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From: anneser@pwa-b.UUCP (Dean Anneser)
Newsgroups: comp.sys.dec,comp.sys.ibm.pc
Subject: PDP-11 (QBus) <-> IBM PC (AT) bus adapter
Keywords: QBus, AT Bus, adapter
Message-ID: <301@pwa-b.UUCP>
Date: 4 Apr 89 12:44:09 GMT
Followup-To: poster
Organization: Pratt & Whitney Aircraft, E. Hartford, CT
Lines: 23

I am posting this for a friend:

I would be interested in hearing from anyone who has used an IBM PC/AT to
DEC Q-22 bus adapter from BIT 3 Corporation.  We have been trying to con-
nect an IBM PC/AT to a DEC PDP-11/23 or /73.  In particular, we have chosen
to use the 128k bytes of dual-port RAM, which comes as an option on the
adapter, as the only memory on the QBus.  The problem comes when we try to 
run DEC's RT-11 operating system.  The system gives the appearance of
booting normally, however KMON does not recognize any commands that are
entered.  BIT 3 Corporation says that they test the hardware in both the
PDP-11 and the VAX machines, but they do not use the RT-11 operating system.
On the surface, they do not see any problem with useing the dual-port RAM
as the only memory on the QBus, but they can offer nothing beyond that.

Any suggestions will be greatly appreciated.



-- 
Dean W. Anneser		  Pratt & Whitney Aircraft	"Whenever possible,
Sr. Sys. S/W Specialist	  400 Main St.			 it is best to eschew
m.s. 161-05		  East Hartford, CT  06108	 obfuscation."
{philabs,utah-gr}!pwa-b!anneser