Author Topic: ThePenguin77 Removes the Last Traces of TI from his Calculator  (Read 21221 times)

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Offline ralphdspam

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #75 on: June 29, 2011, 11:52:30 pm »
eew, we don't want that to happen... I wonder if I/O would be possible with those calcs, or would the databus be unpredictable as well?
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Offline calcdude84se

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #76 on: June 29, 2011, 11:54:50 pm »
Wait, what? ??? For I/O we have the linkport, no?
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Offline ralphdspam

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #77 on: June 30, 2011, 12:03:00 am »
No, I mean using the databus for I/O
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Offline calc84maniac

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #78 on: June 30, 2011, 12:03:43 am »
No, I mean using the databus for I/O
I think that's what ports are for...
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Offline ralphdspam

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #79 on: June 30, 2011, 12:07:09 am »
Yes, I mean connecting an external device to receive I/O read/writes from the Z80.  (From the old 83+BE's, of course)
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Offline calc84maniac

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #80 on: June 30, 2011, 12:09:18 am »
Yes, I mean connecting an external device to receive I/O read/writes from the Z80.  (From the old 83+BE's, of course)
Well, the databus is in an unknown state when an interrupt occurs (because that could happen at any point in an executing program). Of course it will be in a known state when actually doing port outputs and stuff.
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Offline DrDnar

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #81 on: June 30, 2011, 01:11:18 am »
The previous generation of programmers say that the TI-83+ leaves whatever was the last value on the bus. Thus, it's effectively random. In my tests, the ASIC models don't seem to do this.
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Offline Camdenmil

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #82 on: June 30, 2011, 01:33:39 am »
Do you mean newer 83+'s too?
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Offline DrDnar

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #83 on: June 30, 2011, 03:33:59 am »
That's something important to check. Do the newer TI-83+s have the other new ports, too?
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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #84 on: June 30, 2011, 03:46:50 am »
Hmm... somebody needs to test IM 2 with TI-83+SE. If it's always 0xFF, then this might be a useful fact for programs meant to run only on 15MHz calcs.

I know for a fact that the 84+BE has predictable IM2 vectors whereas the 84+SE does not.  This was the major bug I found when I first released Pyoro.
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Offline calcdude84se

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #85 on: June 30, 2011, 04:03:30 am »
In other news, BrandonW has successfully updated the boot code on his TI-84+ to 1.03, making it think it's a Pocket. :D
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Offline TIfanx1999

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #86 on: June 30, 2011, 04:20:07 am »
Lol, that's pretty funny. :D

Offline BrandonW

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #87 on: June 30, 2011, 04:20:36 am »
Going from 1.03 to 1.02 is equally as easy. 1.03 is defeated in oh-so-many ways.

Offline Lionel Debroux

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #88 on: June 30, 2011, 04:24:01 am »
Very interesting :D

@TI: watch this disaster unfold - you've added a protection, and the result, obtained in short order, is not only complete defeat of the protection, but also, additional insight gained into your calculators (e.g. ports 21, 25, 26). Congratulations ;)
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Offline TIfanx1999

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #89 on: June 30, 2011, 06:33:04 am »
Going from 1.03 to 1.02 is equally as easy. 1.03 is defeated in oh-so-many ways.

Awesome. =) They should really just give up. After all, the community knows their hardware better than they do.