Hans Pufal <hans1(a)filan00.grenoble.hp.com> writes: Thanks. Maybe this was a popular thing to do in the mid-1980s? The undergraduate computer architecture course (1983 I think, maybe 1984) I took basically went from gates to a PDP-8-like CPU over the course of the semester. Somewhere at the beginning I think we spent a half-hour on the fact that there are different logic families, but we never touched on that again. (This was a Computer Science course, Real Hardware seemed to be the province of the Electrical Engineering department.) By manuals only I'm afraid, and I spent more time fascinated by the possibilities of user-developed microcode in the 2100A. The 2116A is entirely hardwired, with two accumulators, 16-bit word, 32KW memory I think. Oh, and stable across the same environmental conditions as other HP instrumentation. I suggest you webulate over to www.chac.org and look for the plain-text versions of Engine 2.3 and 2.4. You want to read the interviews with Barney Oliver and Joe Schoendorf in those issues. -Frank McConnell