Hi All,
This was (in 1976/77) a procedure where various front panel toggle
switched were toggled, and a button was pushed. This caused the machine panel
lights to flash in a pattern. It was called "rippling core" and was to
invalidate any data left prior to IPL'ing the machine with a different
environment.
Thanks!
BobL
-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of
Seymour J Metz
Sent: Monday, July 22, 2019 1:16 PM
To: [email protected]
Subject: [EXT] Re: Friday!
I don't remember a ripple button, but I recall a clear button and a ripple CE
utility. The ripple utility was designed to test core, not just clear it. I
don't recall whether IBM ever wrote anything to test semiconductor memory.
--
Shmuel (Seymour J.) Metz
https://urldefense.proofpoint.com/v2/url?u=http-3A__mason.gmu.edu_-7Esmetz3&d=DwIGaQ&c=MWFkEADu9ctt4KEmLIuwsQ&r=2NwYDhbHSLSk8Y20BtkXqDR04_yd_pXjwSDkT22AeGs&m=DyZI9PAbjp-Jv_6AN6q70ot6xwuznLn1i3lj-6DbIug&s=fbIA8ocxvU6YgnBI0lUtldBrPw-V-LQkAtgkzkwpZwc&e=
________________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of
Lester, Bob <[email protected]>
Sent: Friday, July 19, 2019 6:16 PM
To: [email protected]
Subject: Friday!
Hi All,
Who remembers how to "ripple core" on a 360/75J? Back in the day, I was
taught that it "wrote un-digit zeros" to all storage locations (main + LCS) on
the box. If course, an IPL was required after this was done.
Not sure how widely it was used. A simple yes or no is OK if you cannot
provide details. 😊
Thanks!
BobL
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