Re: origin of CHAIN

[afvaiv <afvaiv@xxxxxxxxxx>]

IMHO,
in the OLD times (I joined IBM in 1968...) with first RPG language (used in 
S/360
Models 20 and 25) there was no CHAIN OpCode, but instead you could "chain"
(link?) a detail record to its "parent master" (say, for a detail order line,
search ItemNo into ItemMaster file...) via special coding using "chaining
fields"" named C1, C2, etc. RPG evolution soon brought "random access by key" as
we know it ever since, but I guess the name of the OpCode, CHAIN, was given "in
loyalty" to former Cx "chaining fields"...
Regards,

James David Rich escribió:

> My co-worker today had an interesting (and on topic!) question:  Where did
> CHAIN originate?  In the RPG manual chain is listed as retrieve random
> record.  We couldn't figure out how that translates to sound like chain.
> It sounds like the opcode should have been RTVREC or something.  Anyone
> know the history?
>
> James Rich
> james@eaerich.com
>
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-------------------------
Antonio Fernandez-Vicenti
afvaiv@wanadoo.es


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