-----------------------<snip>-------------------------
The S/360 had a push button on the console labeled "External Interrupt".
I don't recall ever using it (but that would have been in 1970-71).
When generating a SA DUMP IPL test you can list a series of addresses
For the console it is to use. In this case, providing an "External
Interrupt" by pressing a key on the keyboard wakes up the SA dump
program and identifies which of the consoles is to be used for operator
interaction.
I think SAPL is a VM function. That's how interpret the wording in the
ICKDSF manual. It says see the VM/ESA Planning and Administration manual
for more info in the SAPL.
------------------------<unsnip>------------------------
IIRC, the 360 Interval Timer also created a "External" Interrupt.
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