[Info-vax] coming soon: old DEC hardware free to a good home

[Kari Uusimäki]

John Wallace wrote:
> On Sep 22, 8:42 pm, hel... at astro.multiCLOTHESvax.de (Phillip Helbig---
> remove CLOTHES to reply) wrote:
>> In article
>> <b1b82170-e366-4060-8655-a8e9b7240... at f10g2000vbf.googlegroups.com>, H
>>
>> Vlems <hvl... at freenet.de> writes:
>>> I'd be interested in DSSI equipment,
>> I'll keep you in mind.
>>
>>> like disks and microVAX systems.
>>> IIRC a microVAX 4100 is the same as a MicroVAX 3100 with DSSI enabled
>>> instead of SCSI, right?
>> Not sure; I don't have any 4100s.
> 
> In the absence of other contributions...
> 
> There were various flavours of 3100. One of the last members of the
> 3100 family was indeed closely related to the MicroVAX 4100, indeed if
> I recall correctly the same motherboard was in both, and the (main)
> difference was indeed that the 4100 did DSSI. A "Systems and Options"
> chapter from the relevant era might reveal more.

Just to add some detail to the above answer.
The 3100 series was called MicroVAX, but the 4100 series was called VAX 
4000 model 100 (or 100A, 105A, 106A and 108).
The main system board was indeed the same on some models of MicroVAX 
3100 and VAX 4000-10*.
And like earlier said, the main difference between the two model series 
  was two SCSI buses on MicroVAX and two DSSI buses on VAX 4000-10*. The 
VAX 4000-10* had also a SCSI bus.

Kari