Hardware Components Software Running Unix

Memory

The memory I chose for my PDP-11 is a Camintonn CMV-504 dynamic RAM module. Genuine DEC memory modules, with more than 256 KB onboard, are difficult to find and much more expensive than third-party modules. Configuration information on non-DEC modules, however, can be difficult to find.

The CMV-504, shown below, packs 2 MB of RAM on a dual width board. This should be more than adequate for my needs.

CMV-504

The configuration information below is what I know about the dual-width Camintonn modules. It applies to the following part numbers:

Note: Most of the the jumper identifiers on the module are in very small print, making them difficult to find.

Starting Address: Jumpers 1-9, 15, 16

Update Starting Address Increment: 8K 16K 32K 64K 128K 256K 512K 1024K 2048K

Starting Address in 256K Increments
Address 1 2 3 4 5 6 7 8 9 15 16
I = INSTALLED; R = REMOVED
0 KB I I I I I I I I I I R
256 KB I I I I I R R R R R I
512 KB I I I I I I R R R R I
768 KB I I I I I R I R R R I
1024 KB I I I I I I I R R R I
1280 KB I I I I I R R I R R I
1536 KB I I I I I I R I R R I
1792 KB I I I I I R I I R R I
2048 KB I I I I I I I I R R I
2304 KB I I I I I R R R I R I
2560 KB I I I I I I R R I R I
2816 KB I I I I I R I R I R I
3072 KB I I I I I I I R I R I
3328 KB I I I I I R R I I R I
3584 KB I I I I I I R I I R I
3840 KB I I I I I R I I I R I

Ending Address: Jumpers 10-14

Update Ending Address Increment: 128K 256K 512K 1024K 2048K

Ending Address in 512K Increments
Address 10 11 12 13 14
I = INSTALLED; R = REMOVED
512 KB I I R R R
1024 KB I I I R R
1536 KB I I R I R
2048 KB I I I I R
2560 KB I I R R I
3072 KB I I I R I
3584 KB I I R I I
4096 KB I I I I I

18-bit CSR: Jumper "A" installed.
22-bit CSR: Jumper "B" installed.

CSR Parity Enabled:  Jumper "C" installed.
CSR Parity Disabled: Jumper "D" installed.

CSR Address
Address G H J
17772100 I I I
17772102 I I R
17772104 I R I
17772106 I R R
17772110 R I I
17772112 R I R
17772114 R R I
17772116 R R R

4KW I/O Page Size: Jumper "K" installed.
2KW I/O Page Size: Jumper "L" installed.

Block Mode DMA Disabled: Jumper "S" installed.
Block Mode DMA Enabled:  Jumper "T" installed.

References


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