-
i want to start writing my own gamesi want to start writing my own games but have no idea how. is there any downloadable dummys guides or some software that teaches u how. the only expe…
... how to split words to bytes and bytes to bits.
the ... basic so i remember that LD HL,NN has opcode 33 ... , LD BC, NN has 1, RET ... -
whats your second favourite retro computerOk i'm going to assume that for most of us here the speccy is our favourite number 1 retro computer,its the best home computer in the world etc etc :…
... a z80:
ld sp,source
pop af ...
pop hl
ld sp,dest+16
push ... />
which copies 16 bytes and takes 12.25 cycles ... it could copy approximately 5714 bytes in a frame using ... able to copy about 2048 bytes, I'm guessing approx. ... -
help in byte mirroring.I need some help. What is the best way to mirror the byte? (for ex. 10010011 -> 11001001) I mean, if there is a simple way to do it (may be with OR, …
need a Table of 256 bytes stored on a 256byte boundary
on entry: a=byte to mirror
FlipByte:
ld h,TableAdress/256
ld l,a
ld a,(hl)
ret -
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. …
... just show it :)
ld sp,src
pop af ... de
pop hl
ld sp,dest+14
push ... />
175 T for 14 bytes = 12.5 T per byte ... -
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. …
... br /> [code]
get1 ld sp,0x8000
pop af ... /> pop hl
put1 ld sp,0x4010
push hl ...
;repeat x16
ld hl,get1+2 ; high byte ... of the 0x8000
ld de,put1 - get1
... figure if you shift 16 bytes at a time, using ... -
Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…
... ]
sample_pos_hi: ld de,0x1234
sample_pos_lo: ld hl,0x5678
ld bc,sample_skip ; ... />
ld l,h ; middle two bytes
ld h,e ; ... lookup table
volume_lookup_high: ld h,0x83 ; high byte ... -
Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…
... - my code assumes that the bytes of the sample are always ... volume%4)
msbtbl:
ld h,msbtbl ; msbtbl = volume/ ... to pitch
pitchfrac:
ld a,pitchfrac
remainder:
ld b,10
djnz $
simple z80 rom for test my emulatorHi there! Does anyone here have a very simple rom(in Z80 format) for testing my emulator. I need a very simple one that implements few opcodes and po…
... some code to copy some bytes to the screen, surely you ... ,000D
0003 LD DE,4000
0006 LD BC,1B00
VSYNC FunctionI have written a VSYNC function, so that I can clear the screen before redraw without flicker on the screen, I do this by peeking at the address 2367…
... create a table of 257 bytes
ld de,0xBE01 ; so ... any address 0xBEnn
ld (hl),0xBF ; will point ...
ld b,e
ld c,e ; ld bc,257 ... int_routine at 0xBFBF
ld (hl),0xC3 ; opcode for ... JP
ld hl,int_routine
ld (0xBFC0),hl
SpecEmu 2.1 betaFinally I think I've cracked all the gory contention details required by those trendy multicolour demos (48K/128K modes only, +3 contention can wait …
... memory so as all its bytes are located in the starting ... instruction LD IX,1234H is starting from 7FFE, so it occupies bytes ... all the docs, first two bytes should be fetched taking into ... memory contension, but another two bytes are located in non-contendable ...+D/Disciple games archive?Hi all, Having finally got my disciple to work, I'm starting to have a look at hacking multiload games. Is there any archive on the web with games t…
...
cp 060h
ld a,(0719ch)
jr nz ... ,loadsome
ld (0600dh),a
scf
cp #60
ld a,(#719c)
jr nz ... , loadlvl
ld (#600d),a
scf
bytes option as does Warajevo) then ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
...
* If a LD A,I or LD A,R (which copy ... been confirmed) put random bytes onto the data bus at ... a table of 257 identical bytes at 256 * I and ... a table of 257 0xff bytes and place 0x18 (JR) ... However, hardware devices placing random bytes onto the data bus means ...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…
... to Sprite Data Table (10 bytes for each sprite)
*< ... /> CDETECT LD IX,50000
LD HL,CDFLAG
LD D,(IX ... br /> CDLOOP PUSH BC
LD (HL),0 ;Reset Collision Detection ... Flags
LD A,(IX+11) ;X coord ...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 …
... into 256 low bytes followed by 256 high bytes. This allows the ... ]
ld h,lineptrs / 256
ld l,d
ld c,(hl ... )
inc h
ld b,(hl)
[/code]
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 …
... any quicker than shifting the bytes in "real time", as ... table. for example:
ld hl,tablestart (may be #b000 ... )
ld a,(de) (taking from memory ... needed to shift)
ld l,a (so we have ... in hl #b050)
ld a,(hl) (table is precalculated ...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 …
... ,A
LD H,C0H ;table with preshifted mask bytes for left ... table with all bytes preshifted to all steps.
LD H,A ... a suitable part of preshifted bytes...
LD DE,(SPRADR) ;taking precalculated ...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 …
... ,A
LD H,C0H ;table with preshifted mask bytes for left ... table with all bytes preshifted to all steps.
LD H,A ... a suitable part of preshifted bytes...
LD DE,(SCRADR) ; taking precalculated ...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 …
... it advances fifty
; bytes a second.
storePtr .word ... br />
ld hl, (label2addr(storePtr))
ld a, (hl)
ld hl, 16384+4096
ld (label2addr(storePtr)), hl ... /> add hl, bc
ld (label2addr(storePtr)), 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] ; ***********…
... ,5800h
LD DE,5801h
LD BC,768
LD (HL),7 ... moving 256 bytes forward in memory to FB0Ah
LD H,(HL ... />
; Low Bytes of screen
ORG 0FA00h ...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] ; ***********…
... moving 256 bytes forward in memory to FB0Ah
LD H,(HL ... moving 256 bytes forward in memory to FB0Ah
LD H,(HL ... />
; Low Bytes of screen
ORG 0FA00h ...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…
... 64000.
10 bytes are alocated for each ...
next two bytes are X and Y ... br />
CDETECT LD HL,64010 ;address of first ...
LD BC,10 ;number of data bytes for each ... /> COLLISION POP BC
LD A,MAXSPRITES ;MAXSPRITES - B gives ...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…
... 64000.
10 bytes are alocated for each ...
next two bytes are X and Y ... ;collision
LD DE,(64001) ;X,Y coords ...
LD BC,10 ;number of data bytes for each ... /> COLLISION POP BC
LD A,MAXSPRITES ;MAXSPRITES - B gives ...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 …
... MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H,(HL ... />
; SCREENTABLE
; HI BYTES OF SCREEN
ORG 0FB00H ... ,0E0H
; LO BYTES OF SCREEN
ORG 0FC00H ...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 …
... br /> POP BC
LD SP,HL
PUSH ... add hl,de
LD A,(COUNT)
DEC A ...
LD (COUNT),A
JP ... which means you might copy bytes to line 8, then ...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 …
... of the screen (4096 bytes) from my Backbuffer to ... 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H,( ... br /> ; SCREENTABLE
; HI BYTES OF SCREEN
ORG 0FB00H ... />
; LO BYTES OF SCREEN
ORG 0FC00H ...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 …
... /> PP1:
LD (HL),C ; LD (0FE00H),FDH
... 256 BYTES FORWARD IN MEMORY TO FB0AH
LD ... ; SCREENTABLE
; HI BYTES OF SCREEN
ORG 0FB00H ...
; LO BYTES OF SCREEN
ORG 0FC00H ...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…
... per byte copy, albeit 14 bytes per block rather than the ... more convenient 16 bytes per block that Gasman's ... /> At 12.5 T, 4096 bytes gets copied in 51200 T ... stack-copy code with the "ld sp,nn". This way you ...Smooth Screen ScrollingHi Everyone, Any suggestions on what is the best way to do horizontal scrolling ie. in Zynaps fashion. I am working on a routine at the moment, whi…
... like this:
ld hl,winend ; point to last ... byte in window.
ld bc,4096 ; size of ... dec bc ; loop counter.
ld a,b ; high byte of ... a block of 256 bytes then required just the ...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 hl,16400
ld a,255
ld (hl),a ... .
ld e,a
ld hl,16384
ld bc,6144 ...
cs0: ld a,0
ld ... .
; note low and high bytes swapped !
DEFW 0801fh ...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 …
... , then you've scrolled 12 bytes, PUSH the whole lot back ... the line (after doing 32 bytes worth of this) is place ... the line again, POP HL, LD DE,0, ADC HL,DE ...
