On 1/6/11 8:38 PM, Richard wrote:
Looks like
there's schematics, information about trace errors on the
board, and some experimental equations for the PALs, but apparently
the originals are lost.
PALs are simple two-level programmable logic. It shouldn't be hard to
create a truth table from the real PALs by adapting them to a PROM
reader. From there you can recreate PAL equations from the truth
table.
It's a bit tougher when they're registered and can maintain
(relatively) complex state, though. Many (most?) PALs are registered.
-Dave
--
Dave McGuire
Port Charlotte, FL