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... s
LD D,A ; save rest
ADD 156 ; count 100 ...
LD (HL),C ; store 10's
ADD A,#3A ; compute 1 ... ; to 1's
LD (HL),A ; store 1's
RET ... -
Strange layout of Spectrum video memoryHello, does anyone have an idea why the Spectrum's video memory has such a strange layout? I understand that a resolution of 256x192 is an easy mean…
... HL,(23606)
LD DE,512
ADD HL,DE
EX DE,HL ... ; DE holds a printable char ...
LD HL,16384 ; ... B,8
LOOP LD (HL),A
INC DE
... -
Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …
...
ADD HL,BC
LD A,(HL) ; get pixelpointer
EX DE,HL ; get ... address
XOR (HL) ; reset pixel
LD (HL),A ; put back on ... -
Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …
... /> LD H,LINEPTRS/256
ADD A,(HL)
INC H
LD ... /> ADD A,E
LD E,A
LD A,(DE)
XOR (HL)
LD (HL),A
ADD A,E
LD E,A
use ... -
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... ADD A,A
ADD A,L
LD L,A
LD SP,HL ... /> LD HL,JUMPTAB2
ADD A,A
ADD A,A
ADD A,L
LD L,A
LD SP,HL ... H,SCRTAB/256
ADD A,(HL)
INC H< ... -
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 a, (hl)
xor 255
ld (hl), a
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] ; ***********…
... frames
LD B,A
ps0:
ADD HL,DE
DJNZ ... =FA0Ah
ADD A,(HL) ; Add the contents of HL to A
; So at ... -
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] ; ***********…
... =FA0Ah
ADD A,(HL) ; Add the contents of HL to A
; So at ... =FA0Ah
ADD A,(HL) ; Add the contents of HL to A
; So at ... -
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…
... /> DEC C ;Will add BC & HL later to point to ... ;as HL has been increased.
LD A,E ;A now equals ... C ;
LD A,D ;
SUB (HL) ;same as above ... is
;a collision
INCPOINTER ADD HL,BC ;no collision ... -
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…
... /> DEC C ;Will add BC & HL later to point to ... ;as HL has been increased.
LD A,E ;A now equals ... C ;
LD A,D ;
SUB (HL) ;same as above ... is
;a collision
INCPOINTER ADD HL,BC ;no collision ... -
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 …
... /> ADD HL,DE
LD (HL2),HL
LD A,(COUNT)
DEC A ... =FA0AH
ADD A,(HL) ; ADD THE CONTENTS OF HL TO A
; SO AT ... -
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 E,A
LD D,0
ADD HL,DE ; Add onto GFX ... =FA0AH
ADD A,(HL) ; ADD THE CONTENTS OF HL TO A
; SO AT ... -
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 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 $0 ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... /> LD E,A
LD D,0
ADD HL,DE ; Add onto GFX ... =FA0AH
ADD A,(HL) ; ADD THE CONTENTS OF HL TO A
; SO AT ... -
Can Anyone explain sprites in Jet Pac/Atic Atac etcJet Pac was 16k, and yet the sprites were impressively fast. I notice they had a slight flicker at times, but were notmally pretty flicker free. W…
... by inverse gfx
ld (hl), a ;put down
inc de ... XOR but OR
ld (hl), a
inc de
inc ... /> and h
add a, 8
ld h, a
ret
How can I scroll a line of text and wrap perfectlyI know this is easy for most of you but for some reason I am messing it up. In Assembly Language I want to do the following: I have 1 line of text …
... of the line) then POP HL, do a RLC H, RLC L ... again, POP HL, LD DE,0, ADC HL,DE, PUSH HL and you should ... okay.
Then have a look for any optimisations you ...Reading the keyboardDoes anyone have a code sample to read the keyboard in machine code ?
... br /> ld hl,SPkeytranstbl
add hl,de
ld a,$fe ; check ... 40
add hl,de
.nocaps
ld a,f ; ... 80
add hl,de
.nosym
ld a,(hl) ; a = ascii code ...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…
... /> ADD A,E
LD E,A
LD A,(DE)
NOTDIRTILE LD (HL),A ... HL
LD (HL),A
EX AF,AF'
LD A,31
ADD A ...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…
... HL
LD (HL),A
EX AF,AF'
LD A,31
ADD A ... ,L
LD L,A
EX AF,AF'
LD (HL),A ...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…
... HL
LD (HL),A
EX AF,AF'
LD A,31
ADD A ... ,L
LD L,A
EX AF,AF'
LD (HL),A ...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…
... HL
LD (HL),A
EX AF,AF'
LD A,31
ADD A ... ,L
LD L,A
EX AF,AF'
LD (HL),A ...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 A,(DE)
NOTDIRTILE LD (HL),A
INC ... HL),A
SET 5,L ; in fact Add 32
LD (HL),A< ... you added 32
LD (HL),A
LD L,E ; ...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 …
... />
score add a,(hl) ; add to this column.
ld (hl),a ; new value.
ld (hl),a
dec hl ; back one column.
add 50 to the score simply point HL at the ...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 …
... g: Add 50
ld hl,column10
ld a,5< ... score:
add a,(hl) ; add to this column.
ld (hl),a ; new value.
ld (hl),a
dec hl ; back one column.
How do I get a random numberHi, I need a simple routine to get a random number from 1 to 4. I don't need nothing very complex or that much random, it just have to produce diffe…
Random:
push hl
ld a,r
ld hl,RandSeed
add a,(hl)
rrc a
ld (hl),a
pop hl
ret
RandSeed:
defb 91How do I get a random numberHi, I need a simple routine to get a random number from 1 to 4. I don't need nothing very complex or that much random, it just have to produce diffe…
... hl,23672
add a,(hl)
ld hl,RandSeed
add a,(hl)
rrca
ld (hl),a ...
pop hl ...Hi-Score tableThe score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the ta…
... (HL),A
DEC HL
DEC DE
LD A,(DE)
LD (HL),A ... />
LD HL,4
ADD HL,DE
EX DE,HL
Hi-Score tableThe score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the ta…
... (HL),A
DEC HL
DEC DE
LD A,(DE)
LD (HL),A ... DE,HL
ADD HL,BC
EX DE,HL
LD HL,NEWSCORE
Hi-Score tableThe score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the ta…
... (HL),A
DEC HL
DEC DE
LD A,(DE)
LD (HL),A ... />
LD HL,4
ADD HL,DE
EX DE,HL
