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Omnimaga
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IM 2 on SE/84+ hardware
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Topic: IM 2 on SE/84+ hardware (Read 3190 times)
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DrDnar
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IM 2 on SE/84+ hardware
«
on:
July 14, 2011, 05:11:29 am »
Remember how in IM 2, the high byte comes from the I register and the low byte of the address for your ISR is random? That may have been true for the TI-83+, but I don't think it's true for the TI-83+SE and TI-84+(SE). A while ago, I did some tests on my TI-84+SE that suggested that in IM 2, the only vector that ever gets used is the FF one. Now, once again, I have written a slightly more advanced tester, based on MicrOS, to keep track of what vectors are issued. Attached is a program for this and its source. Be aware, this program erases all of your RAM. Run the program, and you just get a basic hex editor, starting at address 6200. Address 6200 is the start of a table keeping track of how often a particular IM 2 vector is used. Each entry is two-bytes, so to check how often 20h was used, go to 6240h. The only vector I have ever seen is FF (63FE). Does anybody else with TI-83+SE or TI-84+(SE) ever see a non-zero value in the 6200h to 63FDh range?
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Mighty Moose
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Re: IM 2 on SE/84+ hardware
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Reply #1 on:
July 14, 2011, 11:03:49 am »
Yes, on my 84+SE S-0404 with ViewScreen port. The vector seems to be random, writing to various bytes between 6200h and 6400h. On my 84+BE S-0306F it appears "normal" (nothing but 63FEh written to). Could this have to do with the ASIC version or port 15 at all?
EDIT: 100th post!
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Last Edit: July 14, 2011, 11:04:08 am by Mighty Moose
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thepenguin77
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Re: IM 2 on SE/84+ hardware
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Reply #2 on:
July 14, 2011, 11:32:46 am »
Yeah, DrDnar, I made a test like this a long time ago, and I can say that mine is random. It favors some addresses, but in the end, it's unpredictable.
I just ran mine and I get hits in random blobs about every 30 bytes.
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DrDnar
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Re: IM 2 on SE/84+ hardware
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Reply #3 on:
July 14, 2011, 04:53:31 pm »
It could indeed be very related to the ASIC revision. Perhaps only the ones that read 45 from port 15 are predictable? Which would make this kind of useless.
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"No tools will make a man a skilled workman, or master of defense, nor be of any use to him who has not learned how to handle them, and has never bestowed any attention upon them. . . . Yes, [] the tools which would teach men their own use would be beyond price."—Plato's
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ralphdspam
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Re: IM 2 on SE/84+ hardware
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Reply #4 on:
July 14, 2011, 07:11:16 pm »
Hmm... Sound interesting. It would be nice if we didn't have to fill that huge space with all the same number.
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IM 2 on SE/84+ hardware