Massbus - was: Re: VAX 11/750

Al Kossow aek at
Thu Feb 25 14:27:36 CST 2021

On 2/25/21 10:43 AM, Chris Zach via cctalk wrote:
> Oh this is fun stuff. Is there a specification write-up anywhere on the MASSBUS overall?

there is some documentation on bitsavers

the register descriptions were intentionally obfuscated to prevent cloning
that was figured out to make SIMH work

the CDC drive interface was also slightly modified for the same purpose

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