"Technical Reference System Unit
IBM 7531/7532 Industrial Computer
First edition (July 1985)"
[courtesy Johan Heuseveldt [comp.sys.acorn.hardware, Sep 12 2001, 2:43 pm]]

*PN 6523261*
[lifted from "OS/390 Object Access Method Planning, Installation, and Storage Administration Guide for Object Support Release 10 SC35-0391-00"
[ http://ranch.state.nd.us/pdf/pdf/dgt1o220.pdf ]]