On Wed, Oct 20, 2010 at 1:10 PM, Arthur Chance <free...@qeng-ho.org> wrote: > On 10/20/10 20:46, Bob Hall wrote: > Getting back to reality, although I never did it (fortunately), a friend of > mine who was about a decade older than me (I'm mid/late 50s) had the > experience of programming microcode on a machine by inserting brass slugs > for 0s and ferrite slugs for 1s on a pin board. Anyone got any idea what > that was? He was (UK) military so maybe it wasn't a generally known box.
Don't know about that one, but some early desktop calculators (and I think some early computerized phone switching systems) used etched PC boards as ROM. The HP 9100 had 32K of ROM on a 16-layer PC board using this method. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
