<Take that 800 mA pulse, and multiply it by the length of all the wires
<hooked to each drive line. What you end up with is a rather good radiator
<of high-frequency hash! Many machines housed the entire core assembly,
<including drivers, in a different box than the CPU for this reason.
<PDP-8/E's and -8/F's, where the memory does sit in the CPU box, have a
<special shielding card that segregates the memory from the rest of cards
<to keep this hash out of the CPU circuitry.
also to keep out of local TVs. Some of the core systems were boxed to keep
a constant temperature as ferrites are temerature sensitive.
Allison
Received on Fri Nov 21 1997 - 22:35:37 GMT