was the IBM 3380/3880 (cant remember which) DASD units
of which there were 4
rows of them.
Now that I have done a bit of sniffing around, I see that you are correct
for both of your numbers - the 3880s controlled (and cached) the 3380s.
Of course, this brings up a thought: with numbers like that, I wonder how
many times the installation engineers went to the dock, only to find out
the wrong crate was shipped.
William Donzelli
william(a)ans.net