On 12/14/06, Richard <legalize at xmission.com> wrote:
Does anyone have experience with one of these puppies?
There's one
for dirt cheap on ebay right now, item 170059136469.
I know a _little_ bit about them (we used to have a 3705 on our 4331
at Software Results, c. 1984).
Its Big. Its Blue. Its Heavy.
It is all of that.
If I'm remembering correctly, the 37x5 controllers are SNA PU Type 4
devices (the CPU is a PU Type 5, and terminal controllers like the
3274 are PU Type 2s). They are Channel Attached to the CPU and,
essentially, aggregate lots of comparatively low-speed I/O channels
and hand data (or take it) in big chunks to (from) the CPU. You
might, for example, hook a 3274 terminal controller to a 3705 (as we
did) to deploy a quantity of 3270 terminals. You might also hang a
3780 bi-sync workstation or emulator off of a sync channel of the
37x5, as we did as well.
I really only ever knew about these boxes from their standpoint on the
SNA network. I've never had to fiddle with the hardware.
If you don't have a full-on IBM mainframe-class CPU, I can't see how
you'd be able to do anything with this sort of box.
-ethan