Errata

You show:
SELECT CUSTOMER-FILE ASSIGN TO "Customers.dat"

The syntax "Customers.dat" is used only on Personal Computers and not mainframes. DDNAMES are not quoted strings.

I noticed this error in several places.

Section titled Microsoft. Bill Gates did not start with a General Electric Mainframe. He started with Digital Equipment Corporation PDP-10s. See the interview with Gates here. I see I'm not allowed to post URLs. You can find information by googling.

Bill Gates Interview
NATIONAL MUSEUM
OF AMERICAN HISTORY

SMITHSONIAN INSTITUTION

The CUSTOMER DD Name in the JCL does not match CUST-FILE that is used in the previous COBOL SELECT statement. You used part of the DSN=DIV2.CUST-FILE instead, which is incorrect. Also, what is TRANFILE?

You incorrectly state that Unix was developed by MIT, AT&T, and GE. Multics was developed by the three parties mentioned, and NOT Unix. AT&T dropped out of the Multics consortium. Ken Thompson and Dennis Ritchie developed their own Operating System exclusively for AT&T. The name Unix was given as a joke. When Multics did multiple things for each problem set, Uni-ics did it one good way! Eventually, it was changed to Unix. Although Unix had some minor similarities to Multics, Multics was designed for a GE mainframe. Unix was designed for Digital Equipment Corporation for mini-computers.