27 Jan
2002
27 Jan
'02
1:26 p.m.
All I have from that IBM stuff is the book
'Programing the IBM 1130'
by J.K. Hughes. What I do remember is that the logic sure used a lot
of one-shots and delay lines.
That is probably just the stuff in the drive itself. The real brain, the
2841, was (yes, probably sadly "was") a complicated microcoded box that
latched onto a channel, controlled a number of drives and drums, and
could run diagnostics offline.
Apparently 1130 systems could use 2311s with a control unit located as a
feature of the 1131. Must have been a big feature...or maybe IBM
cheapened the control unit with said one-shots, delay lines, and other
kludges, in order to cram it into the processor.
William Donzelli
aw288(a)osfn.org