LT1 EEPROM Programming Help

[Jeff Bromberger]

Hello, I'm new to the list so forgive me if this has been asked
before...

What are my options to reprogram the EEPROM on my '94 LT1
camaro? I'd like to change values such as fan turn-on temps,
timing advance, injector/fuel maps, etc. I don't want to use
something like the hypertech programmer, I'd prefer to do it
myself. Is the PCM proprietary hardware or is it a commonly
available uP like a motorola? 

any help would be greatly appreciated,
Jeff Bromberger
bromberger at home.com