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This reference summary is a minor revision and does not obsolete the previous edition. Changes include the addition of some new DASD and 3203 printer commands, the EBCDIC control characters GE and RLF and minor editoral revisions.
From a post on IBM-Main by Neil Stenlake on 12 November 1998The first Reference Summary that is a booklet instead of a card
From a post on IBM-Main by Neil Stenlake on 12 November 1998
The title for GX20-0157-0 was arranged like this: System/370Someone noticed that if you read the first letter of the title, it spelled "SEARS" - henceforth it was called the SEARS card.
Extended
Architecture
Reference
Summary
Thanks to Carl Youngren for sending me this explanation of the SEARS card.Subsequent printings found the title arranged differently like GX20-0157-1:
System/370 Extended Architecture Reference Summary