HP Portable Plus ... until 2039?

[Jim Horn]

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).