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Loading the display with data from memoryTrying to load part of the screen(4k's worth) with data from memory location 53000, I've written this routine, but it doesnt work... [I]ld b,4000 ld…
...
[CODE]
1 ld sp,hl ; 6
pop ... br /> pop bc ; 10
ld sp,hl ; 6
push ... /> pop bc ; 10
ld sp,hl ; 6
push ... transfered 256*15 bytes. For the lastest 160 bytes you can't ... -
Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…
... :
[code]ld b,128
ld c,96
ld a,b ... /> or
[code]ld a,128
ld c,96
call ... instruction early to perform a LD B,A. Which version you ... is safer and saves 2 bytes from my code. -
Faster CLS...Hi Folks, Looking at the CLS command in the Spectrum ROM disassembly it seems rather complex. Does anyone know of a simpler/quicker routine that wi…
... different ways rangeing from 12 bytes to approx 5K...
[FONT=Consolas][FONT=Consolas]LD HL,$4000[/FONT]
[FONT ... =Consolas]LD BC,$1800[/FONT]
[FONT ... =Consolas]LD (HL),L[/FONT][/FONT]
Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…
... screens x 300 bytes per screen = 7200 bytes, + 2160 bytes for tile ... of repetitions
ld ixh,b
ld ixl,c ;Temporary ... djnz RLEPut1byte
ld b,ixh
ld c,ixl ;Update BC ...Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…
... screens x 300 bytes per screen = 7200 bytes, + 2160 bytes for tile ... of repetitions
ld ixh,b
ld ixl,c ;Temporary ... djnz RLEPut1byte
ld b,ixh
ld c,ixl ;Update BC ...Faster CLS...Hi Folks, Looking at the CLS command in the Spectrum ROM disassembly it seems rather complex. Does anyone know of a simpler/quicker routine that wi…
... stack pointer forward to the LD SP,0000 statement. So if ... is re-written to read LD SP,30000 for when you ... of having to reserve two bytes somewhere to store the stack ... the $31 command code for LD SP,...).Using the ROMs PRINT routineI really am starting from scratch again it seems, but how do you utilize the ROM routine to print characters, I think you point te BC register to an …
...
At around 60 bytes plus the string I find ... /> [CODE]org 33000
ld ix,string ;point ix at ... ret
;
pstring ld a,(ix+0) ;get ascii ... certain letters merging
ld (de),a ;put on ... ret
;
get_char ld h,0 ;arrive with a ...Willy Meets The BeatlesHere's the almost complete release of Willy Meets The Beatles, which you can download from [URL="http://www.sendspace.com/file/55ps31"]HERE![/URL] T…
... piece of code is 256 bytes in from the start of ... ,l7cc9
xor a
ld c,a
[/code]
Souce Code for Midnight ResistanceI just saw this on ebay and was wondering if this was the real deal. Does anyone know ? [url]http://www.ebay.co.uk/itm/Sinclair-ZX-Spectrum-Midnight…
... ' key, and the LD A,$BF and comparing ... /> RET NZ
LD A,$BF:IN A,(254 ... e2d1,$3e $e2d2 $7f for LD A,$7f
bytes correctly. However, pressing JB ... changed that NOP into LD A,$7f correctly but ...A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…
[QUOTE=Timmy;594378]Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how easy it actually is. (Actually I've already published this one some time ago, but this ...Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
...
ld hl, 32768
ld de, 49152
ld bc, 16384 ... /> A slighly simplified code (32 bytes, I think):
[code ... ), A
ld hl, 32768
ld de, 49152
ld bc, 16384 ...rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... rla
or l
ld l,a
[/CODE]
bytes and 72 T-states.
ld l,a
[/CODE]
Now it's 9 bytes ... /> [CODE]
ld a,h
ld b,4
loop ... [/CODE]
Now 8 bytes and 162 T-states.
rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... /> rla
or l
ld l,a
[/CODE]
It's now just 11 bytes and 72 T-states.
[CODE]
ld a,h ; make copy of ...rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... the end ;] :
[CODE]
ld a,h ; make copy of ... notice this version takes 13 bytes and 80 T-states. The ...rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... mistaken:
ld de,temp
ex hl ... ,de
ld (hl),d; (hl) = & ... amp;17
ld a,e; a = &28 ... &72
ld h,(hl)
ld l,a
< ... 70 T-states and 14 bytes (or 15 depending how ...rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... by using a 256 bytes table for reverse nibbles
ld b, h ;4
ld h, table ;7 ... /> and $0f ;7
ld b, a ;4
xor ... ;4
ld h, a ;4
ld a, b ; ...rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... a table with 256 bytes with a function that ...
[CODE]
ld h, table/256
ld b, 0
here inc l
ld a, l
rlca
rlca
rlca
ld (hl), a
djnz here ...rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... first nibble swap between bytes and second nibble ... xor h
ld h,a
and ... xor l
ld l,a
and ... rlca
ld h,a
ld a,l
Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... it cannot read the screen bytes.
My hypothesis ...
$9A7E
...
$9A8C LD B,$01
$9A8E CALL ... $9A91 CALL $C000
$9A94 LD B,$00
$9A96 CALL ... XOR A / LD I,A before the LD B,$01 and ... I to $FD after the LD B,$00 / CALL $8050 ...LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... 5 seconds and a few bytes by changing the out of ... /> inc de ;lookahead pointer
ld a,(de) ;compare lookahead character ... match
ld bc,(CPOS)
ld a,h
cp ...LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... />
[code]
;change 3 bytes lz|wx.fg| unpacked as ... |g0 to 4 bytes 0l|wx.0z|fg
LD A,d ... ;D=D6D5D4D3D2D1D0C7 carry=D7
; LD A,d ;A=D6D5D4D3D2D1D0C7LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... /> ; res 7,c ;removed
ld a,l
xor 1 ... /> ld l,a ;reverse offset adjustment
;change 3 bytes lz ... |g0 to 4 bytes 0l|wx.0z|fg
LD A,d ...LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... 7,c ;removed
ld a,l
xor 1 ... ld l,a ;reverse offset adjustment
;change 3 bytes lz ... .xf|g0 to 4 bytes 0l|wx.0z|fg< ... br /> RL c
LD A,c
RLA
LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... down in red. [T-States/Bytes]
RLD/RRD 7+18 ... = 97 T-States = 13 Bytes[CODE]LD A,[HL]
INC HL ... [COLOR="Red"]INC HL
LD C,[HL][/COLOR]
RRA ... States = 5+4*5 = 25 bytes
A little more speed ... are free to get rotate bytes. but can read upto 32 ...Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …
... /> [CODE]org 33000
cls ld b,8 ;8 bits to ... /> ret
;
clearscreennice
ld hl,16383 ;just before display ...
cloop inc hl
ld a,h
cp 88 ... going[/CODE]
20 bytes, I'm sure Dr Beep ...Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …
... to a mask of 8 bytes, each holding a bit ... to "draw"
LD IX, IX_TABLE
LD BC, 64 * 256 ... , seeded at 1
LD DE, 1
LOOP1: ... /> RL A
LD (MOD_INST+2), A ; Self modifying ... B = 64
LD H, A
LD A, (HL) ; Self ...BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…
... /> DI
LD HL,$5800
LD B,$03
... br /> DJNZ repintar
LD HL,$4000
otra_onda ... PUSH HL
LD B,$01
paso_1 ... JP NZ,otra_onda
LD H,$40
JP ... the additional data, 16 bytes for save, and 128 ...28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... 16x1 because the two attribute bytes in that pair don't ... it's enough for three ld rr,nn. Damn we need ...Is there a ROM modification (48K) for load without typing LOAD""?The target is to play with 48K machines with keyboard broken, or an alternative solution for new clones like Superfo instead of making a new keyboard…
...
LD BC,$0011 ; presume seventeen bytes for a header ... .
LD A,($5C74) ; fetch ... ; BC-SPACES creates 17/34 bytes in workspace.
...
