PDP-11/70 in Yates Center, KS

This is very true. And it's not clear how far 'A' should go if the original parts are unavailable. Some people will only accept 'genuine' parts (for example TTL chips with 1820-xxxx numbers when repairing HP machines), some will take any identical part (any '7400' no mater who made it),. some will tkae anything that will work (so a 74LS00 would be OK in place of a 7400 in some circuits), and so on. Perosnally, I want the machines to work (non-working boxen have little interest to me other than as puzzles to work out what's wrong with them :-)), and will do anything that doesn't involave major [1] permanent changes. [1] I will drill extra mounting screw holes to fit, say, a transformer of different physical dimensions, but I won't cut large holes in the case or chage the electronic design. -tony