IBM Bus & Tag channel protocol specs?
jwstephens at msm.umr.edu
Thu Apr 20 17:12:12 CDT 2006
Sridhar Ayengar wrote:
> Patrick Finnegan wrote:
for what it's worth, the P/390 only ever ran tape drives and only drove
selector channel protocol. It never ran any DASD due to protocol
limitations, and the fact that it was too slow to be useful, when emulated
storage thru the token ring ran faster.
My friend who has both versions only remembered seeing a version
of the Host version of the cards and cables for the Micro Channel
version, and not for the PCI. Univac supported the host version on
the PCI card set.
IBM systems with P/390's were more likely to be in Escon farms than
in bus / tag. The R/390's may have been more likely to be in sites with
SSA available, which IBM was pushing at the time the P/390's were
in vogue. Therefore less likely to see Escon versions of that hardware
or the Bus/Tag versions.
I don't think this is a bad idea, but I don't think that the solution exists
in a form that can be bought, even if IBM had it in some product.
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