PDP-11 Memory
Bill Gunshannon
bill.gunshannon at hotmail.com
Fri Jan 11 11:28:00 CST 2019
Well, it has been so long since I had to put together an
entire system I forgot what fun it can be.
With almost documentation I was able to configure 4 1meg
memory modules and I tested them all in my 11/23+ box.
KDJ11-B with 4 different (but similar) memory cards.
"MAP" option of the KDJ11 shows 4 meg (minus the I/O
Page) and all the right CSR's for the first four blocks.
Really wanted to make this a deskside so I moved the
cards to a MicroPDP box (Yes, I have a coule of the
deskside pedestals). Power on, Memory CSR error.
Move then back to the 11/23+ works fine. If I only
put the first three in the MicroPDP box it works.
But as soon as I try to put in a fourth module I
get the memory CSR error. Tried different cards
(although working in the 11/23+ box would make me
think it is not a problem with the card) no help.
Anybody care to take a stab at what might be causing
this problem?
bill
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