(this is mostly historical question)
I'm trying to understand the role of old boxes in DASD connectivity.
From IODF/HCD point of view we have
CPC-channels-CU-some_cable-DEVice
Nowadays in real world we have
CPC-ficon-DASDbox
and DASDbox is both CU+DEV (emulated).
In the old days there was a Storage Control Unit, i.e. 3830 and disk
controller within disk cabinet, i.e. 3350-A2
So, we have CPC-cable1-3830-cable2-3350A2controller-internal_cable3-disk.
I'm trying to understand separation of duties between 3830 and 3350A2
controller.
What was defined as CU - it was 3830 or controller within 3350 cabinet?
Which cable was a channel (Bus&Tag)? I guess it is "cable1" connecting
CPC and 3830.
Not to mention that some old reference manual's diagram shows yet
another box between CPC and 3830 SCU.
--
Radoslaw Skorupka
Lodz, Poland
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