4 Nov
2010
4 Nov
'10
3:44 p.m.
On 4 Nov 2010 at 18:35, William Donzelli wrote:
Very few TTL chips are actually rare, so the boards
are probably more
important whole than as parts. MECL III parts (MC16xx) are getting a
little scarce, however. MECL I and II are getting very scarce, but by
1974 they were obsolete and out of fashion.
9400 series Fairchild TTL Macrologic chips are fairly uncommon, but I
don't know if this design used them.
--Chuck