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Forums > C64 Coding > Keeping a few bits of information in a hostile environment
2021-04-18 09:24
Krill

Registered: Apr 2002
Posts: 3098
Keeping a few bits of information in a hostile environment

If not reserving space in RAM, where would read-writable data be most likely to survive throughout the run-time of any random demo or game?

$D800-$DC00 is often overwritten entirely, $00/$01 in RAM are too cumbersome to access.

$DD03 (parallel port data direction register) might be good, or maybe the 2x4 CIA TOD registers at $DC08 and $DD08.

Or are they? What else could be usable for that purpose? =)
 
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2021-05-17 00:42
Copyfault

Registered: Dec 2001
Posts: 487
Quoting Krill
Meanwhile, i have actually managed to query drivetype before uploading the appropriate piece of custom code. =)

All without any extra code on 1541 side or in the resident loader portion.

So no hiding nor manual shuffling-around of those two bits required. \=D/
This is worth a huge HOORAY!!!

Kudos for getting it done... and thanks for putting effort into it.


Shall I use that "most elegant"-phrase more often ;) ??
2021-05-17 21:35
Zibri
Account closed

Registered: May 2020
Posts: 304
Quote: The better your heuristics, the more (H)EUREKA! moments you'll have.

Precisely.
Eureka comes from the same verb (Eurisko) and it's the first person of the past tense: Literally: "I FOUND [it]" :D
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