"totii@est.is" "Thordur Ivarsson" wrote:

>The mainboard (board 1) does contain 2 SCSI controllers ((or ? Wide SCSI
>controller), as far I know, standard SCSI devices can be connected to
>Wide SCSI), on the top of motherboard is connected daughter board (board

The MicroVAX 3100 10e/20e was out before Wide SCSI existed ... it is SCSI-1.

>2)that adds 8 terminal connections and Synchronus serial port. Above
>those 2 is the third board (board 3) on device shelf.

Sounds like (board 2) is a DHW42 (8 serial lines) or maybe a DSH32 (one or two 
synchronous lines). If you post the 54-xxxxx-xx part numbers I can compare with 
mine and let you know (although I think that by the time you have taken enough 
apart to see the part number you can also probably see DHW or DSH stamped 
somewhere anyway).

>
>The (board 3) is connected to (board 1) with 100 pin header cable (I
>Belive SCSI), and also connects to (board 2) with 68 pin header cable.
>The (board 2) is connected to (board 1) with 2 40pin connectors that
>match positions.

I'm guessing that (board 3) is stuck to the back of the box and is the I/O 
module (I don't know the correct designation). If it is, it's just a bunch of 
drivers for the various connections it sports.


Antonio

Antonio Carlini                            Mail: carlini@marvin.enet.dec.com
DECnet-Plus for OpenVMS Engineering
Digital Equipment Corporation              Worton Grange, Reading, England