LF: on my ti-92 cpu upgrade project

Subject: LF: on my ti-92 cpu upgrade project
From: Erik Buehler <erikb@ksu.edu>
Date: Tue, 19 Nov 1996 07:10:20 -0600 (CST)
In-Reply-To: <>

I have come across some new info.  The 10mHz version of the 68000 executes
around 3.3MIPS.  The 68060@66mHz executes around 100MIPS.  The two are
instructionally compatible, but the 68060 uses 214(?) pins and the 68000
uses 64 pins.  I have located a picture of the design packaging.  I have
opened up my 92 to see the chip, and have determined that the chip
packaging, # of pins, and pin placement are identical to the 68000 that is
commercially available.  The operating voltages of each, I'm not sure of,
and I'm not sure whether the pin out is the same, but I'm looking into it.
I have also learned that the 68000 and the 68060 (which is 33 time
faster!!!) are instructionally identical.  I am currently conceptualizing a
way to interface the 68060 with the ti-92.  The best way might be to
disconnect the stock 68000, attach ribbon cabel to the surface leads, and
run the cable out the side of the calculator.  This would allow me to bread
board the 68060 to determine what is required to interface the two.  An
easier option would be to remove the stock CPU and replace it with the 20mHz
version.  I am not sure, but I believe that there is a 25mHz and 33mHz
version out there some where, but I'm not sure on pin compatibility.  I'll
keep y'all posted.
Erik Buehler
Email me at: erikb@ksu.ksu.edu