On Wed, 15 May 2019 20:31:55 +0000, Pommier, Rex wrote:

>The point I was making was that IBM had some DASD subsystems for large(r) 
>customers with integrated controllers

Oh. Sorry I misunderstood. Thanks for the clarification.

The s/360 POO (available on bitsavers), says, 
"A control unit may be housed separately or it may be physically 
and logically integral with the I/O device."

-- 
Tom Marchant

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