-
Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... /> ld bc, 16384
add hl, bc ; absolute address again
ld (label2addr(storePtr)), hl
jp label2addr(interruptEnd)< ... ld bc, 16384+4096
add hl, bc
ld (label2addr(storePtr ... code]
edited to add: at the end it should ... -
IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... D,0
LD HL,gfx
ADD HL,DE
ps01:
ps0:
ADD HL,DE
DJNZ ps0
HL now=FA0Ah
ADD A,(HL) ; Add the contents of HL to ... -
IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... for different gfx)
ADD HL,DE ; Add DE, so we now have ... /> LD E,A
ADD HL,DE ; And add that
HL now=FA0Ah
ADD A,(HL) ; Add the contents of HL to ... -
Anyone know the address mappings...of the hardware resources on the speccy; From the screen display address range to all the hardware control registers. etc. Where can I get access t…
...
CDETECT LD HL,64010 ;address of first sprite ... /> DEC C ;Will add BC & HL later to point to ... decrease this
;as HL has been increased.
< ... ;a collision
INCPOINTER ADD HL,BC ;no collision so move ... -
Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…
...
CDETECT LD HL,64010 ;address of first sprite ... /> DEC C ;Will add BC & HL later to point to ... decrease this
;as HL has been increased.
< ... ;a collision
INCPOINTER ADD HL,BC ;no collision so move ... -
I need ASM for random numberI need to generate a random pair of coardinates in asm so that x=random no between 0 and 31, y=random no between 0 and 23. Any ideas on how to code …
... 32768
LD HL, (23672)
LD (_RANDOM_SEED), HL ; Initialize the seed ...
LD HL, (_RANDOM_SEED)
LD A, H
ADD A, A ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... /> LD HL,(HL1)
ADD HL,DE
LD (HL1),HL
... ,16
LD HL,(HL2)
ADD HL,DE
LD ... /> LD HL,(HL1)
ADD HL,DE
LD (HL1),HL
... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... /> POP BC
LD SP,HL
PUSH BC
PUSH ... br /> ld de,16
add hl,de
EXX
ex ... br /> ld de,16
add hl,de
LD A ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... IMPORTANT LINE
ADD HL,DE
LD (HL1),HL
EXX
LD HL,(HL2)
ADD HL,DE
LD (HL2 ... ),HL
[/code]
... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... LD D,0
ADD HL,DE ; Add onto GFX
EX ... br /> LD DE,16
ADD HL,DE
EXX
LD ... br /> LD DE,16
ADD HL,DE
EXX
LD ... -
I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... /> [code]LD A,238
ADD A,1
[/code]
add 20 to a 16 bit ... how[/I] you add to it.
ADD HL,DE for example ... , will affect the carry flag. However INC HL ... even if the value of HL wraps from $FFFF to $ ... -
I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... upon how you add to it.
ADD HL,DE for example ... , will affect the carry flag. However INC HL ... , even if the value of HL wraps from $FFFF to $0 ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... LD D,0
ADD HL,DE ; Add onto GFX
... LD DE,16
ADD HL,DE
LD (hl3 ... LD DE,16
ADD HL,DE
LD (hl3a ... LD DE,16
ADD HL,DE
LD (hl4a ... -
Fast division in machine codeHi Does anyone know what is the fastest way to divide a 16 bit number by 24 in machine code. Derek [ This Message was edited by: dmsmith on 2004-0…
... , GOC wrote:
equal to, HL. There is some overhead, but ... :
[code]
enter: HL = number < 3072
exit ... : bits 12..5 of HL = int part of num/24 ... d
rr e
add hl,de
ret
Fast division in machine codeHi Does anyone know what is the fastest way to divide a 16 bit number by 24 in machine code. Derek [ This Message was edited by: dmsmith on 2004-0…
... ,div3table
ADD HL,DE
LD E,(HL)
INC HL ; or just ... even byte...
LD D,(HL) ; result is now in DE ...Can Anyone explain sprites in Jet Pac/Atic Atac etcJet Pac was 16k, and yet the sprites were impressively fast. I notice they had a slight flicker at times, but were notmally pretty flicker free. W…
... />
Left4: add hl,hl
adc a,a
Left3: add hl,hl
adc ... a,a
Left2: add hl,hl
adc ... a,a
Left1: add hl,hl
adc ...Reading the keyboardDoes anyone have a code sample to read the keyboard in machine code ?
... key pressed
ld hl,SPkeytranstbl
add hl,de
... br /> ld e,40
add hl,de
.nocaps ... br /> ld e,80
add hl,de
.nosym ...
ld a,(hl) ; a = ascii code
scf ...Key Redefine RoutineAnyone written a nice key redefine code snippet?
... E
SLA E
ADD A,E
LD E ... D,0
LD HL,5
ADD HL,DE
LD A ... ,(HL)
RET
COUNN PUSH ...Announce Pasmo 0.5.1Hello. New release 0.5.1 of Pasmo, multiplatform Z80 cross-assmbler. The main news are related to macros: the MACRO parameters now are expanded ins…
... I reliaze that to add such support would be tricky ...
if c
add hl, bc
rla
else ...
ld hl, ($8765)
or (hl)
endif
...
jp nc, _uniqLabel_72ndg1
add hl, bc
rla
jp ...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…
... /> LD DE,32 ;+ 10
ADD HL,DE ;+ 15
POP DE ... ,32 ;+ 7
ADD A,L ;+ 4 Add 32 to Low part ...
ADC A,H ;+ 4 Add carry out to High part ...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…
... L
PUSH HL
LD (HL),A
EX ... AF,AF'
LD A,31
ADD ... /> LD DE,32
ADD HL,DE
...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…
...
PUSH HL
LD (HL),A
... EX AF,AF'
LD A,31
ADD ... /> LD DE,32
ADD HL,DE
...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…
...
PUSH HL
LD (HL),A
... EX AF,AF'
LD A,31
ADD ... /> LD DE,32
ADD HL,DE
...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…
...
PUSH HL
LD (HL),A
... EX AF,AF'
LD A,31
ADD ... /> LD DE,32
ADD HL,DE
...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…
... ORG 50000
LD HL,22528
LD IX,MAP ... ,L ; in fact Add 32
LD (HL),A
DEC ...
LD DE,32
ADD HL,DE
DEC C ...How do I convert score to 00000 formatWhat is the quickest and best way in machine code to display the score formatted in zeros. For example, My score is currently 320, so I want it to …
... ld a,"0"
add a,l
ld ... getdig1: inc a
add hl,bc
jr c, ... getdig1
sbc hl,bc
ld (de ...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. …
... />
ld hl, 32 ;10
add hl, sp ;11 next ... />
ld sp, hl ;6
... ld a, 32
add a, l
ld ... a, l ;4
add a, 32 ;7
... />
ld hl, 32 ;10
add hl, sp ;11 next ...JSW - Is this possible?There's an object in the Conservatory Roof which I reckon cannot be collected without losing a life. There's a snapshot taken in the Conservatory …
... /> ADD HL,HL ; HL = 2*(256*20 + L)
ADD HL,HL ; HL = 4*(256*20 + L)
ADD HL,HL ; HL ... ,0 replaces the middle ADD HL,HL with NOP, so HL only gets doubled ...
