From Computer History Wiki
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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.
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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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| − | It also supported the optional [[KUV11 Writeable Control Store]].
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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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| − | 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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| − | ==ODT==
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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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| − | 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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| − | ==Links==
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| − | * [http://web.frainresearch.org:8080/projects/pdp-11/lsi-11.php LSI-11 Processors]
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| − | {{PDP-11}}
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| − | [[Category: PDP-11 Processors]]
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| − | [[Category: QBUS Processors]]
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Revision as of 18:54, 23 November 2018
