> From: Jörg Hoppe
> did DEC construct 18bit mutants for a few PDP-11 peripherals to run
> them in KS10?
Yes and no. There were two 18-bit UNIBUS devices, but they were originally
done for the PDP-15 (DEC's last 18-bit machine). They were the RK11-E and the
RH11-AB. When the KS10 appe
> maybe the two can be jumpered together (the way the two UNIBI in the
> KD11-A/D can).
Actually, now that I think about it, that might be the reason for the order
of the UNIBUS A out B in/out slots in the backplane:
https://gunkies.org/wiki/RH11_MASSBUS_controller#Backplane_layout
One
I *think* (and this is putting the wayback hat on) that the RH11
originally was the controller for the RS03 and RS04 fixed head disk
drives. The dual Unibus was so you could put them on Unibus A for
talking to the 11/45's main bus with data transfers ripping across
Unibus B directly to the dual
