-
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 …
... LD A,(HL)
INC H
DRAWBEG2 ... D
LD (HL),A
INC H
LD A,H ... )
INC H
LD H,(HL)
... /> INC H
LD (HL),D
DEC H
... INC L
INC D ... -
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 …
... address again
ld a, h
and 8 ; check if ... /> inc hl
ld a, h
and 8 ; test if ... with lower 3 bits of h.
; It effectively "linearizes" the ...
sla a
ld d, a
ld a, l ...
and 31
or d
ld l, a
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] ; ***********…
... LD E,SPRITESIZE
LD D,0
ADD IX, ... ,(IX+3)
LD D,0
LD HL ... LD E,72
LD D,0
LD A,( ...
INC H ; Increase H, thus moving 256 bytes forward ...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] ; ***********…
... E,SPRITESIZE
LD D,0
ADD IX, ... Get Yoffset
LD D,0
LD HL,gfx ... ; Get offset into E, D is already 0
... br />
INC H ; Increase H, thus moving 256 bytes forward ...Hisoft Pascal & FilesThe last ver of Hisoft Pascal in the Archives is 1.7m but only the manual for 1.6 is available. In the 1.6 manual it states that FILEs are not implem…
... , if only to see how H Pascal handles the spectrum screen ... /Drive commands work with the +D.
so, send us ...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 …
... rand) ; fetch pointer
ld d,a ; save range
ld ... it in ROM
ld h,a
ld (rand), ... next pointer
loop sub d
jr nc,loop ; ... in range
adc a,d ; a holds 1 to ...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 …
... E,A
LD D,0
ADD HL ... br />
INC H ; INCREASE H, THUS MOVING 256 BYTES ... ADDRESS
; LD A,H
; RRA
... ; OR 78H
; LD H,A
; MERGE ...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 …
... , the screen should be VSYNC'd.
... E,A
LD D,0
ADD HL ... PUSH AF
INC H
EXX
EX ... br />
INC H ; INCREASE H, THUS MOVING 256 BYTES ...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 …
... E,A
LD D,0
ADD HL ... PUSH AF
INC H
EXX
... PUSH AF
INC H
EXX
... />
INC H ; INCREASE H, THUS MOVING 256 BYTES ...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…
... NC, #DC1E ;
#DB61 LD D, #D1
#DB63 SUB #21 ...
77 I.D. Card
78 Objet D'Art
79 ... The Chalk
87 G.H. Annual
88 The Saddlebag ... Stamp (Cycle Sheds)
G.H. Annual (Study 1) to get ...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…
... by 3.[code]
SRL H ; divide by 4 and strip ... as dividing by
SRL H ; 8 and multiplying by 2 ... an even byte...
LD D,(HL) ; result is now in ...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…
H is a suffix which usually indicates Base 16 notation.
HTH,
D.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…
... /> LD B,H
RET Z
LD B,D ; D 0 by ...
INC HL
LD D,(HL)
NBYTE LD A ... A,255
ADD A,D
JR C,PR
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…
...
ld a,d
rra
rra
and 7
or h
ld h,a
ld ... data.
ld d,(hl)
inc hl
ld d,(hl)
inc hl
ld a,d
ld d,e
ld e ...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 …
... POP HL, do a RLC H, RLC L, POP DE, RLC ... D, RLC E, POP BC, RLC ...Can someone help me remember the game titleHi all, I am a long-standing fan of Speccy, yet for many years now I've been looking for the title of one of the games I enjoyed very much. I am ho…
... .worldofspectrum.org/pub/sinclair/games/h/HighwayEncounter.tzx.zip"]ftp://ftp ... .worldofspectrum.org/pub/sinclair/games/h/HighwayEncounter.tzx.zip[/url]
D.Jeff Minter - But who was YOUR first coding hero?Im still massively a fan of anything Jeff does, despite the fact he usually picks likely to die platforms. I remember in 88 when I was first discove…
i just W-I-S-H he could, oh how I do, I`d tell him to suck my big hairy.. caugh... SHED :)Archive Bugreports 'NONSENSE IN BASIC, 2020', component #2. Could someone please confirm
... />
5006 DATA "h",5008
5008 DATA ... /> "t",4,22,"soda water","h",5012
5012 ... ,"soda water",
"i",0,"h",5016
5016 ... this program has been OCR'd, and badly at that. ... many to correct.
D.I'm getting sick and tired of EBAYYeah thoroughly sick and tired of people hiding behind misleading descriptions, ie " Spectrum mint and boxed " the reply when i said the box wasnt mi…
... for p&p&h for a single tape, expecting ... , whereas ?5 vs ?15 you'd have something to say ?
d pay for something.
Reading the keyboardDoes anyone have a code sample to read the keyboard in machine code ?
... keyboard
ld d,$fe ; d = max 1 keypress ... current key index
; h = index of last keypress< ... br /> ld e,h
ld d,0 ; de = ... ; ENTER, L, K, J, H
defb ' ',255,'.',',','*' ; ...Help required to calculate screen addressesDoes anyone have some code that calculates the screen address one pixel below the given address ? Is it best to use a lookup table ? Any examples of …
If you've got your current pixel address in HL, would inc h not do the job?
D.New Functions for Sinclair BasicA total of 52 new functions can be added to Sinclair BASIC; 26 numeric functions (A-Z) and 26 string functions (A$-Z$). Owing to the internal structu…
... :
[code]DEF FN H$(n)=CHR$ (INT (n/4096 ... ):
[code]DEF FN D$(n)=CHR$ (INT n+7 ... ]DEF FN H$(n)=FN D$(n/4096)+FN D$(FN V(n ... ,4096)/256)+FN D$(FN V(FN V(n ... ,4096),256)/16)+FN D$(FN V(FN V(FN ...Key Redefine RoutineAnyone written a nice key redefine code snippet?
... :
in: -
out: H - byte of the address of ... LD L,A
LD H,B
RET
... E,A
LD A,H
XOR 255
SUB D
SLA E
...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
...
001 - c
010 - d
011 - e
100 ... - h
101 - l
110 - ( ...music making programs is there any music making programs available for the spectrum?
... 48 routines (Agent X, Chase H.Q., Zanthrax) were never published ... more friendly peoples stays there :D )ANN: Tipshop updated Monday, 31 January 2005Monday 31 January 2005 A dose of Chickenpox meant I FINALLY had time to put this update online. And very good it is, too.. The update, not the Chicke…
... America ,
Cerius ,
Chase H.Q. 2: Special Criminal Investigations ... Making , N.O.M.A.D. ,
NARC , Nemesis: The Final ...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…
... /> DEC B
LD B,H
RET Z
LD B,H
RET
... />
noret ld b,d
ld d,(hl)
nbyte ld ...
noret ld b,d
ld d,(hl)
nbyte ld ...
noret ld b,d
ld d,(hl)
nbyte ld ...Anyone help re-factoring a tile functionI had some excellent feedback for re-factoring my function that displays the colour for my screen tiles. Can anyone offer some help to improve the fu…
... HL to INC H as the map ... E,A
INC D
LDI
... E,A
INC D
LDI
... E,A
INC D
LDI
...
