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IBM 3720 Models 1,2,11, and 12
IBM 3721 Models 1 and 2
System/370, 30xx, 4300,
and 9370 Processors
Publication Number File Number
Third Edition (July 1988)
This major revision replaces and obsoletes GA33-0066-1.
Changes or additions to the text and illustrations are indicated by a vertical line to the left of the change.
The only major change in this revision is the insertion of a new Chapter 18, which describes 'Disk IPL
Reference in this publication to IBM products, programs, or services does not imply that IBM intends to
make these available in all countries in which IBM operates. Any reference to an IBM licensed program in
this publication is not intended to state or imp|