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Squishing code up nice and small then unsquashing it in assemblyI refer of course to data compression. I've done a search and there are lots of good compressors, but I can't seem to find one that works in assembl…
... based LZ with short offsets (256 or so) as looking for ... =Gedlion;721351]Export your 768 bytes from an emulator as a ... -
The making of R-Type on the speccy book, free downloadBob Pape, the guy who wrote R-Type on the speccy has made his book, "IT'S BEHIND YOU: the making of a computer game", available for free download: [u…
... UDGs (with two bytes per character if 256 characters weren't enough ... -
The making of R-Type on the speccy book, free downloadBob Pape, the guy who wrote R-Type on the speccy has made his book, "IT'S BEHIND YOU: the making of a computer game", available for free download: [u…
... basically means that you have 256 UDGs and can select which ... any of the 1,000 bytes of the screen (40 characters ... -
The making of R-Type on the speccy book, free downloadBob Pape, the guy who wrote R-Type on the speccy has made his book, "IT'S BEHIND YOU: the making of a computer game", available for free download: [u…
... basically means that you have 256 UDGs and can select which ... any of the 1,000 bytes of the screen (40 characters ... -
The making of R-Type on the speccy book, free downloadBob Pape, the guy who wrote R-Type on the speccy has made his book, "IT'S BEHIND YOU: the making of a computer game", available for free download: [u…
... bitmap mode (the first 40 bytes of the data are the ... /> Because hardware sprites take 64 bytes each (well, 63 to be ... normal use) that gets you 256 possible places in one 16K ... -
128 BASIC-compatible way of loading BASIC as code?On a 48K Speccy (or from 48 BASIC or USR 0 mode on a 128K machine), one can do a silly trick like this: [code];; load a 4000 byte BASIC program ld i…
... FN p(a)=PEEK a+256*PEEK (a+1)
inc de ;DE=bytes
push de
... ; test load with "RANDOMIZE bytes: CLS: PRINT USR 65390"
bytes
CALL $0556 ;LD-BYTES
... -
Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…
... for a total palette of 256 colours. Also they are in ... drop the colour you get 256 grey shades.
[quote ... ]
You only need 64 bytes of SRAM, so it's ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... uses RANDOMIZE USR (+PEEK 23635+256*PEEK 23636) although I'm ... using VAL. VAL"+PEEK 23635+256*PEEK 23636" works beautifully as ... for 1; each one two bytes rather than seven.
bytes needed to embed the offset ... -
Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …
... ; Enable write
PAG_SZ EQU 256
REL_AD EQU #5B00
DJNZ PAT_LP; Count bytes
CALL HX_BYT; Get parity ... -
display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... versions add up to 14 bytes and 53 T, so I ...
1012 LET hl=h*256+l: POKE hl,255
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... using VAL. VAL"+PEEK 23635+256*PEEK 23636" works beautifully as ... for 1; each one two bytes rather than seven.
bytes needed to embed the offset ...display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... so will fit in a 256 byte page. i.e. ... all the entries within a 256 byte page.
bytes in one 256-byte page and the ... low bytes in the ... />
But that allows 256 rows, which is wasteful. Although ...What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... br />
[CODE]THE 'LD-BYTES' SUBROUTINE
This subroutine is ... 0802).
0556 LD-BYTES INC D This resets the ... ,0580,LD-LEADER register until '256' pairs have
been ...What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... ROM):
[code]; THE 'LD-BYTES' SUBROUTINE
org 0x0556
inc h ; 256 pairs
jr nz, ld_leader ...Poke 23755 & 23756Entering the following few lines of BASIC: [IMG][URL=http://s1286.photobucket.com/user/rebelstarwac/media/Poke1_zpsc2845838.png.html][IMG]http://i12…
... ] 10 LET dc=PEEK 23635+256*PEEK 23636
20 LET ... df=PEEK 23627+256*PEEK 23628
30 LET ... nl=PEEK dc*256+PEEK (dc+1)
40 ... /> 50 LET ll=PEEK dc+256*PEEK (dc+1)
55 ...Type-in BASIC contest on Reddit.Not sure how WOS-legal it is to mention/link to other forums, but Reddit is having a contest on r/retrobattlestations, asking readers to type a speci…
... code amongst the five bytes (a possible 5*256^4 values I ...Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…
... efficient solution (same number of bytes but faster):
[CODE] LD ... /> DJNZ loop ; inner loop repeats 256 times
DEC C
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…
... ROUTINES ----------------------------------------------
; THE 'SA-BYTES' SUBROUTINE
org 0x04c2
; THE 'LD-BYTES' SUBROUTINE
org 0x0556
inc h ; 256 pairs
jr nz, ld_leader ...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…
...
sub p_save + 1 % 256 ; safe to ignore overflow warning ... ld (ix + 12), 0x38 ; 14336 bytes
.endif
.ifdef ROM1 ... br /> inc de ; add three bytes
inc de ; for ... /> inc bc ; add three bytes
inc bc ; for ...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…
... byte less
dec bc ; bytes equal
inc de ; reduce ... /> call fp_to_a ; abs (n) mod 256 to A
jr nz ...Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... as I was copying empty bytes.
But it was ... times as there are 16 256 byte pages in 4 kB ...Getting aquainted with the IF1bisToday, fifteen days after dispatch, the IF1bis arrived at my door. In perfect order. No customs, no TVA and no handling fee involved. The arrival of …
Getting aquainted with the Interface1bis. (6)
One item left on my checklist after today, as said my interests are just partial and specific. Of course I will the use the gamelauncher, the joystick, the speedloader (video demo) one day. But I ...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…
... DE
ldir ; wipe bytes
exx ; alternate register ... byte count
ldir ; copy bytes
ld (udg), de ; ... br /> ld hl, font - 256 ; offest to ASCII character zero ... 2
ld h, kstate/256 ; stream address
ld ...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…
... 0x0b1e
set_7: ; 6 bytes
call line_addr ; get ... ; address of font definition - 256
org 0x0b6a ...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…
... /> ldir ; write bytes
pop bc ... and a ; than 256?
jp nz ...SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
... the screen in 768 bytes. (Although at present ... It's 362 bytes including 64 bytes for the BLOCK/2 ... byte = base address adjustment = (256-offset)/256 = 0 or 1
... cp (hl) ;compare first bytes
pop de ;(will ...Map compressor based on ZX7Hi I have release a map compressor for "La Churrera" game engine, but can be adapted to any other game. Source code is here (Download TmxCompress.0.…
... commented:
96 bytes (+6 if DMAP_BITHALF=1)
desc3: ld a, 256 >> DMAP_BITSYMB
desc4 ... file (map is always 150 bytes)
ret z
... = 0 because lddr moves bc bytes
ex (sp), hl ; ...Map compressor based on ZX7Hi I have release a map compressor for "La Churrera" game engine, but can be adapted to any other game. Source code is here (Download TmxCompress.0.…
Updated -6 bytes
90 bytes
[CODE]
... bit
desc2: ld a, 256 >> DMAP_BITSYMB
... file (map is always 150 bytes)
ret z
... = 0 because lddr moves bc bytes
ex (sp), hl ; ...
