On Thu, Feb 25, 2021 at 12:27 PM Al Kossow via cctalk <cctalk@classiccmp.org> wrote:
> 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 > Interesting... Is this obfuscation documented anywhere (beyond looking at SIMH code?) I was working on an RH11/RPxx emulation for the Unibone that was partially working (and that I should really get back to...) - Josh > > the CDC drive interface was also slightly modified for the same purpose >
