Good morning (here...)

> Ok, I've opened the box, and something looks a bit odd to me -- there is
> not an even number of memory modules in the system. The slot layout is
> as follows:

No problem, i was insure if it needs two modules at once. in that case
it doesn't.

> 
> +---Front----------------------------------------+-------------+
> |                                                |             |
> | 1 XXXXFULL-SIMM-SLOTXXX 5XXXEMPTY-SIMM-SLOTXXX |  POWER      |
> | 2 XXXXFULL-SIMM-SLOTXXX 6XXXEMPTY-SIMM-SLOTXXX |    SUPPLY   |
> | 3 XXXXFULL-SIMM-SLOTXXX 7XXXEMPTY-SIMM-SLOTXXX |             |
> | 4 XXXEMPTY-SIMM-SLOTXXX 8XXXEMPTY-SIMM-SLOTXXX |             |
> |                                                |             |
> \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
> 
> This seems suspect... shouldn't the simm installation be symmetrical?
> Also, what sort of simms do I need?  Anyone have any spares floating
> around?

I numbered the slots for you. I think the modules are 32 bit, the bus
must be 32 bit also. My VS 4000 VLC uses normal PS/2 modules from PC's,
but with parity and i think this really needs two at once. But the 3100
uses a little bit strange modules. DEC-specific. Looks like PS/2 but has
2 pins more.

> 
> Yet another tidbit... here's the TEST 50 output from the memory section:
> 
> ?? MEM      000C.0200
>       00C00000 00000000 00020002 10012440 AAAAAAAA AAAAAAAA AAA5AAAA
> AAAAAAAA

I'm not sure, but try to put the module 3 onto place 1 and leave module
1 out.
Then test again. (maybe some more times to get sure).
It it's an error, try every single module and kick out the bad one (and
hope, it's only one. 8 MB is really the minimum to efficiently boot)

Ok, i'll look in again this evening.

cu.. Michael