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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 …
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 …
... /> INC HL
POP BC
;| this cycle makes ... /> INC HL
POP BC
DJNZ DRAWMID
... br /> DRAWEND
PUSH BC
EXX
LD ...Calculate screenaddressWho knows where the topic about the fastest screenaddressroutine is? I can't find it in a search.. The fastest routine was to load a large table of …
Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…
...
Spriteloop:
PUSH BC
CALL MoveSprite< ... DE
POP BC
DJNZ ... HL Contains Screen Address
; BC preserved
; Example ...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
...
Spriteloop:
PUSH BC
; Is ... HL Contains Screen Address
; BC preserved
; Example ...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 …
... /> lp1:
PUSH BC
PUSH DE
POP BC
LD A,(YPOS ... PUSH AF
PUSH BC
PUSH HL
POP BC
POP AF
...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... /> INC B
PUSH BC
CALL WRITECHAR
POP ... /> INC B
PUSH BC
CALL WRITECHAR
POP ... /> INC B
PUSH BC
CALL WRITECHAR
...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…
... HL
PUSH BC
PUSH BC
INC ... HL
PUSH BC
PUSH BC
INC ... SP,HL
PUSH BC
PUSH BC
... ,HL
PUSH BC
PUSH BC
... BC,80
ADD IX,BC
ADD IY,BC
POP BC ...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…
... B-reg
prtab inc bc ; Start of tableprinting
dec ...Index register subtractionHi, Just wondering if there a way to perform SBC HL,BC on the IX or IY registers. I can't find an op code for it, and my assembler doesn't recognise…
... way to perform SBC HL,BC on the IX or IY ... strange however that ADD HL,BC can be prefixed to work ...IMAGINE SOFTWAREYes, I'm fully aware this is a Spectrum forum but.... I've recently picked up a VIC 20 game by Imagine Software called "MEGA VAULT". It's dated 19…
... games like "COSMIC CRUISER" and "BC BILL"
I'd ...Few games on eBay[url="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=8144330869&ssPageName=STRK:MESE:IT"]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&r…
... of six games - Cosmic Cruiser, BC Bill, Pedro, Zzoom, Zip Zap ...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…
... B,16
PRTTILELOOPX PUSH BC
PUSH DE
LD ...
POP DE
POP BC
INC E
INC ...Fastest way to write something to screen$Hi, I just got pasmo.exe and start playing with attr scrolling, well, not scrolling, just write different values to a block and see if I can introdu…
ANN: Tipshop updated Monday, 04 July 2005Monday 04 July 2005 June! (Oh, Terry? Ed)... Quite a large update this month, which I managed to get processed on time, despite being on holiday for…
Programming MC : first stepsIsn't nice to collect all kinds of short routines to help making the first steps into MC for everyone who never touched MC? What I mean is mostly th…
... hl ; save registers
push bc ; save registers
ld c ... (1 - n) restore
pop bc ; retrieve registers
pop hl ...Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... 0x11, in particular those like BC Quest, etc (and possibly ZX81 ...Optimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…
... ld de,16385
ld bc,6143
ldir
< ... ex de,hl
pop bc
ld (hl),c< ... /> inc hl
pop bc
ld (hl),c
Machine Code: quicksort optimisationI came across this z80 quicksort implementation when going through the wikipedia article on the same. It's 44 bytes long. I was wondering if any of …
... /> [quote]
;
; Usage: bc->first, de->last ... next2
ld a,(bc) ;swap (bc),(de)
ld ... a,(de)
ld (bc),a
ld a,h ... ;pop lo
push bc ;stack=left-hi
...Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …
... register = 1, If yes then decrement to 00 and carry on ...FP Calc QuestionWhen using the FP Calc (RST 28h) to perform a subtraction how do you find out what the sign of the result is? ie. +/-. For example if I stack two va…
... + or -500. I am using BC to stack and retrieve to ...ANN: Tipshop updated Tuesday, 28 March 2006Tuesday 28 March 2006 Lots of new POKEs and maps this month - AND the update is actually on time :) * Added C & VG as a listed source, and edited t…
... : The Dungeon of Drax ,
BC's Quest for Tires , Blizzard ...Spin save dissembly problemHey Dunny and others Spin dudes! There seems to be a small problem with the save dissembly function from the dissembler in Spin. This is the exact o…
... /> org $67c2
l_67c2: push bc ; 26562 11ts
push de ... de ; 26641 10ts
pop bc ; 26642 10ts
ret ; 26643 ...Problems with BC bill gameI have loaded this game with several emulators and game files with the same result: you can choose the input -> sinclair, kempston, etc but i cant st…
I have loaded this game with several emulators and game files with the same result:
you can choose the input -> sinclair, kempston, etc but i cant start the game itself. :???: Somebody has actually played with an emulator? Any help?
(Maybe ...Problem with rotating procedureHi folks! I wrote a proc in z80 asm, based on: x' = x * cos (z) - y * sin (z) y' = x * sin (z) + y * cos (z) I used a precalculated table of sin a…
... /> ;rotatez
;============================================================================
rotatez: ld bc,(anglez) ;xc=cos(anglez)*x ... (xc),de
ld bc,(anglez) ;ys=sin(anglez)*y ... (ys),de
ld bc,(anglez) ;xs=sin(anglez)*x ...
