mainframes and other stuff

William Donzelli wdonzelli at
Fri Nov 21 21:28:07 CST 2014

> Actually, IBM gear had VERY little gold in them.

Have you seen the inside of a 4381? There is a large array of
multichip modules, sort of forerunners of the air cooled TCM - each
one has almost 1000 gold plated pins.

> So, a good-sized 360 mainframe had a couple Oz. of gold, total.

The NASA model 67 reportedly had 66 ounces of gold in the CPU. Even an
early model 30 could have 8 or 9.

It is true that midway through the S/360 period and into the S/370
period, the gold was really trimmed away to save costs - thus my wide
range of values for 3803 tape controllers (they usually have a random
mix of gold and tin backplanes).


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