26 Jul
2013
26 Jul
'13
3:03 p.m.
Those are the little "tin cans" that IBM
used, back in the early to mid
'70s, to enclose (encapsualte) their "medium scale integration" -- an
earlier generation, before the "LSI" (Large Scale Integration" chips
took over pretty much everything.
These were used in virtually all IBM products of that day, from
mainfames, to minicomputers, to control units, and even inside other
intelligent devices, like the disk drives and printers, etc., for the
"logic" on-board ...
As an aside, IIRC the sense amplifier circuit in the original PC and
PC/XT keybaord used one of those metal-can ICs.
-tony