PDP11 non-rotating memory disk

From: Bill Pechter <pechter_at_pechter.dyndns.org>
Date: Sat Feb 3 17:46:06 2001

> Nonrotataing didks for PDP-11s are really old news, seems EMC
> and AMPEX were names I remember.
> Allison

Actually, the slickest box I had was the ML-11 (a box of MK11 with
a disk controller that sat on the massbus and looked like and RS04 (I

It used semi-good MK11 cards and had battery-backed up memory and NVRAM
-- which held the "bad sector" information which the diags would record
when formatting the memory.

This made it pretty impervious to the single and double bit error problems
which MK could occasionally spit.

Repeat bad memory could be formatted out and revectored -- IIRC.

bpechter_at_monmouth.com    | FreeBSD since 1.0.2, Linux since 0.99.10  
Brainbench MVP           | Unix Sys Admin since Sys V/BSD 4.2
Unix Sys.Admin.          | Windows System Administration: "Magical Misery Tour"
Received on Sat Feb 03 2001 - 17:46:06 GMT

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