The Last of The Line

[Johnny Billquist]

"Jerome H. Fine" <jhfinedp3k at compsys.to> skrev:

 >>Rod Smallwood wrote:
 >> >Now that makes a lot more sense.
 >> >
 >> >So PMI memory choice is: (2 Max)
 >> >
 >> >MSV11-JD    M8637-D     1 MB ECC PDP-11/84 or PDP-11/83
 >> >MSV11-JE    M8637-E     2 MB ECC PDP-11/84 or PDP-11/83
 >> >
 > Jerome Fine replies:
 >
 > I am not absolutely positive, BUT the probability is VERY
 > high that the above two PMI memory boards are ONLY for the
 > Qbus.  I believe that you must use either the MSV11-JB or
 > the MSV11-JC within the PDP-11/84 system.

Good catch! I didn't think of that one. Yes, you're right. In fact the 
-JD and -JE don't even claim to be PMI memory, but just plain Q-bus 
memory (according to the field guide). That's definitely not useful. You 
need the -JB or -JC.

 > It is probably confusing, but the CPU is the KDJ11-BF which
 > is used in BOTH the PDP-11/83 (which I have and the memory
 > used is the MSV11-JD or the MSV11-JE) and the PDP-11/84
 > which you have.  If you can find a KDJ11-BF along with two
 > MSV11-JC PMI memory boards, the cost will likely be much
 > less than a PDP-11/94 CPU.

That is probably correct as well. The 11/9x cpu boards are scarce and 
expensive. The 11/8x cpu boards are more common and reasonably priced.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol