MSV11-B MOS memory: Difference between revisions
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The '''MSV11-B''' (M7944) was a [[DEC card form factor|dual]]-height [[QBUS]] [[Dynamic RAM|DRAM]] [[main memory]] card. They held 8KB when fully populated with 4Kx1 DRAM [[integrated circuit|chips]]. They required external [[refresh]], typically performed by the [[LSI-11]] [[Central Processing Unit|CPU]]. | The '''MSV11-B''' (M7944) was a [[DEC card form factor|dual]]-height [[QBUS]] [[Dynamic RAM|DRAM]] [[main memory]] card. They held 8KB when fully populated with 4Kx1 DRAM [[integrated circuit|chips]]. They required external [[memory refresh]], typically performed by the [[LSI-11]] [[Central Processing Unit|CPU]]. | ||
They are [[QBUS#Variable address size|Q16]] cards (hence, could not be used in Q18 or Q22 systems, such as [[PDP-11/23]]'s with more than 64KB of memory). Their starting [[address]] is configured by use of [[jumper]]s. | They are [[QBUS#Variable address size|Q16]] cards (hence, could not be used in Q18 or Q22 systems, such as [[PDP-11/23]]'s with more than 64KB of memory). Their starting [[address]] is configured by use of [[jumper]]s. | ||
Revision as of 12:03, 22 September 2022
The MSV11-B (M7944) was a dual-height QBUS DRAM main memory card. They held 8KB when fully populated with 4Kx1 DRAM chips. They required external memory refresh, typically performed by the LSI-11 CPU.
They are Q16 cards (hence, could not be used in Q18 or Q22 systems, such as PDP-11/23's with more than 64KB of memory). Their starting address is configured by use of jumpers.
External links
- Microcomputer Handbook (1976-77) - the MSV11-B is covered on pp. 4-33—4-36 and 5-9—5-11 (pp. 116-119 and 162-164 of the PDF)
- MSV11-B Field Maintenance Print Set (MP00067)
- M7944 MSV11-B 4-Kword RAM - board images
