Difference between revisions of "LSI-11"

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The '''LSI-11''' was DEC's first cost-reduced [[PDP-11]] [[Central Processing Unit|CPU]], using the [[QBUS]] and the [[LSI-11 chip set‎]]. The LSI-11 is a [[DEC card form factor|quad]] board (M7264) with additional functionality on-board (making possible a single-[[printed circuit board|board]] computer).
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[[Image:LSI-11.jpg|250px|thumb|right|M7264 KD11-F board (etch revision F), with KEV11-A]]
  
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The usual CPU options were available for the LSI-11: the [[KEV11-A floating point|KEV11-A]], for the [[PDP-11 Extended Instruction Set|EIS]]/[[FIS floating point|FIS]] instructions; the [[KEV11-B Extended Instruction Set|KEV11-B]] provides EIS without FIS; the [[KEV11-C Commercial Instruction Set‎|KEV11-C]] provides a subset of the PDP-11 [[PDP-11 Commercial Instruction Set|CIS]] (it also apparently includes the EIS, but not the FIS).
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The '''LSI-11''', first shipped in the Fall of 1975, was DEC's first cost-reduced [[PDP-11]] [[Central Processing Unit|CPU]], introducing the [[QBUS]], and using the [[LSI-11 chip set]]. It was the first of the [[LSI-11 CPUs]]; it had the same QBUS limitations, and use of [[QBUS CPU ODT|ODT]] for control, as the others.
  
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The [[integrated circuit|chip]] order (from the left, with the contact finger edge down, and the component side facing the viewer) is KEV11, uROM 1, uROM 0, Control, Data Path.
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The LSI-11 is a [[DEC card form factor|quad]] board (M7264) with additional functionality on-board. They were popular in [[Original Equipment Manufacturer|OEM]] usage.
  
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It also supported the optional [[KUV11 Writeable Control Store]].  
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The usual CPU options were available for the LSI-11: the [[KEV11-A floating point|KEV11-A]], for the [[PDP-11 Extended Instruction Set|EIS]]/[[FIS floating point|FIS]] instructions; the [[KEV11-B Extended Instruction Set|KEV11-B]] provides EIS without FIS; the [[KEV11-C Commercial Instruction Set|KEV11-C]] provides a subset of the PDP-11 [[PDP-11 Commercial Instruction Set|CIS]] (it also apparently includes the EIS, but not the FIS). It also supported the optional [[KUV11 Writeable Control Store]].
  
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Several different LSI-11 models exist, including the '''KDF11-F''' and '''KDF11-H''', in numerous variants. the base KD11-F version includes 4KW of [[Metal Oxide Semiconductor|MOS]] [[Random Access Memory|RAM]]; the KD11-H version has the RAM deleted; the KD11-Q includes the KEV11-C. The '''KDF11-J''' referred to an LSI-11 sold with an [[MMV11-A QBUS core memory]] card.
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The [[integrated circuit|chip]] order (from the left, with the contact finger edge down, and the component side facing the viewer) is [[KEV11]], μROM 1, μROM 0, Control, Data Path.
  
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==ODT==
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==Variant models==
  
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They were the first PDP-11 model to not have a [[front panel]] to control them; instead, as a cost-reduction measure, when the CPU is [[halt]]ed, specialized [[microcode]] used the main [[serial line]] as a operating console. The command set is named '''Octal Debugging Technique (ODT)'''; there are commands to read and write [[main memory]], start the CPU, etc.
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Many different LSI-11 models exist, including the '''KD11-F''' and '''KD11-H''' base versions, and numerous other variants. The KD11-F version includes 4KW of [[Metal Oxide Semiconductor|MOS]] [[Random Access Memory|RAM]] on-board; the KD11-H version has the RAM deleted.
  
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The main serial interface is normally configured so that when the CPU is running, sending a [[asynchronous serial line|break]] on the console serial line halts the CPU.
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Others included various KEV11 chips pre-installed:
  
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==Links==
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* the KD11-L is a KD11-F with a KEV11-A
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* the KD11-N is a KD11-H with a KEV11-A
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* the KD11-P is a KD11-F with a KEV11-C
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* the KD11-Q is a KD11-H with a KEV11-C
  
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Some models include additional cards:
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* the KD11-J is a KD11-H sold with an [[MMV11-A QBUS core memory]] card
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* the KD11-R is a KD11-H sold with an [[MSV11-C QBUS MOS memory]] card
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==See also==
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* [[LSI-11/2]]
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==External links==
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* [http://www.bitsavers.org/pdf/dec/pdp11/1103/ -11/03] - documentation at [[Bitsavers]]
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** [http://www.bitsavers.org/pdf/dec/pdp11/1103/EK-LSI11-TM-002.pdf LSI-11, PDP-11/03 user's manual] (EK-LSI11-TM-002)
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** [http://www.bitsavers.org/pdf/dec/pdp11/1103/1103_Schematics.pdf PDP-11/03 engineering drawings] - includes all KD11 versions
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** [http://www.bitsavers.org/pdf/dec/pdp11/1103/Titelbaum_LSI-11_1975.pdf The LSI-11 - A System Microcomputer]
 
* [http://web.frainresearch.org:8080/projects/pdp-11/lsi-11.php LSI-11 Processors]
 
* [http://web.frainresearch.org:8080/projects/pdp-11/lsi-11.php LSI-11 Processors]
  
 
{{PDP-11}}
 
{{PDP-11}}
  
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[[Category: PDP-11 Processors]]
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[[Category: PDP-11 QBUS Processors]]
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[[Category: QBUS Processors]]
 

Latest revision as of 21:06, 20 December 2023

M7264 KD11-F board (etch revision F), with KEV11-A

The LSI-11, first shipped in the Fall of 1975, was DEC's first cost-reduced PDP-11 CPU, introducing the QBUS, and using the LSI-11 chip set. It was the first of the LSI-11 CPUs; it had the same QBUS limitations, and use of ODT for control, as the others.

The LSI-11 is a quad board (M7264) with additional functionality on-board. They were popular in OEM usage.

The usual CPU options were available for the LSI-11: the KEV11-A, for the EIS/FIS instructions; the KEV11-B provides EIS without FIS; the KEV11-C provides a subset of the PDP-11 CIS (it also apparently includes the EIS, but not the FIS). It also supported the optional KUV11 Writeable Control Store.

The chip order (from the left, with the contact finger edge down, and the component side facing the viewer) is KEV11, μROM 1, μROM 0, Control, Data Path.

Variant models

Many different LSI-11 models exist, including the KD11-F and KD11-H base versions, and numerous other variants. The KD11-F version includes 4KW of MOS RAM on-board; the KD11-H version has the RAM deleted.

Others included various KEV11 chips pre-installed:

  • the KD11-L is a KD11-F with a KEV11-A
  • the KD11-N is a KD11-H with a KEV11-A
  • the KD11-P is a KD11-F with a KEV11-C
  • the KD11-Q is a KD11-H with a KEV11-C

Some models include additional cards:

See also

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

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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