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"Chronos": how fast should it really be?I was reading [URL="http://timfollin.pwp.blueyonder.co.uk/Archive.htm"]Tim Follin's webpage[/URL] the other day and came across a curious remark abou…
... was running at half speed because of an assembler ... the [I]full[/I] speed. So I loaded it into ... scroller that shifts the off-screen buffer by 4 pixels ... /> No sane programmer would write such a code. This is ... " that runs at its true speed:
[url] ... -
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…
... use long sequence of PUSH instruction. PUSH can be used as ... restrictions. So game simply fills screen memory by preshifted patterns. ... draw more patterns at same speed ?
THREE
...
SEVEN
We could speed up things by reserving other ... -
display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... I've done a little screen slicing program in both assembler ... & move things on the screen once the structure of the ... the details:
The screen is divided into three segments ... calls by setting the block write length for each segment independently ... -
Childhood moments with my SpeccyHey everyone. The other day I randomly came across a tumblr page called "Me and My ZX Spectrum" ([url]http://meandmyzxspectrum.tumblr.com[/url]) …
... . Sure, I enjoy seeing people write incredibly clever pieces of code ... on the Atic Atac loading screen was done intentionally, to give ... dial! The TV had 12 push-buttons for preset tuning and ... at the message on the screen that read: CONGRATULATIONS! You have ... -
Push 'n' ChaseIt is my great pleasure and honor to announce the release of PUSH 'n' CHASE a game made with CGD featuring a wonderful loading and intro screen …
... a wonderful loading and intro screen made by the creator of ... am using the "skip the screen" option to show you all ... . Baddies can push the mines all over the screen and kill you ... Amore
Loading and intro screen, advises, critical suggestions, game testing ... -
Help with calculating screen addresses[SIZE=3][FONT=Calibri]I?m having a bit of a coding session whilst at work so can?t spend too much time on my current problem. I?m sure someone on thi…
... just inc or dec the screen address by one. Up and ... to cross one of the screen thirds. Assuming my cursor starts ... a bit of code to speed up my covert development :)[/FONT ... -
New game: Krunel[IMG]http://www.speccy.pl/images/news/krunel_00.png[/IMG] Game name: Krunel Type: logical Author/group: [url]speccy.pl[/url] Platform: ZX Spectrum …
... sound effects: V0yager
Loading screen: CatMan
Additional tiles sets ... . Increse of game level increases speed of the falling blocks. To ... all chip's registers are write-only there is no way ... -
SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
I've been using the SCREEN$() function recently for reading ... data off the screen rather than taking up ... fix for it. Instead of SCREEN$(row,col) use FN ... ;HL=$106E
push hl
push de
push bc
ld ... -
Reading from a Write FileI have been speaking with a customer who uses a small bit of machine code to do a screen dump. The machine code is 650 bytes long. The machine code…
... machine code to do a screen dump. The machine code is ... the error reading from a write file !!
Any ideas ... -
A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
...
Nowadays if you write [B]"multicolor"[/B] everyone assumes ... ]bicolor[/B] graphics everywhere* on screen.
In practice ... btiles"[/B] anywhere on screen (even partially hidden outside ... ENGINE is also "full-screen". Technically, perhaps it would ... -
Clear the screen from assemblerI want to clear the screen before I draw my graphic elements on it. Speed is not important so I was thinking of using the rom CLS option if that is p…
I want to clear the screen before I draw my graphic elements on it. Speed is not important so I was thinking of using the rom CLS option if that is possible. Can anyone advise on how to call this command or some similar routine to clear the screen? -
From RAM to dim v$() "video buffer" SPEED UP!Hi! This question is related to "quick RAM copy using LET in Basic" ([url]http://www.worldofspectrum.org/forums/showthread.php?t=44296[/url]). Wel…
... buffer" for paint whole level screen.
Works ok, but ... ...
Another methor for speed up?
I try ... -
Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... unrolled multicolour processing loop for speed.
;Use wrap-around attribute ...
;--------------
print_char_obj_hl_b_c
push bc
push hl
call print_attr_b_c ... ;hl = address of attr on screen
ld a,(print_attr_cache)
Developing "Push n Chase" into a good gameI was wondering if anyone would like to help developing my CGD "Push n Chase" into a good game. [url]https://www.youtube.com/watch?v=cdZ5XYbterc[/u…
... help developing my CGD "Push n Chase" into a ... are crates scattered around the screen, if you go over ... traps which you can push to kill your enemies. ... buy the crates (you push money bags against special blocks ... you are supposed to push blocks to clear the way ...Slow/fast games - change speedSome ZX games are too slow or too fast. Problem with speed is aslo in russian ZX games or thanks to different memory layout on zx128 and +2a models. …
... or too fast. Problem with speed is aslo in russian ZX ... />
Often can be increase speed in games if you remove ... is HALT instruction use for screen synchronisation, but also for slow ...Double Buffer UtilityHi Folks, I've been experimenting with double buffering on a 48k Speccy for a small project I'm working on. After reading lots of good advice here…
... some Python code that will write the ASM for me based ... is to screen only - if you want to write to file then ... />
#6.4 - Push the registers to populate screen memory
numRegs ...Fast Condition TestingHello my friends, I have been writing some input and string handling routines in BASIC lately - yeah I could write them super fast in C/ASM via z88d…
... BASIC lately - yeah I could write them super fast in C ... /> obviously after all that the screen is updated so the user ... there is a way to speed it up, OR a better ...Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…
... to see if I understand push and pop when it comes ... />
LD A,5
Push AF
Ld A,7 ...
Push AF
call addfunc
ADD A,B
Push af
ret
screen address 16386
its ...Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …
... The following correctly fills the screen with vertical lines. This ... br /> ld c, 0 ; Screen Normal
... ld c, 8 ; Screen Shadow
call change_bank< ... 0x01 ; Value to write to the screen
ld de, ...A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
... ’s an optimized (for speed) real-time sprite shifting ... number of shifts or current screen/sprite data address. Instead ... />
msl_draw_loop
push bc ;store counter
ld ... msl_shift_done
ex de,hl ;screen address -> DE, spite data ...Just watched Paul Jenkinsons's spectrum chanel and now want to write code againPlease assume for the purpose of this thread I know nothing... I want to look to write games on the spectrum but want to develop and test on my wi…
... /> I want to look to write games on the spectrum but ... to do with the nag screen).
As I don ...No-tearing (“vsync”) Full Screen FadeSeeing as most screen fades exhibit visible tearing, I wrote my own routine which does away with that problem. Simple, effective, short, and fully re…
Seeing as most screen fades exhibit visible tearing, I ... de ;until we reach active screen area,
ld a,d ... INK
ld (hl),a ;write attr
inc hl ;next ...ZEsarUX-7.0Hi! I have uploaded a new ZEsarUX stable version :) This is ZEsarUX 7.0 There are a lot of new features added, more than ever! You can downl…
... again!
Added setting to write protect IDE, MMC, ZX-Uno ... : view TV electron position on screen, new default view, cursor, ... ZRCP)
* added function to write byte to file on ZEsarUX ... is distorted when setting top speed
Improved autoload: new ...Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…
... />
Looking for ideas to speed things up.
Things ... aY)
_drawstringz::
push ix
push iy
ld ix ... 're full, flush byte to screen
ld c, #0x08
; Put last byte on screen
ld (hl),b
How do emulators make code appears as running at 3.5Mhz?Decent Z80 emulators on github return t-states after executing an instruction, giving you the ability to emulate Speccy relatively well. But there ar…
... I were to write code to emulate screen I would check ... imagine this affecting accuracy of screen paint? For example, ... . If we update the screen after the whole instruction, ... runs at 100% original Speccy speed, to make games playable. ... emulator to actual speed.Multi-Platform Arcade Game DesignerFirst of all, I should say Hello, having left the Spectrum scene around a year ago. I'm not planning to make a return but figured that I have some n…
... etc in Windows editors, write your code in AGD script ... no longer loses your screen data but keeps as ... You could, of course, write a much simpler game with ... parameters so you can write more sophisticated code. There ... you can set the speed of animation. You can ...Fastest emulator screen renderingHi, I'm developing an algorithm for fast emulator screen rendering and here is what I came up with. 1) Use 4bpp indexed image format as target …
... an algorithm for fast emulator screen rendering and here is ... algorithm.[code]byte=next screen byte // get next screen byte
p32 ... line for y and continuously write 32 bit values to ... alg from point(4)
write to img4bpp_addr
increase ...
