22 Nov
2006
22 Nov
'06
4:01 p.m.
J Blaser wrote:
At this moment, I'm most interested in information
and documentation on the
Clearpoint Q-BUS 11B. I'd like to use this in a PDP-11/23+ or 11/73, hoping to get
Ultrix-11 or BSD2.9 running.
I have a Clearpoint QRAM-44B with 1MW, but no documentation. They look
very much the same.
Here are the jumpers I identified by trial and error:
-----
Notes on the Clearpoint Q-RAM 44B memory card
Jumpers
1 0 |
A ooo |
|
B ooo 3 |
ooo 2 |
ooo 1 |
|
C ooo b1 |
ooo b0 |
|
D ooo 1M |
ooo 512k |
ooo 256k |
|
E ooo 21 F ooo |
ooo 20 ooo |
ooo 19 ooo |
ooo 18 |
---|
|
|
----------------------
A: 18 bit Q-Bus
1 = 18bit, 0 = 22bit
B: Parity Memory CSR Address
base address is 17772100 + bit jumpers
C: Chip size select
b1: bank 1: 1 = 256k chips, 0 = 64k chips
b0: bank 0: 1 = 256k chips, 0 = 64k chips
D: Memory Size
1M: 1 = 2M, 0 = 1M
512k: 1 = 1M, 0 = 512k
256k: 1 = 512k, 0 = 256k
E: Base address
1 = adr bit, 0 = adr bit
F: ?
-----
-chuck