-
Idiots Guide......To machine code, or assembler language...whatever the appropriate term is Basically at this stage I want to fiddle about and try and get used to…
... The standard C libraries are a combination of common system ... br />
ld hl,10
add hl,sp
ld sp ... loop:
ld a,(hl)
or a
ret z ; basic ... can increase productivity greatly. A C compiler is not possible ... -
Pac-Land: can be coloured?All versions of this game are full coloured, but not the Spectrum version. It has large sprites, but maybe the scroll is too fine to make a coloured …
... (HL),A ;original code
LD B,A
LD A,H
ADD A ... /> EX AF,AF'
LD (HL),A ;write attribute
EX AF ... />
LD A,B
LD B,0
ADD HL,BC
LD (HL),A ;write attribute
EX AF ... -
Help with File Compressor by Mladen PopovicHi, I'm trying to compress BombJack (MCM) and transfer it to a +3 disk (Yes I own the original game :) ). I'm unsure about the addresses to enter in…
... di
ld hl,$0000
add hl,sp ;HL=stack pointer
... /> ex de,hl
and a
sbc hl,de ;(RAMTOP)- ... /> ex de,hl
and a
sbc hl,de
... -
Help with File Compressor by Mladen PopovicHi, I'm trying to compress BombJack (MCM) and transfer it to a +3 disk (Yes I own the original game :) ). I'm unsure about the addresses to enter in…
... add a,a
jr nz,m2
ld a,(hl)
inc hl ... add a,a
jr nz,n6
ld a,(hl)
inc hl ... ex af,af'
add a,b
ld b ... b
add hl,de
ld c,a
... -
Help with File Compressor by Mladen PopovicHi, I'm trying to compress BombJack (MCM) and transfer it to a +3 disk (Yes I own the original game :) ). I'm unsure about the addresses to enter in…
... add a,a
jr nz,m2
ld a,(hl)
inc hl ... add a,a
jr nz,n6
ld a,(hl)
inc hl ... ex af,af'
add a,b
ld b ... b
add hl,de
ld c,a
... -
Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…
... if the other operand is a constant. In this case Metalbrain ... ; first
add hl, hl
IF data & second
add hl, de
IF data = 0
ld hl, 0
ELSE
ld ... -
How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... /> ld l,a
add hl,hl
add hl,hl
add hl,hl
add hl,de ;HL=start of graphic ... -
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... de,hl
ld hl,13616
add hl,de
ld a,(hl) ... ;get required attribute
ex de,hl ... de
pop hl
add hl,de ;starting column< ... -
Deterministic random number generatorI'm looking for a random number generator in assembly which, given a seed, the generated sequence is always the same. You change the seed, you get a …
... bit ints and always returning a positive result). You can ... (void)
;
; Generates a random number in the range ... /> ; uses : af, de, hl
ld hl,(__seed)
ld de ... /> ld h,a
ld a,d
srl a
xor ... -
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... ]
ld hl,$57ff
add hl,de
ld a,h
cp ... to stored attirbutes
add hl,de
ld a,(hl) ;get required attribute ... -
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... /> ld hl,$4000
ld a,$23 ;A =INC HL
ld (INCDEC),a
call LOOPGO1
dec hl ... -
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... :
ld hl,$57ff
add hl,de
ld a,h
cp ... /> ld a,8
add a,(hl) ;increment screen PAPER indirectly
ld (hl),a ;and ... -
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... a
and $e0
add a,l
ld l,a
ld a ...
add a,$58
ld h,a ; Attribute ... a
and $e0
add a,l
ld l,a
ld a ... br /> ld (hl),a
inc hl
djnz loop0 ... -
IX register wonderings...***noob alert*** I'm doing a lot of these in my program: ld a,(ix+n) cp 0 jp z I know you can do things like this: dec (ix+n) but can you test …
... a, (hl) ;read dx
inc hl
add a, (hl) ;dx + x
ld (hl), a ... ;store x
inc hl ... dx:
ld a, 2
x:
add a, 67
ld ... (x+1), a
[/CODE]< ... -
Is ESXDOS flexible enough to incorporate e.g. Spectranet commands?I was just discussing the idea with someone about the wish some people have to be able to combine interfaces such as DivIDE (Plus) / DivMMC EnJOY! wi…
... />
cpi ; hl++, bc--
ld a,(hl) ; a = next char to ... ; accept plus sign, do not add to buffer
... no compromises. I should add those numbers do include some ... -
Pac-Land: can be coloured?All versions of this game are full coloured, but not the Spectrum version. It has large sprites, but maybe the scroll is too fine to make a coloured …
... A,(HL)
AND 11000111b ;black paper
LD (HL),A
CPI ;INC HL ... HL),A ;original code
LD B,A
LD A,H
ADD A ... AF,AF'
LD (HL),A ;write attribute
... /> LD A,B
LD B,0
ADD HL,BC < ... -
Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
... /> ld (cred_adr_to+1),hl
ld a,#5f
ld ... br /> add hl,de
ld (cred_adr_2+1),hl
... /> LD A,L
ADD A,32
LD L,A
... ret C
LD A ... -
Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... TEXTPRINT
ld a,(ix+0) ;fetch a new character code ... a
ld h,0
add hl,hl ;HL=HL*8
add hl,hl
add hl,hl
add hl,bc ;HL ... br /> TPBLP
ld a,(hl) ;get it on the ... From there on, you can add per-tile color, change ... -
Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... ,a
ld h,0
add hl,hl ;HL=HL*8
add hl,hl
add hl,hl
add hl,hl
add hl,hl ;HL=HL ... -
Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... tile y)
call get_screen_location ; HL now contains screen position to ... byte from tile
ld (hl),a ; put on screen
inc ... (B = row, C = column)
add a,64 ; then CALL this routine ... br /> rrca
add a,c
ld l,a
ret
Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... tile y)
call get_screen_location ; HL now contains screen position to ... byte from tile
ld (hl),a ; put on screen
inc ... (B = row, C = column)
add a,64 ; then CALL this routine ... br /> rrca
add a,c
ld l,a
ret
Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... from tile
ld (hl),a ; put on screen
add a,64 ; then CALL this routine ... rrca
add a,c
ld l,a
ret ... ld bc,767
ld (hl),a
ldir
Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... a tile it always has the same colours then add ... ( instead of 8 bytes add an extra byte ) , ... read colour
ld (hl),a
inc de ; point ... br /> call get_screen_location ; HL now contains screen position ... ; read colour
ld (hl),a
; dont forget now ...that "listing variables during runtime" thingWell, I did eventually finish this, but with my meds playing up I don't have much time each day that I can spend at the computer, so it's taken rathe…
... feature from DumpVars which assigns a separate variables area for ... using (or not using) in a program, finding redundant names, ... br /> FOR a=1 TO 7: READ v$(a): NEXT a:
... br /> FOR a=2 TO 7: PRINT a;" = ";v$(a): NEXT a:
INPUT ...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... /> ld a,b
sra a
sra a
sra a
add a,88 ... -ordinates
call get_screen_attr ; returns HL containing attribute co-ordinates on ... of the tile
ld (hl),a ; stick it in the right ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... (HL),A
INC DE
INC HL
LD A,(DE)
LD (HL),A ...
INC DE
ADD HL ...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... y)
call get_screen_location ; HL now contains screen position to ... byte from tile
ld (hl),a ; put on screen
inc ... (B = row, C = column)
add a,64 ; then CALL this routine ... br /> rrca
add a,c
ld l,a
ret[/COLOR ...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... byte from tile
ld (hl),a ; put on screen
... /> call get_screen_location ; returns HL containing attribute co-ordinates on ... the tile
ld (hl),a ; stick it in the ... ld a,b
sra a
sra a
sra a
add a,88 ...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... byte from tile
ld (hl),a ; put on screen
inc ... of the tile
ld (hl),a ; stick it in the right ... /> ld a,b
sra a
sra a
sra a
add a,88 ... /> Also, notice the PUSH HL and POP HL. This saves the screen ...
