HP Portable Plus ... until 2039?

[Dave Frederickson]

(05-09-2014 08:02 PM)Jim Horn Wrote:  Oh - if you're in need of higher speed, we found that replacing the Harris 80C86 in the Portable with an NEC V30 series CPU combined with a minor cut and jumper change to run it at 8MHz instead of 5.333MHz roughly doubled the speed of the Portable without noticeable decrease in battery life. It's a far simpler mod than the memory expansion I mentioned (which involves removing all 34 8kx8 SRAMs and replacing them with 16 32kx8 SRAMs, among other things).

Sam Chau's description of the mod can be found in this issue of The Portable Paper. I'm considering modding one of my PLUSes.

Dave