Ted MacNEIL wrote:
IIRC, there was also a "head of string" 3350 that would act as a controller.
No, the HOS (A-unit) was required to connect to the 3880.
B-units were the next in line.
I think the last was a C-unit, but that might have been on for 3330's.
(That last part is an entry in my dimmer parts of my own memory)
<snip>
I don't know about 3350s (I was leaving FE by then so I never
worked on them), but 3330s had no "C" units, only head-of-string
and not-head-of-string units. The former housed a controller,
and had external control interface connections resembling bus and
tag channel cables. The latter had internal CTL-I connections
that were different and, of course, no controller.
(I worked on a *lot* of 3330s. We had something close to half an
acre of them in the data center.)
--
John Eells
z/OS Technical Marketing
IBM Poughkeepsie
[EMAIL PROTECTED]
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