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Joined: 04 Feb 2009
Posts: 132

Posted: 23 May 2010 03:54:35 am    Post subject:


Using Java code, I've managed to extract the ROM code from the official TI-34 MultiVieW / TI-30XS MultiView / TI-College Plus (french) emulators.

The CPU seems to be a 4-bits Toshiba T4X/T49.

Unfortunately, I have not managed to find the instruction set on the Internet.

Does anybody have any hint?
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Joined: 09 Aug 2009
Posts: 207

Posted: 23 May 2010 09:51:41 am    Post subject:

I didn't look hard, and I couldn't find anything (as is expected)
Hmm... maybe if we stare at it long enough... Razz
How'd you get the ROM's?
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Lionel Debroux


Joined: 01 Aug 2009
Posts: 170

Posted: 23 May 2010 11:45:13 am    Post subject:

You can get the raw ROMs by somehow looking into TI's emulators, which are made of Java bytecode which uses some native code.
[EDIT: I've just seen that critor has published a dumper: ]

Last edited by Guest on 23 May 2010 12:32:54 pm; edited 1 time in total
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Active Member

Joined: 23 Feb 2006
Posts: 564

Posted: 25 May 2010 08:01:53 am    Post subject:

How sure are you of that MCU part number? Most of Toshiba's sites only seem to list 8 bit MCUs and up, though their Chinese site led me to the TLCS-47 family (datasheets are available if you click through, e.g. 47 series instruction set). It's the only information about 4-bit Toshiba MCUs I've been able to find!

Last edited by Guest on 25 May 2010 08:03:05 am; edited 1 time in total
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Lionel Debroux


Joined: 01 Aug 2009
Posts: 170

Posted: 25 May 2010 02:16:34 pm    Post subject:

There are some references to "T49" in the Java bytecode. However, we don't know whether "T49" refers to an actual part number.
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Advanced Member

Joined: 22 Aug 2008
Posts: 472

Posted: 27 May 2010 09:48:20 pm    Post subject:

Fascinating. Maybe this is related to the weird CPU used in the TI-80?
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