MOTM

Note that the 80C320 is a "family" of high speed 8051 derivatives. Chances
are,
the actual part will be the 87C520. It has:

a) 16K EPROM on-chip. This is where the Keil monitor resides, and the FLASH
memory boot code.
b) extra 1K SRAM for temp. variable storage. This is *real* handy!

The actual Seq software resides in external FLASH, so we can update it using
the 2nd serial port (the
other serial port is dedicated to MIDI). The "patches" are stored in serial
EEPROM (probably a
Xicor 24C256). Hey, this is all d*****l crap! #@^$&#@$!!!

go to:

www.dalsemi.com

and get the data sheet if you are interested.

Paul S.