Difference between revisions of "MM11-E and MM1-F core memories"

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The '''MM11-E''' and '''MM11-F core memories''' were [[UNIBUS]] [[main memory]] units; the first UNIBUS memory produced by [[Digital Equipment Corporation|DEC]]. They came out with the first [[PDP-11]], the [[PDP-11/20]]. They were both 4K [[word]] (8K [[byte]]s), and had an access time of 500 nsec and a cycle time of 1.2 μsec.
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The '''MM11-E''' and '''MM11-F core memories''' were [[UNIBUS]] [[main memory]] units; the first UNIBUS memories produced by [[Digital Equipment Corporation|DEC]]. They came out with the first [[PDP-11]], the [[PDP-11/20]].
  
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They consisted of a [[DEC card form factor|quad]] H207 [[core memory|core plane]] board, along with a number of dual and single cards, plugged into a quad [[system unit]]. The MM11-F was almost identical to the MM11-E, differing only in one card.
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They were very similar - both 4K [[word]] (8K [[byte]]s); the MM11-F was capable of [[interleaving]], and also had a [[parity]] version available, the '''MM11-FP''' (which used a 4kx18 [[core memory|core plane]] instead of the 4Kx16 used in the MM11-E and MM11-F).
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The MM11-F was also slightly faster: the MM11-E had an access time of 500 nsec and a cycle time of 1.2 μsec; the MM11-F had an access time of 400 nsec and a cycle time of 980 nsec.
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They consisted of a [[DEC card form factor|quad]] H207 (non-parity) or H210 (parity) core plane board, along with a number of dual and single cards, plugged into a quad [[system unit]]. The MM11-F and MM11-FP used the same backplane; only the board set was different
  
 
==Board locations==
 
==Board locations==
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| A || rowspan="2" style="text-align:center;" | UNIBUS<br>Out || Power || &nbsp; || rowspan="2" style="text-align:center;" | UNIBUS<br>In
 
| A || rowspan="2" style="text-align:center;" | UNIBUS<br>Out || Power || &nbsp; || rowspan="2" style="text-align:center;" | UNIBUS<br>In
 
|-
 
|-
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| B || &nbsp; || M109@
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| B || G225% || M109!
 
|-
 
|-
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| C || rowspan="4" style="text-align:center;" | H207 || G226 || G226 || rowspan="2" style="text-align:center;" | G729
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| C || rowspan="4" style="text-align:center;" | H207<br>or<br>H210 || G226 || G226 || rowspan="2" style="text-align:center;" | G729@<br>or<br>H7290%
 
|-
 
|-
 
| D || G102 || G102
 
| D || G102 || G102
 
|-
 
|-
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| E || G102 || G102 || G225
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| E || G102 || G102 || ++
 
|-
 
|-
 
| F || G226 || G226 || G103  
 
| F || G226 || G226 || G103  
 
|}
 
|}
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++ = G225 (MM11-E) or G108 (MM11-FP)<br>
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@ = MM11-E only<br>
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% = MM11-F only<br>
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! = Possibly the later M1091
  
 
{{PDP-11}}
 
{{PDP-11}}

Revision as of 03:43, 29 May 2018

The MM11-E and MM11-F core memories were UNIBUS main memory units; the first UNIBUS memories produced by DEC. They came out with the first PDP-11, the PDP-11/20.

They were very similar - both 4K word (8K bytes); the MM11-F was capable of interleaving, and also had a parity version available, the MM11-FP (which used a 4kx18 core plane instead of the 4Kx16 used in the MM11-E and MM11-F).

The MM11-F was also slightly faster: the MM11-E had an access time of 500 nsec and a cycle time of 1.2 μsec; the MM11-F had an access time of 400 nsec and a cycle time of 980 nsec.

They consisted of a quad H207 (non-parity) or H210 (parity) core plane board, along with a number of dual and single cards, plugged into a quad system unit. The MM11-F and MM11-FP used the same backplane; only the board set was different

Board locations

These are the board locations for the MM11-E and F (as seen from the board side) of the backplane:

Connector Slot 4 Slot 3 Slot 2 Slot 1
A UNIBUS
Out 		Power   UNIBUS
In
B G225% M109!
C H207
or
H210 		G226 G226 G729@
or
H7290%
D G102 G102
E G102 G102 ++
F G226 G226 G103

++ = G225 (MM11-E) or G108 (MM11-FP)
@ = MM11-E only
% = MM11-F only
! = Possibly the later M1091


v • d • e PDP-11 Computers and Peripherals
UNIBUS PDP-11s - PDP-11/20 • PDP-11/15 • PDP-11/35 • PDP-11/40 • PDP-11/45 • PDP-11/50 • PDP-11/55 • PDP-11/70
PDP-11/05 • PDP-11/10 • PDP-11/04 • PDP-11/34 • PDP-11/60 • PDP-11/44 • PDP-11/24 • PDP-11/84 • PDP-11/94

QBUS PDP-11s - PDP-11/03 • PDP-11/23 • PDP-11/23+ • MicroPDP-11/73 • MicroPDP-11/53 • MicroPDP-11/83 • MicroPDP-11/93

QBUS CPUs: LSI-11 • LSI-11/2 • KDF11-A • KDF11-B • KDJ11-A • KDJ11-B • KDJ11-D • KDJ11-E

Buses: UNIBUS • UNIBUS map • SPC • MUD • EUB • QBUS • CD interconnect • PMI

Also: PDP-11 architecture • PDP-11 Extended Instruction Set • FP11 floating point • PDP-11 Memory Management

UNIBUS CPUs: KA11 • KC11 • KB11-A • KB11-B • KB11-C • KB11-D • KD11-A • KD11-B • KD11-D • KD11-E • KD11-EA • KD11-K • KD11-Z • KDF11-U

Co-processors: FP11-A • FP11-B • FP11-C • FP11-E • FP11-F • KE44-A • FPF11

Chips: LSI-11 • KEV11-A • KEV11-B • KEV11-C • F-11 • KEF11-A • KTF11-A • T-11 • J-11 • FPJ11

CPU options: KE11-E • KE11-F • KJ11-A • KT11-C • KT11-D • KK11-A • KK11-B • KT24 • KTJ11-B

Rare CPU options: KS11 Memory Protection and Relocation option • KT11-B Paging Option • KUV11 Writeable Control Store

Front panels: KY11-A • KY11-D • KY11-J • KY11-LA • KY11-LB • KY11-P

More on buses: UNIBUS and QBUS termination • Bus Arbitration on the Unibus and QBUS • CTI BUS

PDT-11s - PDT-11/110 • PDT-11/130 • PDT-11/150   CTI PDP-11s - PRO-325 • PRO-350 • PRO-380

Clones: CM 1420 • SM 1420

Other: FIS floating point • PDP-11 Commercial Instruction Set • PDP-11 stacks • PDP-11 family differences

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