MSV11-D/E MOS memory: Difference between revisions

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[[Image:M8044.jpg|150px|thumb|right|M8044 memory card]]
[[Image:M8044.jpg|150px|thumb|right|M8044 memory card]]


The '''MSV11-D''' (M8044) was a [[QBUS]] 64kb [[main memory]] card (when fully populated; it was also available in 1/4, 1/2, and 3/4 full versions), used in the [[LSI-11]] [[PDP-11]].
The '''MSV11-D''' (M8044) was a [[DEC card form factor|dual]]-height [[QBUS]] [[Dynamic RAM|DRAM]]  [[main memory]] card; the '''MSV11-E''' (M8045) is identical (apparently even using the same [[etch]] [[printed circuit board|PCB]]), but adds byte [[parity]]. They were used in the [[LSI-11]] [[PDP-11]].


{{stub}}
They held 64KB when fully populated, and were also available in 1/8, 1/4, and 1/2 sized versions. Initially they used 4Kx1 DRAM [[integrated circuit|chips]], later/larger ones used 16Kx1 DRAMs. The memory is arranged as 2 banks, each 16 data bits (one [[PDP-11]] [[word]]) wide, optionally with 2 additional bits for [[parity]] (1 per [[byte]]) in the MSV11-E.
 
Four versions of each exist:
 
* MSV11-DA, -EA - 8KB (4K DRAMs)
* MSV11-DB, -EB - 16KB (4K DRAMs)
* MSV11-DC, -EC - 32KB (16K DRAMs)
* MSV11-DD, -ED - 64KB (16K DRAMs)
 
All are [[QBUS#Variable address size|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory).
 
They had internal [[refresh]].


[[Category: QBUS Memories]]
[[Category: QBUS Memories]]

Revision as of 15:26, 2 May 2020

M8044 memory card

The MSV11-D (M8044) was a dual-height QBUS DRAM main memory card; the MSV11-E (M8045) is identical (apparently even using the same etch PCB), but adds byte parity. They were used in the LSI-11 PDP-11.

They held 64KB when fully populated, and were also available in 1/8, 1/4, and 1/2 sized versions. Initially they used 4Kx1 DRAM chips, later/larger ones used 16Kx1 DRAMs. The memory is arranged as 2 banks, each 16 data bits (one PDP-11 word) wide, optionally with 2 additional bits for parity (1 per byte) in the MSV11-E.

Four versions of each exist:

  • MSV11-DA, -EA - 8KB (4K DRAMs)
  • MSV11-DB, -EB - 16KB (4K DRAMs)
  • MSV11-DC, -EC - 32KB (16K DRAMs)
  • MSV11-DD, -ED - 64KB (16K DRAMs)

All are Q18 (hence, could not be used in Q22 systems, such as PDP-11/23's with more than 256KB of memory).

They had internal refresh.

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