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SubjectRe: IBM mainframe
Ah yes, the old IPL switch... quite an advance
over memorizing the octal machine code of
the bootstrap loader and toggling it in on
the front panel switches.

I got really fast on bringing up a PDP-8 :-)

IIRC, the 360/370 family has a complete other
assembly code for programming the I/O Channel,
separate from BAL-360 code.


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