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Screen buffer Tip from Raff CeccoRaff very kindly gave me this tip: "Incidentally, I remembered a trick I used on the Z80 for extra speed: When clearing the screen buffer, it was a…
... :
When clearing the screen buffer, it was actually much quicker ... the end of the screen memory area and push zero values onto ... the stack until the screen area ... this worked because you could push 16 bits of data in ... -
Return of Speccy screen buffer formatI recently discovered that the Spectrum screen buffer format that allows only two colours in an 8x8 pixel block has made its return in a slightly dif…
... recently discovered that the Spectrum screen buffer format that allows only two ... -
Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... . Now I'm experimenting with screen buffer where I could draw my ... I would copy it to screen memory.
You may ... just copying static image from buffer to screen after HALT.
Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... that stack pointer cheese and push/pop is faster to move ... use push/pop, but copying a four character sprite to the screen ... takes three cycles of push/pop.
screen buffer into 2x1 blocks and keep ...Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
... to blit my back buffer to the screen RAM, and it ... stack to push and pop stuff to the screen, I gave ... lines from memory to the screen.
Can ... br />
ld sp, buffer
pop af
pop ... />
ld sp, screen+18
push hl
pop de ...off screen bufferwhen using an offscreen buffer is the memory copied to the screen in a way that makes it easier to draw sprites to the buffer? E.g. Lets say you…
... offscreen buffer is the memory copied to the screen ... of the screen where you copy your buffer to,
if the buffer was copied to the screen so that the ... /> draw background on buffer (or just clear it ... draw sprites on buffer
copy buffer to screenScreen Viewer: Speccy View 4SpeccyView (v4.0) Here is my new zx spectrum screen viewer, result of this weekend's work. Features: Loads: -Standard Screen Files (6912 byte raw …
... /> Features:
Loads:
-Standard Screen Files (6912 byte raw .scr ... games)
-Sna File (Shows screen buffer of ram image, 48k/128k ... match border colour to the screen,
-Loading and header ...
Hotkeys
Save screen to Scr, Png, Bmp, Jpg ...Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... sprites routine method of a screen buffer and when I finish to ... I dump all the buffer in the real screen. The problem is ... that the action screen must be little becouse if ...Textured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…
... Leave some space for shadow screen buffer
20 GO SUB 9000 ...The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... for experimentalists who managed to push the display resolution from ... They barely update the screen fast enough to fit between ... allows you to alternate what screen buffer you were updating and ... (usually they were title screen special effects). A few ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... at a time in the buffer
////////////////////////////////////////////////////////////////////
. ... br /> pop hl
push de
ld de,33 ... from buffer to screen
////////////////////////////////////////
.dump
push hl ...Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... entire graphics buffer is stored in this sequence
push hl
screen buffer and special drawing/printing procedures ...Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... graphics buffer is stored in this sequence
push hl< ... amount of memory for the screen buffer and special drawing/printing ... xx T/byte
PUSH/POP in theory 10.5 ... br /> LD HL, xx / PUSH HL 10.5 T/byte ... was example of very fast push/pop copy routine. he ...Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... corrupt the screen in the process.[/QUOTE]
In PUSH-filler case ... in register pair and PUSH it into screen buffer) interrupts can be enabled ... POP then write it to screen buffer) you have slightly more problems ...A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... LineScrolledUp
ScrollUpLastLineInScreen
push bc
call GetLineAddrOne ;source ... bytes - one ZX screen line in the scroll buffer
db 0 ... now points to required screen byte
PUSH HL
LD ...Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... don't store your screen buffer in the same way ... copy each line of the screen buffer to the display, fetching ... could even make your screen buffer bigger, so you can ... to read off the screen address straight into a ... . Just remember not to PUSH or POP anything, and ...Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... ]So, don't store your screen buffer in the same way as ... , copy each line of the screen buffer to the display, fetching the ... . You could even make your screen buffer bigger, so you can copy ... line. Just remember not to PUSH or POP anything, and to ...Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
...
isr: push af
push bc
push de
push hl ; save ... />
.nextbuffentry
; check for buffer end
ld a, b ...
jp z, .finished
push hl
; get destination address ... map from backbuffer to real screen buffer.'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…
...
The arrangement of the screen buffer is another of those things ... ]
The screen buffer starts at location 64*256 ... br />
next_scanline:
push bc ; Free up a register ... slightly odd way that the screen buffer is organised
; ...Arkanoid Hack - Your Sinclair Smash TipsRemember that Arkanoid hack in YS Smash Tips that didn't work? It does now... [CODE] 10 REM ARKANOID HACK 20 CLEAR 65535: LET C=1: LET D=23295 …
... br /> ;
dcrloop push bc ; preserve decryption loop ... ld b,$00
push bc ; preserve decrypter length ...
push hl ; preserve decrypter address< ... decrypter to
ldir ; screen buffer
chksp1 ld hl,dcbuff ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... LDIR instruction to move the screen buffer from memory to where you ... avoids any problems with the screen refresh that occurs every ... the stack. Using PUSH to write into the screen is faster than ... contention), LDI takes 16, and PUSH writes two bytes in just ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... QUOTE=joefish;707054]Also a PUSH takes 11 cycles, or 16 ... each PUSH is highly conservative. In my experience with double screen buffer ... enough, every time you access screen memory, you have 8 ... /> tacts of delay per screen memory access. Using words halves ...Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... ]
LD HL,NN
PUSH HL
LD HL,NN ...
PUSH HL
LD HL,NN ...
PUSH HL
LD HL,NN ...
LD HL,NN
PUSH HL
...[/QUOTE]
screen buffer for example) are a "part ...Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
...
di
ld sp, buffer
pop af
pop ...
ld sp, screen+18
push hl
pop de ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... , your screen buffer is in linear order instead of Spectrum screen order? Good ... want it to go, and PUSH all those registers (in ... fetches a value from memory; PUSH moves the stack pointer plus ... Also, don't forget this buffer screen can be bigger than your ...Buffer to screen - how much?[FONT=Calibri][SIZE=3]I am starting to build a new game and am researching different ways to accomplish what I need to do. My question is, is it poss…
... is the stack PUSHing the buffer to screen behind the scan line ... can switch between the corresponding screen & buffer addresses just by toggling ... PUSH ([I]or even LDIR dare I say!) [/I]your buffer to screen ...ZX Uno programming competition[b]Rules[/b] - The game tematic is free. The languaje can be english or spanish. - You must use Radastan video mode in the game as principal. - …
... (128x96x16)
;To generate a screen compatible with the Radastan mode ... the Spectrum screen buffer
ld b,96
BucPintaScans push bc
off screen bufferwhen using an offscreen buffer is the memory copied to the screen in a way that makes it easier to draw sprites to the buffer? E.g. Lets say you…
... the downsides are that a screen buffer is a big overhead for ...
LDI background from buffer to screen to delete
OR ... to sprite
sdlp: push bc
ld h,d ... /> spriteOR:
...directly onto the screen and quickly...
[/ ...Loadsa bullets on screen (silkworm)Did games like silkworm just draw everything to the screen or did they have complicated optimisations? and the types of games where sprites can occu…
... just draw everything to the screen or did they have ... to buffer in this order: background (regular black / white flash) by PUSH ... is drawn, LDI copy moves screen buffer to screen. The scrolling belt at ... is redrawed directly in screen, it is not part of buffer.Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... to next
push hl ;save the plasma table ... /> jr c,a2s_l ;
push de ;save ATTRs address
ld a,(de) ;get SCReen buffer byte
and b ;mask ...
