> On Jul 12, 2022, at 3:48 PM, Chris Zach via cctalk <cctalk@classiccmp.org>
> wrote:
>
>> Recently eBay seller smhelectronics261 posted a very interesting prototype
>> board: https://www.ebay.com/itm/295087630609
>> The description is "Dec Digital PRO 350/380 Professional Microvax II Proto
>> 54-16707 Collectors", and the board art mentions "MICROVAX SOFTCARD."
>
> Well, that is a weird concept. Maybe they were gunning to make the absolutely
> slowest Vax system ever, the MV1 just wasn't enough of a challenge....
>
>> Does anyone know anything about this card? Especially curious is the
>> daughtercard connector: is it just for RAM expansion or is the daughtercard
>> necessary for card operation?
>
> Daughtercard almost looks like a Pro memory board, but those were 16 bit and
> only 256kw in size if I recall. That's can't be enough to do anything useful.
The standard ones, yes, but the connector and address wires supported up to a
MW per board, perhaps even 2. It's mentioned in the Pro technical manual. I
thought about building such a beast, never did.
paul
