Difference between revisions of "MS11-L MOS memory"

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The [[access time]] is 385 nsec (typical; 1025 nsec maximum on [[refresh]] conflict), and the [[cycle time]] is 510 nsec (1050 nsec maximum on refresh conflict). Refresh time is 570 nsec (typical; 610 nsec maximum); the time for a complete refresh pass is 14.5 μsec (typical), 13.5 μsec (minimum).
 
The [[access time]] is 385 nsec (typical; 1025 nsec maximum on [[refresh]] conflict), and the [[cycle time]] is 510 nsec (1050 nsec maximum on refresh conflict). Refresh time is 570 nsec (typical; 610 nsec maximum); the time for a complete refresh pass is 14.5 μsec (typical), 13.5 μsec (minimum).
  
The board has provision to use battery backup power to retain data during a power outage. Configuration is by [[Dual Inline Package|DIP]] switches.
+
It can use ''either'' +/-15V or +/12V to power the memory chips (in some MUD slots, the 15V pins provide 12V). The board has provision to use battery backup power to retain data during a power outage. Configuration is by [[Dual Inline Package|DIP]] switches.
  
 
{{PDP-11}}
 
{{PDP-11}}

Revision as of 15:18, 22 January 2020

The MS11-L was final UNIBUS main memory from DEC; a single card can hold enough MOS DRAM chips to fill the entire UNIBUS address space. It had a jumper option to enable use on an Extended UNIBUS.

Fully populated with 16Kx1 chips, it is known as the MS11-LD, and holds 256K bytes. The quarter-, half- and three-quarter-populated versions are the MS11-LA, -LB and -LC, respectively; with 64KB, 128KB and 192KB. All versions include on-board parity support.

It plugs into a MUD backplane (only; not SPC). It is a single hex card, the M7891, so it cannot go in the end slots of the backplane.

The access time is 385 nsec (typical; 1025 nsec maximum on refresh conflict), and the cycle time is 510 nsec (1050 nsec maximum on refresh conflict). Refresh time is 570 nsec (typical; 610 nsec maximum); the time for a complete refresh pass is 14.5 μsec (typical), 13.5 μsec (minimum).

It can use either +/-15V or +/12V to power the memory chips (in some MUD slots, the 15V pins provide 12V). The board has provision to use battery backup power to retain data during a power outage. Configuration is by DIP switches.