[Info-vax] RB730 Integrated Disk Controller (R80/RL02) usable with VAX-11/750?

[Bob Koehler]

In article <ipo238$id3$1 at Iltempo.Update.UU.SE>, Johnny Billquist <bqt at softjar.se> writes:
> 
> What??? Are you sure? The Unibus only have 18 address lines, which means 
> 256K addressable. And some of that is needed for I/O. I would be very 
> surprised if memory really sat on the Unibus.

   IIRC, the 730 and 725 were true UNIBUS systems, using the UNIBUS
   as the system bus, with all its limitations, just like my PDP-11/34 
   and 11/44.

   With virtual memory, who needs more than 265KB?  (These systems
   were not meant to be fast, real word processing doesn't need
   much.)