-
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 …
... />
DRAWSPR DI
PUSH IY ;Preserve IY for return ... RETURN1 LD SP,(SPSTORE)
POP IY
EI
RET ... /> LD SP,HL
POP IX
POP IY
... RETURN2 LD SP,(SPSTORE)
POP IY
EI
... -
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 …
... di
push hl
push de
push bc
push af
pop af
pop bc
pop de
pop hl
unscrambleHL:
push de
push bc
push af
< ... br />
pop af
pop bc
pop de
ret ... -
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] ; ***********…
...
PUSH AF
PUSH BC
PUSH HL
PUSH IX
POP HL
RET
DoBlankAttr:
PUSH HL
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] ; ***********…
... br /> PUSH AF
PUSH BC
PUSH HL
PUSH IX
POP BC
DJNZ ...
POP IX
POP HL
POP BC
POP AF
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…
... check against
CDLOOP PUSH BC
LD BC ... for next sprite
POP BC
DJNZ CDLOOP ;Loop ...
RET
COLLISION POP BC
LD A,MAXSPRITES ...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…
... check against
CDLOOP PUSH BC
LD BC ... for next sprite
POP BC
DJNZ CDLOOP ;Loop ...
RET
COLLISION POP BC
LD A,MAXSPRITES ...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 …
... />
[code]
rnd push hl
push de
ld hl ... 1 to N
pop de
pop hl
ret
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…
... as I think the commands PUSH and POP alter the SP by ...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…
... as I think the commands PUSH and POP alter the SP by ... SP by 1.
PUSH and POP do alter it by 2 ...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…
... as I think the commands PUSH and POP alter the SP by ...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 DE
PUSH ... /> POP BC
LD SP,HL
PUSH BC
PUSH DE
PUSH ...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 DE
PUSH ... /> POP BC
LD SP,HL
PUSH BC
PUSH DE
PUSH ...On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…
... ,8000
POP AF
POP BC
POP DE
POP HL
EXX
POP AF
POP BC
POP DE
POP HL ; using ... ,4010
PUSH HL
PUSH DE
PUSH BC
PUSH AF
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 DE
PUSH ... /> POP BC
LD SP,HL
PUSH BC
PUSH DE
PUSH ...the happiest days of your life-pt2hello,again i have come up with 2 solutions to the problem of solving this game:- 1.the more people that try to solve this game (by combining diffe…
... routine
#DB48 PUSH IX
#DB4A POP HL ; Preserve IX register ... ) ; 'A' contains #62
#DB6C PUSH BC ; Preserve location of incoming ...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…
... /> dec c
push bc
push hl
7741 ld ... 7750 djnz 41
pop hl
call EE
pop bc
exx
... djnz 5F
pop hl
call EE
Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…
... ]
ld hl, 4000h \ push hl \ pop de \ inc de \ ld (hl ...Zecut0r and ZAFA while ago (about 2 yrs)i took VbSpec and tried to port it to Delphi 6. Althought it was pretty weak, it. Meanwhile DelphiSpec 0.1 appeared and i wa…
Zecut0r and ZAFA while ago (about 2 yrs)i took VbSpec and tried to port it to Delphi 6. Althought it was pretty weak, it. Meanwhile DelphiSpec 0.1 appeared and i wa…
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…
... ) ----
push de
push hl
... />
done_draw_attr:
pop hl
pop de
; ... ),bc
pop af
ld hl, LastRotateTable ...
; -----
pop hl ; hl = last screen address ...Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…
Well it seems Woody is hottest. The ISR loads R with FFh.
[code]
ei
push af
ld a,ffh
ld r,a
pop af
reti
[/code]
DerekHow 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 …
... end of the line) then POP HL, do a RLC H ... , RLC L, POP DE, RLC D, RLC E ... , POP BC, RLC B, RLC C, ... you've scrolled 12 bytes, PUSH the whole lot back move ... again, POP HL, LD DE,0, ADC HL,DE, PUSH HL and ...Reading the keyboardDoes anyone have a code sample to read the keyboard in machine code ?
... /> PUSH HL
PUSH BC
CALLADDR CALL 0
POP ... BC
POP ...Key Redefine RoutineAnyone written a nice key redefine code snippet?
... ,(HL)
RET
COUNN PUSH BC
LD B,0 ... /> COU_E LD A,B
POP BC
RET
[/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…
... /> LD A,(DE)
NOTDIRTILE PUSH HL
LD (HL),A ...
LD (HL),A
POP HL
INC L
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…
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…
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…
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…
