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Author Topic: ThePenguin77 Removes the Last Traces of TI from his Calculator  (Read 34325 times)

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Offline Camdenmil

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #60 on: June 29, 2011, 03:54:35 pm »
Mode 0 is just the 8080 compatible mode, mode 0 in hardware is much different and impossible through software on the 83+...if only we had the pinout to the asic.
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Offline DJ Omnimaga

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #61 on: June 29, 2011, 03:59:34 pm »
Quote from: Darl181 on June 29, 2011, 11:58:16 am

Quote from: shmibs
is there anything else that remains to be done, now?
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Offline calc84maniac

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #62 on: June 29, 2011, 04:25:10 pm »
Quote from: DJ_O on June 29, 2011, 03:59:34 pm
Quote from: Darl181 on June 29, 2011, 11:58:16 am

Quote from: shmibs
is there anything else that remains to be done, now?
  ↑
Starcraft over gCn.
Even better, Flash Player for starcraft.swf
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Offline AngelFish

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #63 on: June 29, 2011, 04:32:33 pm »
Quote from: ralphdspam on June 29, 2011, 12:31:51 pm

Also, we could do more reverse engineering on the ASIC.

You'd be surprised how much has already been done. I believe we have [nearly] complete schematics for several of the important components.
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Offline ralphdspam

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #64 on: June 29, 2011, 07:28:41 pm »
Quote from: Hot_Dog on June 29, 2011, 02:06:09 pm
Quote from: ralphdspam on June 29, 2011, 12:31:51 pm
Quote from: shmibs on June 29, 2011, 11:51:11 am
is there anything else that remains to be done, now?

I'd like mode 0 interrupts/extra i/o ports on the 1999 83+'s.

Please correct me if I'm wrong, but in order to have mode 0 interrupts, we'd have to redesign the Ti-83+ HARDWARE.  No software in the world could make use of mode 0 on the current Ti-83+s.

Yes, you would have to have extra hardware, but we should do it to prove our 1337ness.  ;)
« Last Edit: June 29, 2011, 07:35:18 pm by ralphdspam »
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Offline DrDnar

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #65 on: June 29, 2011, 07:44:26 pm »
I did some tests that suggested that the TI-84+/SE always sends FFh as the byte for IM 2, in which case IM 0 would actually be usable (the ISR would be the RST 38h routine).
« Last Edit: June 29, 2011, 07:45:59 pm by DrDnar »
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Offline calc84maniac

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #66 on: June 29, 2011, 09:44:34 pm »
Quote from: DrDnar on June 29, 2011, 07:44:26 pm
I did some tests that suggested that the TI-84+/SE always sends FFh as the byte for IM 2, in which case IM 0 would actually be usable (the ISR would be the RST 38h routine).
Definitely not on TI-83+BE, though
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Offline calcdude84se

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #67 on: June 29, 2011, 10:32:13 pm »
But what would trigger the interrupt in mode 0? It might go somewhere predictable, but would it ever trigger?
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Offline calc84maniac

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #68 on: June 29, 2011, 10:33:46 pm »
Quote from: calcdude84se on June 29, 2011, 10:32:13 pm
But what would trigger the interrupt in mode 0? It might go somewhere predictable, but would it ever trigger?
It triggers if interrupts are enabled and an interrupt is requested :P
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Offline calcdude84se

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #69 on: June 29, 2011, 10:37:21 pm »
Ah. Sorry, I was confusing IM0 with NMI :-[ (I don't think the hardware ever generates those, right?)
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Offline ralphdspam

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #70 on: June 29, 2011, 11:32:20 pm »
IM0 is when you have an external piece of hardware place an opcode on the Databus to be executed.  It's possible to do on the first 83+ BE's because the z80 is exposed.  I don't know much about the ASIC, so I'm not sure about the later models.
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Offline calcdude84se

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #71 on: June 29, 2011, 11:37:23 pm »
Quote from: DrDnar on June 29, 2011, 07:44:26 pm
I did some tests that suggested that the TI-84+/SE always sends FFh as the byte for IM 2, in which case IM 0 would actually be usable (the ISR would be the RST 38h routine).
ralphdspam, as DrDnar has said, the TI-84+(SE) seems to put $FF on the databus. ;) (Which would make IM0 equivalent to IM1, it seems)
« Last Edit: June 29, 2011, 11:37:44 pm by calcdude84se »
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Offline ralphdspam

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #72 on: June 29, 2011, 11:47:26 pm »
Why did they do that? Anyways, there would be no point of that on the 84+SE, then. 
I'm talking about applying IM1 to the original 83+BE's. 
« Last Edit: June 29, 2011, 11:49:27 pm by ralphdspam »
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Offline calcdude84se

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #73 on: June 29, 2011, 11:50:04 pm »
On those the databus seems unpredictable, IIRC. This means that your calculator will execute some random instruction (and probably crash :P)
« Last Edit: June 29, 2011, 11:50:28 pm by calcdude84se »
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Offline calc84maniac

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Re: ThePenguin77 Removes the Last Traces of TI from his Calculator
« Reply #74 on: June 29, 2011, 11:51:37 pm »
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.
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