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lft
Registered: Jul 2007
Posts: 369 |
GCR decoding on the fly
Here's how to do it:
http://linusakesson.net/programming/gcr-decoding/index.php |
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PAL
Registered: Mar 2009
Posts: 292 |
the only thing i do understand here is that you are insane great at making solutions to problems that no other have been able to solve... when krill say that is awesome i guess your loader is pretty awesome... hats of for that! |
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Skate
Registered: Jul 2003
Posts: 495 |
omfg! amazing thinking on how to get rid of bit shiftings using tables. probably people who had tried this missed using "no sequence of three zeros" rule as the key point for creating tables. biiiig thumbs up! |
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Killsquad
Account closed
Registered: Jun 2005
Posts: 17 |
foooOOOFFF.. the sound of this as it went straight over my head. Brilliant work, again, LFT. Even though I didn't understand all of this :D. |
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Zyron
Registered: Jan 2002
Posts: 2381 |
As above. ;) |
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tlr
Registered: Sep 2003
Posts: 1791 |
Very clever implementation! Excellent use of undocumented opcodes to mask a single read value in more than one way.
I love it how you are also a good technical writer being able to explain things in a concise manner and at the same time providing the context of the problem.
Keep inventing! |
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algorithm
Registered: May 2002
Posts: 705 |
Very innovative! Keep up all this work. Nothing is impossible :-) |
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Ejner
Registered: Oct 2012
Posts: 43 |
That is just really mindblowing! I'll have to read that again a few times! :-) It's really interesting, but I kind of lost track and concentration when I came to the part with illegal upcodes and "zeroes are stronger than ones" and stuff... It seems that this is what noone else have been able to do or figure out for the past 30+ years. -You finally did it! :-) A milestone in c64 history... Thanks for sharing! :-) |
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Clarence
Registered: Mar 2004
Posts: 121 |
Great achievement Lft, can you tell an estimation, how much faster can a loader be using this technique? |
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MagerValp
Registered: Dec 2001
Posts: 1078 |
I had to read it twice, since it was too brilliant for my puny mind to grasp on the first try.
Quoting ClarenceGreat achievement Lft, can you tell an estimation, how much faster can a loader be using this technique?
Instead of read -> decode -> transfer, it's now read & decode -> transfer. If your loader currently is using, say, interleave 5, it can now use interleave 4 (unless I'm missing something). |
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Oswald
Registered: Apr 2002
Posts: 5095 |
okay no words for this. congratulations you are officially a genius. chuck norris of c64 :) |
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