Rick Fochtman wrote:
IIRC, the 360 Interval Timer also created a "External" Interrupt.
timer, external interrupt button, and SIGP (signal processor) instruction. SIGP
was
used in multiprocessor configurations to wakeup other processors. Also something
is trying to jog my memory about write&read direct (WRD & RDD)
listed here WRD(84) and RDD(85) as privileged instructions
http://www.garlic.com/~lynn/gcard.html#11
part of the "direct control" facility. current principle of ops indicate that
WRD/RDD
didn't survive past 370
from trusty 360 princ. of ops off of bitserver
Direct Control Feature
The direct control feature provides two instructions, READ DIRECT and WRITE DIRECT, and six external interruption lines. The read and write instructions provide for the transfer of a single byte of information between an external device and the main storage of the system.
... snip ...
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