Massbus - was: Re: VAX 11/750

Paul Koning paulkoning at
Thu Feb 25 12:56:27 CST 2021

> On Feb 25, 2021, at 1:43 PM, Chris Zach via cctalk <cctalk at> 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.


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