Difference between revisions of "MM11-Y core memory"
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| − | The '''MM11-Y''' was a 64 Kbyte [[core memory|core]] [[main memory]] for [[PDP-11]] [[UNIBUS]] machines. An MM11-Y was composed of two [[DEC card form factor|hex]] boards, one piggy-backed on the other, and the pair taking only a single [[backplane]] slot (electrically): | + | The '''MM11-Y''' was a 64 Kbyte [[core memory|core]] [[main memory]] for [[PDP-11]] [[UNIBUS]] machines. It provided [[parity]], so its formal name was '''MM11-YP'''. |
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| + | An MM11-Y was composed of two [[DEC card form factor|hex]] boards, one piggy-backed on the other, and the pair taking only a single [[backplane]] slot (electrically): | ||
* An H228-B daughter-board containing the cores | * An H228-B daughter-board containing the cores | ||
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The MM11-Y did not use a custom backplane; it plugged into a standard [[Modified UNIBUS Device|MUD slot]]. The pair was 'thick' enough that a normal board cannot be plugged into the next slot; instead, a [[G727 grant continuity card]] must be used there (since it has no components on it, it just clears the H228-B card). | The MM11-Y did not use a custom backplane; it plugged into a standard [[Modified UNIBUS Device|MUD slot]]. The pair was 'thick' enough that a normal board cannot be plugged into the next slot; instead, a [[G727 grant continuity card]] must be used there (since it has no components on it, it just clears the H228-B card). | ||
| − | + | The core array provided two more bits per [[word]], to support [[byte]] parity; parity operation used an [[M7850 parity controller]] plugged into the same backplane as the MM11-D. | |
It is possible to [[interleave]] a pair of MM11-Y's to provide reduced effective average [[access time]]s. | It is possible to [[interleave]] a pair of MM11-Y's to provide reduced effective average [[access time]]s. | ||
Revision as of 15:48, 1 October 2021
The MM11-Y was a 64 Kbyte core main memory for PDP-11 UNIBUS machines. It provided parity, so its formal name was MM11-YP.
An MM11-Y was composed of two hex boards, one piggy-backed on the other, and the pair taking only a single backplane slot (electrically):
- An H228-B daughter-board containing the cores
- A G657 mother-board containing most of the electronics, and the contact fingers for plugging into a backplane
The MM11-Y did not use a custom backplane; it plugged into a standard MUD slot. The pair was 'thick' enough that a normal board cannot be plugged into the next slot; instead, a G727 grant continuity card must be used there (since it has no components on it, it just clears the H228-B card).
The core array provided two more bits per word, to support byte parity; parity operation used an M7850 parity controller plugged into the same backplane as the MM11-D.
It is possible to interleave a pair of MM11-Y's to provide reduced effective average access times.
Further reading
- MM11-YP User's Manual (EK-MM1YP-UG) - not available online
- MM11-YP Technical Manual (EK-MM1YP-TM-001) - not available online, exists in fiche
External links
| 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 Other: FIS floating point • PDP-11 Commercial Instruction Set • PDP-11 stacks • PDP-11 family differences |
