MSV11-R memory module
The MSV11-R (M7458) is a quad-height QBUS/PMI DRAM main memory card.
NOTE: As a PMI card, it uses the CD interconnect; it can therefore only be plugged into a Q/CD backplane. Plugging an MSV11-R card into a regular Q/Q backplane will damage the MSV11-R.
The MSV111-RA (M7358-A) holds 1 MByte when fully populated with 256K DRAMs chips. The memory is arranged as 2 banks, each 16 data bits (1 PDP-11 word) wide, with 2 additional bits for parity (1 per byte). It is a Q22 card.
Configuration
A single 8-position DIP switch configures the card:
- Switches S1-S2 select the 22-bit starting address;
- Switches S3-S4 must always be OFF;
- Switches S5-S8 select the CSR address.
S1 | S2 | Staring Address |
---|---|---|
OFF | OFF | 00000000 (0 MB) |
OFF | ON | 04000000 (1 MB) |
ON | OFF | 10000000 (2 MB) |
ON | ON | 14000000 (3 MB) |
Control Register
Each board has a single control register, which can be configured in the range 17772100-17772136.
S5 | S6 | S7 | S8 | CSR Address |
---|---|---|---|---|
ON | ON | ON | ON | 17772100 |
ON | ON | ON | OFF | 17772102 |
ON | ON | OFF | ON | 17772104 |
ON | ON | OFF | OFF | 17772106 |
ON | OFF | ON | ON | 17772110 |
ON | OFF | ON | OFF | 17772112 |
ON | OFF | OFF | ON | 17772114 |
ON | OFF | OFF | OFF | 17772116 |
OFF | ON | ON | ON | 17772120 |
OFF | ON | ON | OFF | 17772122 |
OFF | ON | OFF | ON | 17772124 |
OFF | ON | OFF | OFF | 17772126 |
OFF | OFF | ON | ON | 17772130 |
OFF | OFF | ON | OFF | 17772132 |
OFF | OFF | OFF | ON | 17772134 |
OFF | OFF | OFF | OFF | 17772136 |
Technical information
As far as is known, there are no copies of the engineering drawings extant for the MSV11-R. The following 256K DRAM chips have been observed to be used: MB81256-15 (Fujitsu).
Further reading
- MSV11-R User Guide, EK-MSV1R-UG
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