After all, 2^63 is only 9223372036854775808, a…
... inc sp
inc sp
pop hl ;HL=$000D
ex (sp),hl ;HL=$106E ...
push hl
Confounded DEF FNCan anyone see why this is going wrong? I've been tinkering with it since tea time and got nowhere. [code] 2 DEF FN t$(n,t,d) =STR$ INT (n/t)…
... inc sp
inc sp
pop hl ;HL=$000D
ex (sp),hl ;HL=$106E ...
push hl
Bug in Super Wonder Boy in Monsterland?Hello!:smile: This game seems to have a bug that prevents finalize. The dragon that is in the last level, it is impossible to kill.Remains static.No…
... , stack use, I even saw EX (SP),HL for the first time in ...Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …
... bc
pop de
ex (sp),hl
asm_utoa:
hl,(_score)
push hl
ld hl,buffer
push hl
ld hl ... hl,(_score)
call utoa
pop ix
ld sp ...LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…
... /> ;;
;; Leaves HL pointing one byte past compressed ... br /> ex (sp),hl ; switch destination pointer into HL
push hl ; ... ; copy bytes
pop hl ; restore source pointer
...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ; end marker
ex de, hl ; start pointer to HL
pop de ... line
ld hl, (prog) ; avoid corruption
ex (sp), hl ; stack prog
push bc ; stack length
ex af ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... to DE
ex de, hl ; number to HL
ex (sp), hl ; number to stack ... , pointer to second to HL ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... br /> s_opertr:
ld hl, tbl_of_ops ; table address
... /> ld c, (hl) ; get code
ld hl, tbl_priors - 195 ; ... stack present values
ld hl, flags ; address flags
... flags
set 6, (hl) ; assume numeric
bit ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... br /> ex (sp), hl ; counter to HL, stack variable pointer
ex de, hl ; ... br /> pop hl ; unstack pointer
ex (sp), hl ; length to HL
... l_length:
ex (sp), hl ; new length to stack
ex de, hl ; start ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> exx ; store subroutine
ex (sp), hl ; return address
exx ; ... ; main register set
ex (sp), hl ; swap result and next literal ... ldir ; copy literals
ex (sp), hl ; restore result and next literal ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> or h ; string null?
ex (sp), hl ;
ld a, b ; ... ; reduce
inc hl ; lengths
ex (sp), hl ; and jump
... alternate register set
ex (sp), hl ; stack address in HL'
exx ; main ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... inc h ; increase it
ex (sp), hl ; swap with error address
dec sp ; three locations required
ex (sp), hl ; swap statement ... number and error address
ex de, hl ; ...
