Subject: Re: tftp boot
To: Ted Lemon <mellon@hoffman.vix.com>
From: Jonathan Stone <jonathan@DSG.Stanford.EDU>
List: port-pmax
Date: 07/05/1997 15:45:11
On Sat, 05 Jul 1997 14:09:16 -0700,
   Ted Lemon <mellon@hoffman.vix.com> writes:


>Jonathan, FYI, the PROM in the 5000/25 is more recent than the one in
>the 5000/200, and about the same era as the one in the 5000/240.
>
>                               _MelloN_

hi Ted,

I know that using the order the PROMS were designed and shipped, the
5000/200 PROMs are older than the PROMs in ioasic machines.  

But there was a mandatory FCO (a free upgrade, if I got the term
wrong) for some PROMs, principally to make them boot from CD-rom
devices (the rrz42, maybe).  I'm pretty certain the upgrade was to the
5000/200 PROMs.  (If I remember correctly, the upgrade partially broke
MOP booting, also.) That's what I meant by `newer'.

The upgrade might actually have been for the 5000/240 PROM,
but I don't think so.

I did a bunch of hacking while getting the bootblocks to work; as far
as I recall the 5000/200 can emulate the callback interface to the
3100 PROM, which none of the ioasic-based machines i had access to
could do. In that sense the design of 5000/25 and 5000/240 PROMs are
definitely newer than the 5000/200.