[rescue] looking for MVME162 ROM Images

[John Hudak]

Hi:
I don't know the specifics of the cpu board you are using but some general
comments that may help.
I think the format for the ROMs is the Mot hex format which, IRC, has  the
check some stored in the last locations of the ROM file.
Also, the EPROM programmer should have computed a CS.  Some smarter
programmers (i.e. the Data I/O) could be configured to read and compare the
CS from the downloaded ROM file.  If true in your case, you could compare
the two.
In addition, perhaps you could compare the CS computed by your programmer
to what the system board thinks it is.
I'd also try burning a new set of EPROMS.

How is the system board computing the CS comparison?
good luck.
J


On Thu, Feb 15, 2018 at 5:55 AM, Richard <ejb at trick-1.net> wrote:

> Hi All
>
> So thanks for all the replies.
>
> I have burnt a new ROM in a 27C080, modified the jumpers and made a custom
> cable as per the information at the back of one of the manuals. Success!
>
> I know have the board booting to 162-Bug> prompt.
>
> I do however get the following WARNINGS
> - ROM Checksum Error, Expected......
> - Configuration Data Failure (Invoke 'ENV' Command)
> - Board Configuration Data Failure
>
> Not sure if the ROM Checksum error is worth exploring further at this
> point...maybe when I run ENV and update config data that will go away. I am
> hypothesizing that the checksum is stored in flash and what it is comparing
> isn't the same anymore.
>
> The other two errors make sense given what has happened to the board (been
> powered off for a very long time, might have a flat timekeeper, had the ROM
> replaced, had 3 other boards removed from the chasis)
>
> now the journey begins to get a bootable OS installed and maybe find a few
> more parts like a 68040 to replace the LC, 16M mezzanine board, SCSI or CF
> Card, memory board etc...
>
> I would be interested if anyone out there is still run an MVME chassis and
> what they run on it....down stream I was thinking of getting an i860  quad
> card or some other esoteric boards....
>
> Cheers and thanks again for all the insights.
>
> Regards
>
> Richard
>
>
> On Thu, 15 Feb 2018, at 10:06 AM, David Brownlee wrote:
> > On 14 February 2018 at 22:11, Plamen Mihaylov
> > <plamenspam at afterpeople.com> wrote:
> > > Hi Richard,
> > >
> > > It's not very likely, but the garbage on serial console could be
> caused by
> > > EPROM size jumper. Bear in mind that 162-212 comes with no SCSI chip,
> LC
> > > cpu and 4MB so running BSD is not possible.
> > > Theoretically you can add VME memory board and replace the 68LC040
> with  68040.
> > > This will allow you to netboot OpenBSD or NetBSD.
> >
> > The LC040 should be able to run a soft float NetBSD (its done for some
> > mac68k models).
> >
> > 4MB *should* just about boot, though you will need swap (and patience
> > :) to do anything. If you're just looking to use it as a general
> > hardware/SCSI test then it should be enough...
> >
> > David
> > _______________________________________________
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