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Krill
Registered: Apr 2002
Posts: 3082 |
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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Rastah Bar
Account closed
Registered: Oct 2012
Posts: 336 |
Thanks for the explanations! |
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Cruzer
Registered: Dec 2001
Posts: 1049 |
Had to look up heuristics, and found this very useful definition...
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map
Registered: Feb 2002
Posts: 27 |
Quoting KrillBut then i think the simple and safe solution of having the user shuffle over the drive type from installer return values struct to save/code upload parameter struct is acceptable.
Not as elegant, of course. =)
From all mentioned approaches this one sounds the best from my point of view. Leave the responsibility to find a good spot in the memory to the integrator of the Loader. Agreed, that it is less elegant.
Maybe having the Drive code to send some identification would be a good aproach as well as mentioned before but will cost not available resources and creates overhead. |
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Sparta
Registered: Feb 2017
Posts: 51 |
While waiting for Krill's saver plug-in, try out Sparkle 2's hi-score file saver! :) |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting CruzerHad to look up heuristics, and found this very useful definition...
lol for the "useful definition", anyway:
Heuristic comes from ancient greek and it's root is the verb EURISKO which means "to find".
A heuristic algorithm is a non deterministic one, is an algorithm, usually slower but sometimes needed, which employs a search function for a predetermined pattern or behaviour. Our brain for example uses both but mainly the heuristic method.
In short, any heuristic program or line of thought, basically does an "educated guess". |
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Krill
Registered: Apr 2002
Posts: 3082 |
The better your heuristics, the more (H)EUREKA! moments you'll have. |
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Krill
Registered: Apr 2002
Posts: 3082 |
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/ |
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JackAsser
Registered: Jun 2002
Posts: 2038 |
Quote: 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/
Ossom!! |
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Copyfault
Registered: Dec 2001
Posts: 487 |
Quoting KrillMeanwhile, 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 ;) ?? |
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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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