shforstv by Paulo Simoes [web]
screenshot added by Mr. Styckx on 2009-04-28 20:45:51
platform :
type :
release date : november 2006
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popularity : 50%
  • 0.73
alltime top: #17693
added on the 2009-04-28 20:45:51 by Mr. Styckx Mr. Styckx

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This small demo was originally posted on atari-forum.com to show the use of some advanced synchronisation with the shifter, allowing to do hardscroll with 4 raster lines of cpu.

It only features a vertical scrolling, so it's more interesting code-wise than design-wise.

Although Steem or Saint may not run it, it will work with Hatari 1.3

Nice work from Paulo who pushed the ST limits.
I contacted him in 2007 and he said he was retired!
Pff. Atarians.
rulez added on the 2009-04-28 22:47:48 by xernobyl xernobyl
The fastest syncscroller ever on the ST, 3 scanlines + syncline ! Are there any sources available?
rulez added on the 2009-04-29 07:41:47 by evil evil
Technically impressive...
rulez added on the 2009-04-29 08:37:50 by HarryPotter HarryPotter
No source available as far as I know but by reading http://www.atari-forum.com/viewtopic.php?f=68&t=9527 coders shold be able to understand how it works (the main part is to be able to create a 0 byte line in 50 Hz, which requires a 2 cycles precision and depends on the "wake up" state of the ST).
Also, I think the .blk file contains all lines length for the 256 possible combinations.
tried it with hatari 1.2 (did not find 1.3) does not compute.
added on the 2009-04-29 20:38:01 by Zweckform Zweckform
Worked for me with Hatari 1.2 (osx/ppc)....
great, thanx for submitting it.
rulez added on the 2009-05-02 19:46:44 by seppjo seppjo
Source code available here:
added on the 2011-06-20 09:47:46 by ljbk ljbk
Pushing the limit, fucking once again. Crazy.
Worked on Steem SSE 3.4.1.

Big thumb, big rulage!
rulez added on the 2013-01-24 01:18:46 by Buckethead Buckethead
I had fun testing this back when it was made! It was nice to see that a SUCH A sync scroll could be made to work also correctly on STE.
rulez added on the 2019-12-28 19:56:37 by MiggyMog MiggyMog
finally found that demo :)
rulez added on the 2020-07-18 11:06:50 by Blast! Blast!
Great technical stuff
rulez added on the 2020-07-18 15:44:16 by keops keops

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