On 2 Jun 2008 07:32:46 -0700, [EMAIL PROTECTED] (Warren Brown) wrote:
>Actually, IBM built special hardware for this type of software to run on.
OK, it's been almost thirty years, so my memory may be a bit hazy...
Between mid 1977 and mid 1979 I worked for Continental Airlines. At
the time we were running ACP/SHARES[1] on three 360/65 and one
370/155. IIRC, these where standard boxes, with no special hardware
features supporting the ACP environment.
However, we were using 2314s attached to these boxes, and I believe
there _was_ a hardware RPQ on the drives. Called something like
"Airlines Control Buffer", I _think_ the feature allowed the drive to
disconnect from the channel while doing a seek. Whatever the details,
it was something that became standard on later mainframe drives from
IBM.
Eric
[1]: SHARES = "SHAred RESeveration" system. Prior to SHARES, there
were airlines that hosted reservation systems for other airlines by
dedicating a separate box and ACP system for each of their customers.
SHARES was originally developed by a company called Mutual Computer
Systems as an attempt to provide an ACP-based system that could host
multiple airlines on one box, with database isolation. MCS was later
purchased by Continental.
At least, this is what I was told while working for CO!
--
Eric Chevalier E-mail: [EMAIL PROTECTED]
Web: www.tulsagrammer.com
Is that call really worth your child's life? HANG UP AND DRIVE!
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