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AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…
...
LOGIC: ld hl,12
add hl,sp
ld sp,hl ;undo USR ... /> ld hl,OPCODES
add hl,bc
add hl,bc
ld de ... USR 40021+VAL "{,a"
33 PRINT "RR ";a,"= ";USR 40021 ... -
tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…
... /> LD HL, 18 ; 33 18 0
ADD HL, SP ; 57
LD SP, HL ; 249 ... -
BREAK from GOSUBHere's another one. Just in case you wanted to break out of multiple GOSUB levels with a single command, here's a routine to do it, tested on all mod…
... [code]
RETSUB: LD HL, 20 ; 33 20 0 ;Discard all but ... & (ERR_SP)
LD SP, HL ; 249 ;from m/c ... )
EX DE, HL ; 235
LD (23613), SP ; 237 ... -
Help pleeease "Proving Emulator OpCode flags are correct"So I had a cunning plan... I wanted to write a test harness for Emulators that could "prove" that all opcode flags were correct. I wanted something m…
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50 DATA 33,0,112,221,33,0,128,6,0 ... below:
LD HL,0x7000 //mcAddr, lAddr
LD IX,0x8000 //xAddr ... ,0 //aAddr
LD C,0 //fAddr
LD D,0 //dAddr ...
POP DE
LD (HL),D
LD (IX+0),E
Troublesome routine, help needed!Having problems with this routine, it basically fires a rocket up the screen, but refuses to detect collisions. I'm using attribute blocks for detect…
... /> call 5633
ld de,rktdat
ld bc,33
call 8252 ... /> LD L, A
ADD HL, HL
ADD HL, HL
ADD HL, HL
ADD HL, HL ...
ADD HL, HL
LD DE ...Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
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ld hl,48640
ld de,48641
ld (hl),191
ld bc,256 ... = y*32
ld hl,22528
add hl,bc ;hl = address of start ... /> ld hl,char_address
add hl,bc ;hl = row in table
ld e,(hl)
JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…
... other words
[code]
LD A,bytetocheck ; Has to be ... 2
LD L,A
LD HL,jumptable
JP (HL) ; read/peek ... the contents of HL and ... jumps to the memory location HL
Looking ...Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... i.e. opcodes C3 5B 33.
0xFFFD JP 0x335B ... is to write C3 5B 33 instructions to the address FFFD ... /> 0x11DC LD (HL),#0x02 ; mem. 0xffff is 2
0x11DE DEC HL ; HL=HL-1 ... 5cb2
0x1222 LD HL,(5CB2) ; FF57
0x1225 LD (HL),#0x3e ; write 3e ...Add with Carry ExampleHi, I have been really struggling to understand this simple example from Mastering Machine Code and I wonder if anyone can help? I have include…
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[code]LD DE,3385
LD HL,7BC7
LD A,L ;A ... = 7B
ADD A,E ;A = 7B + 33 ... = AE
LD L,A ;L = AE ... and carry flag set
LD H,A ;H = 4C ... because I thought with load HL etc, then the H ...Sort 2 byte words (x, y) on ypos, also question about swap (DE), (HL)Well that was a lot of debugging ;) But if you want a routine which takes an array of 16 byte words x, y and then sort them on y (ignoring x), I'm…
... ; 4
ld a, (de) ; 7
ld (hl), a ; 7
ex af, af' ; 4
ld ... ; 4
ld a, (de) ; 7
ld (hl), a ; 7
ex af, af' ; 4
ld ... pop af
pop hl
ld c, a
jr ...Who want to remake Double Dragon?Seeing as the Speccy version was crap (see my review: [url="http://www.gamestyle.net/retro.php?article=31"]http://www.gamestyle.net/retro.php?article…
... /> ld (restore), sp
ld sp, xxxx
pop hl
ld (nnnn), hl 6144 ... /2 times
pop hl ...
ld (nnnn-2), hl
...
pop hl
ld (nnnn-6142), hl ...Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…
... br /> ld hl,$f000
ld de,$f001
ld (hl),$f1
ld bc, ... 257-1
ldir
ld a ...
push de
push hl
...
xxxx Hz rate. The Z80 ...ZX81 ScrollingI'm tempted to have a go at a bit of ZX81 programming, using MCODER II, though I could really use a fast multi-directional scrolling routine. Does a…
... /> Full screen needs to lower 33 Bytes and add
32 ... />
[code]
LD HL,(VAR FOR ENDSCREEN)
LD DE,(VAR FOR ...
SBC HL,DE
LD B,H
LD C,L
ADD HL,DE
EX DE,HL
LDDR
LD (DE),#76 ...i want to start writing my own gamesi want to start writing my own games but have no idea how. is there any downloadable dummys guides or some software that teaches u how. the only expe…
... so i remember that LD HL,NN has opcode 33 , LD BC, NN has ...Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…
... :
The two INC HL after eachother can also
The POP HL always returns an even number ... after C reaches zero so HL must be preload with ... on 2005-02-08 13:33 ]
[/quote]
... INC H totally unnecessary. LD HL,22528 and 2 INC L ...The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…
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start ld c,254
nline ld hl,noret
print ... dec hl
inc bc ... it gives opportunities for the 33 bytes routine, which would look ...
jr nbyte
nline ld hl,table+4 ; call to NLINE ...T.I.M. - A New Interlace - Demo for DOWNLOADHere's something that's been in the works for quite a while ( mostly in my head ) and recently I've aquired assistance to help it come to fruition. …
... br /> exx
ld hl, 16384
exx
ld a, counter ;(number ... /> push de
push af ;33
ex af, af'
push af ;33
inc h ;4 HL' down in screen ... push de
push af ;33
ex af, af'
The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…
... in LD HL,#0014
start ld c,255
nline ld hl,table ... br /> start ld c,0
ld hl,table
jp (hl)
[/ ...
The routine is now 33 Bytes, but the BASIC-call ... +1 in BASIC.
Total : 33 Bytes (30 Bytes)
ANNOUNCE: BASin Release 12 ready for downloadWell, after a rather large break, BASin's latest incarnation is ready for public use. Probably. BASin is a Sinclair Spectrum development environme…
... 50000
LD HL,50100
LD DE,16384
LD BC,6912
50 DATA 50000,12,33,180,195,17,0,64 ...After roughly 22 years can you help?Hi, A long one this but here goes. Roughly 22 years ago (i was 14 if i remember right) i got a 48K speccy for christmas of my dad it was awesome an…
... /> On 2005-11-19 20:33, dwayne dibbly wrote:
...bunch ... 01 02 is same as LD HL,#0201
First number ... is value which goes to HL. LD is just abbrev. (mnemonic) for ...Key press to ASCII valueI need a bit of code that will give me an ASCII value when the key is pressed. I only really need a-z. I tried using the following code but it only s…
... ld d,0 ; de = index of key pressed
ld hl, ... KeyTransTables
add hl,de
ld a,$ ... C V
defb 33,51,36,38,39 ; ...Games that are impossible to complete due to bugs!I'm trying to compile a list of Speccy games that cannot be completed because of a bug (or simply bad programming)! Here's a few... [B]Frankie Goes …
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should read :- #db85: ld hl, #5a84
which makes ... nosh up)
Poke 56197,33.
Think the ending ...Not so BRIGHTOk, on the Spectrum I'm a crayon man so I don't know much about the coding. If I create a graphic in, say, SevenUp or TommyGun and the graphic is not…
... :
ld hl,22528
ld bc,768
loop: ld a,(hl)
set ... 6,a
ld (hl),a
inc hl
30 DATA 33,0,88,1,3,0 ..."chunky" gfxHas anyone some experience with coding "chunky" gfx routines ? (chunky is something like this [url]http://www.pouet.net/prod.php?which=13204[/url])
... whatever (depends on variant), where XXXX/YYYY are pixel intensities (usually ... /> ld (hl),00001111b
inc h
ld (hl),10101111b
inc h
ld (hl ...Where to start?Hi all, I wanna start coding something for the speccy. I have good experience at C/C++ and some other languages. I have coded asm on pc too, and ma…
... /> defb 33,21,15 ; load hl pair with starting coords.
ld (plx),hl ... into hl?
[/QUOTE]
33 is the opcode for "ld hl,nn ... entered as defb rather than "LD HL,xxx" because it's a ...
