[rescue] 4/110 not booting

Carl R. Friend crfriend at rcn.com
Sun Oct 6 09:16:03 CDT 2019

On 10/6/19 9:57 AM, Michael Welle wrote:
> Hello,
> I have this 4/110, which was in working condition when I put it into
> storage a couple of years ago. Now it doesn't boot anymore. A visual
> inspection revealed a clock quartz with rotten legs. That's interesting,
> because otherwise the machine is quite clean from the inside. I wonder
> if there is a connection to the small rubber pillow the quartz rests on?
> Anyways, I exchanged the quartz. I hope the new one will be working...
> Sticking probes anywhere on the board is complicated when the board is
> in its enclosure.


> If I start the machine with diag mode disabled the LEDs settle on
> 00101000 (SCSI/DMA test) and then nothing happens.

    Offhand, I'd suspect the disk drive.  The extended diags likely
come from disk, and the logical thing to try after finishing off
the POST is to boot -- and that's where things look like they're
hanging up.  Is the disk spinning?  Does it make any odd noises
(e.g. "clicking")?

    Good luck with it!

| Carl Richard Friend (UNIX Sysadmin)            | Boylston            |
| Minicomputer Collector / Enthusiast            | Massachusetts, USA  |
| mailto:crfriend at rcn.com                        +---------------------+
| http://users.rcn.com/crfriend/museum           | ICBM: 42:20N 71:43W |

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