The Extend92 EuP Driver (v1.50)
                     By Bryan Rittmeyer <bryanr@flash.net>

Extend92 is the name of the TI-92 driver produced by the Extender uP
project. Briefly, the Extender uP is a digital 4 Mbit harddrive for
the TI series of calculators. It was designed with the TI-92 in mind;
However, because it communicates in the TI low level protocol, drivers
may be written for the TI-8X series of calculators.

The Extender uP has been built by nearly 20 people so far, and has been
working for over 4 months. This is the latest and most likely final
version of the Extender uP driver. It has a number of fixes and
enhancements over the older driver.

I have more or less taken over development of the EII from Mel Tsai,
who built the first working TI memory expander. However, I, like Mel,
have a lot of other things to do that take precedence. It may be a
while before I'm finished with design and testing. In the mean time,
I wish to bring the EuP project to a close. I will no longer be
enhancing the Extender uP. It works flawlessly already and
I would like to put some of the things that didn't make it into the
EuP into the EII. Mel Tsai is working on TI-85 drivers for the EuP --
any questions or comments about those drivers should go to him. I am
only responsible for Extend92.

You can contact Mel Tsai at tsaimelv@pilot.msu.edu or
http://www.egr.msu.edu/~tsaimelv/expander.htm

Thanks for your interest and make sure you check the website at
http://www.flash.net/~bryanr/extend/ I posted the final version of
the EuP schematic, with the regulator correction and addition of the
busy and power LEDs. Looks like that's all folks. It's been a blast.

Bryan Rittmeyer
bryanr@flash.net
1/2/98