pouët.net

0xF information 306 glöps

• general:
• level: user
• personal:
• first name: Piotr
• last name: Fusik
• cdcs:
• cdc #1: Bitter Reality by Slight
• cdc #2: Reditus by Zelax
• cdc #3: Rewind by New Generation & Zelax

• 32b 64b Atari XL/XE Dither City by Taquart
• It's a linear gradient from black to 75% white, using hardware-accelerated pseudo-random dithering.
  
  It's very fast for 320x192 on a 40-year-old hardware because:
  1. The 8-bit pseudo-random number is retrieved from the POKEY chip's RANDOM register which gets updated every cycle. The pixel value is computed by comparing the Y coordinate with the value of RANDOM: pixel_is_white=(RANDOM<=Y).
  2. It writes directly to screen RAM. The OS "plot" would be slower by several orders of magnitude.
  
  The source is on GitHub.
  
  This technique can be used for any 256-level grayscale effect in hires. It takes one instruction (compare with RANDOM) to convert the grayscale level in one of the three CPU registers to the dithered pixel in the C flag.
• isokadded on the 2021-10-14 09:53:39
• 32b 64b Atari XL/XE Dither City by Taquart
• This prod is 32 bytes of code plus a mandatory 6-byte header, which was excluded by compo rules. This makes the whole file 38 bytes long, hence I selected two categories on pouet.net.
  Originally the prod was smaller, but not that fast.
• isokadded on the 2021-03-14 14:17:49
• 32b Atari XL/XE Korporazka by Taquart
• My very first 32-byte prod.
  Yeah, now I know there are other Sierpinski's in 32 bytes, but I didn't know that when I coded it. Only looked up 32-byte prods at pouet later.
  If you think what effect you can squeeze in 32 bytes, Sierpinski is simply an obvious choice.
  The whole prod is 32 bytes long, including the mandatory 6-byte header, even though the compo allowed 32+6 byte prods.
• isokadded on the 2021-03-14 13:52:44
• 256b Atari XL/XE Escape Time by Taquart
• It won’t fit. It is 255 bytes after many size optimizations. See commits on github. I even patched my 21-year old 6502 cross-assembler to emit shorter instructions. :)
• rulezadded on the 2019-12-19 14:31:14
• demo Atari VCS rocket nation by Altair
• Wow! This combination of VCS graphics, sprites and parallax-scrolling sky is a masterpiece!
• rulezadded on the 2019-12-09 19:22:19
• demo JavaScript Δ by Jumalauta [web]
• Good for a 256. Oh, it's not 256?
• sucksadded on the 2017-09-19 23:01:23
• demo Atari XL/XE Arsantica 3 by Desire [web]
• Nice demo!
  The voxel looks great. The tilt/rotator is amazingly fluent.
  A big plus for fullscreen pictures, very rare in Atari 8-bit demos.
  And you have managed to fit it all into 64K RAM, congratulations!
  I disagree with the other comments saying this demo lacks design. But certainly it could be more polished.
• rulezadded on the 2016-04-30 10:57:58
• demo Windows Sweet dreams by Rebels
• My favorite candy are herrings.
• sucksadded on the 2015-08-10 21:49:11
• 64k Windows fr-097: Digital Doomsday by Farbrausch [web]
• 6502-based robots will rule the world!
• rulezadded on the 2015-08-10 21:31:38
• demotool Linux Windows Android RECOIL
• IrfanView 4.38 includes RECOIL 3.0.0 in its "Formats.dll" plugin.
  
  RECOIL 3.1.0 is now available.
• isokadded on the 2014-06-27 11:56:44