Massbus - was: Re: VAX 11/750

[Paul Koning]

> On Feb 25, 2021, at 1:43 PM, Chris Zach via cctalk <cctalk at classiccmp.org> wrote:
> 
> Oh this is fun stuff. Is there a specification write-up anywhere on the MASSBUS overall?
> 
> For example I wonder if the RH70 could do a transfer >128kb at a time.  ...

I don't know the answer to most of your questions, but this one is easy: "no".  The reason is that the transfer is controlled by a 16 bit word count register.

	paul