Tiny85's are $1.29 at digikey, while 555's are only $0.49, but that doesn't include the additional passives that are required to configure the 555.
SILLIAC was a large machine which generated a lot of heat; as a result it required a serious heat exchange system - one unit on each end of the machine. The cold side of the heat exchange provided a very useful chiller which held six bottles of beer!
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