UNIX pc 2nd drive modifications

[John B. Milton]

In article <9056 at chinet.chi.il.us> ignatz at chinet.chi.il.us (Dave Ihnat) writes:
[...]
>Of the two available 2-disk mods (ICUS and John Milton's), the situation
>with respect to those machines which *already* have the P5.1 (large disk)
>upgrade is as follows:
>
>1)  The ICUS mod will require removal of the PAL, and modification and/or
>    addition to the jumper wires installed on the motherboard for the P5.1
>    upgrade.  Some of these wires, however, are usable as-is.
I don't know, I don't have a copy of the plans

>2)  The Milton mod will only require removal of the PAL, and insertion of
>    a daughter board.
And the ADDITION of some wires, cutting or lifting of 1 to 3 IC pins.

>(Of course, this disregards changes in the control and data cables between
>the extant drive and controller, which should be the same for both.)
No changes to the cables beyond the fact that they need to be REPLACED with
cables of the appropriate lengths.

>In this case, then, is it safe to assume that the Milton modification is the
>simplest for those who've already done the P5.1 upgrade?
I don't know. The biggest difference is that the ICUS stuff is INSTRUCTIONS. You
have you build a proto card with 5 chips on it. The mother board mods are by
definition almost identical.

John
-- 
John Bly Milton IV, jbm at uncle.UUCP, n8emr!uncle!jbm at osu-cis.cis.ohio-state.edu
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