[rescue] 4/110 not booting

[Michael Welle]

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.

Machine is still not working. With diag mode enabled I get the following
output:

Memory Address Test. 32-bit - Color Plane.
Video Memory 3-Pattern Test. 32-bit - Color Plane.
<Probing for Main Memory>
<Found 0x00000020 MB of Main Memory>
Limited Memory Test: End of Megabyte 0x00000020. Tests Complete.       
MMU Read Access/Modified Bits Test.
MMU Write Access/Modified Bits Test.
MMU Write To Write-Protected Page Test.
MMU Read From Write-Protected Invalid Page Test.
MMU Read From Writable Invalid Page Test.
MMU Write To Write-Protected Invalid Page Test.
MMU Write To Writable Invalid Page Test.
Main Memory Timeout Test.
Control Space Timeout Test.
Range Error Test.
Size Error Test.
Parity No Fault Test.
Parity Error Detection and Interrupt Test.
Parity Error Detection without Interrupt Test.
Cache Tag Bank Test, Alternating Bit Pairs <31:11>.
DMA Address Register Test.
DMA Byte Counter Register Test.
DMA Send and Byte Pack Register Test.
DMA Conflict Interrupt Check.
DMA From Invalid Page.

END OF SELFTEST # 0x00000001 (SELFTEST PASSED).
#PASSED = 0x00000001, #FAILED = 0x00000000

<Sizing Main Memory>
<Found 0x00000020 MB of Main Memory>
<Initializing Memory...>
<Turning Parity Checking ON>
Main Memory Test: Megabyte 0x00000020. Tests Complete.       
<Found 0x00000020 MB of Main Memory>
<Initializing Memory...>
Selftest Completed.

Type a key within 10 seconds to enter Extended Test System (e for echo mode).
e


The self test looks fine to me. But after that the machine doesn't seem
to do anything interesting anymore. Pressing e or any other key doesn't
seem to do anything. The LEDs show 10101000 (runs main memory test).

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

Any hints on that, please?

Regards
hmw