View source for CADR

[[Image:CADRmachine.jpg|thumb|right|200px|A CADR]]

The '''CADR''' was the first successful [[LISP machine]], built by the [[MIT Artificial Intelligence Laboratory|MIT AI Lab]] as a follow-on to the prototype [[CONS]] machine. Production apparently started in 1978; as of December, 1978, four were operational.

Physically, the [[microcode]]d [[Central Processing Unit|CPU]] was a single huge [[wire-wrap]] swing-out bay mounted in the front of an [[H960 rack]]. A separate [[backplane]] held [[main memory]] cards, [[input/output|I/O]] cards, etc.

Many were produced by the AI Lab; several startups (including [[Symbolics]] and [[LMI]]) produced direct descendants.

[[Image:Knight-keyboard.png|thumb|left|150px|The Knight keyboard was used with the MIT-AI [[Incompatible Timesharing System|ITS]] machine and CADRs; this is a rendition of the layout]]
   
<br clear=all>

{{semi-stub}}

==External links==

* [http://www.unlambda.com/cadr/aimemo528_75pgs.pdf CADR] - AI Memo 528
* [http://bitsavers.org/pdf/mit/cadr/ CADR] - [[Bitsavers]]
* [https://github.com/hanshuebner/cadr2/tree/master/mit cadr2/mit/] - much MIT CADR material
* [http://www.unlambda.com/index.php?n=Main.Cadr Retrocomputing - MIT CADR Lisp Machines] - includes emulator, complete sources, and bootable disk images
* [https://tumbleweed.nu/lm-3/ LM-3 --- resurrecting the MIT CADR] - contains much interesting historical material, as well as current simulation work
** Tom Knight, [https://tumbleweed.nu/r/lm-3/uv/knight-thesis.html Implementation of a List Processing Machine], January, 1979 - Knight's Masters thesis; covers the hardware and the macroprocessor which the standard microcode implements <!-- https://dspace.mit.edu/handle/1721.1/16033 -->
** [https://tumbleweed.nu/lm-3/history.html Lisp Machine System Release History]
** [https://tumbleweed.nu/lm-3/lmman-editions.html Lisp Machine Manual Editions]
* [https://onlineonly.christies.com/s/firsts-history-computing-paul-g-allen-collection/cadr-lisp-machine-138/230076 CADR LISP machine] - from [[Paul Allen]]'s collection at the [[Living Computer Museum|LCM]], includes several images
* Images
** [http://www.stupi.se/Bilder/pdp-10/jpg1/dscn2952.jpg CPU backplane]
** [http://www.stupi.se/Bilder/pdp-10/jpg1/dscn2945.jpg I/O box]
** [https://www.computerhistory.org/collections/catalog/102803888/search/acquisition-number:2022.0073/ CADR Tester Close Up at MIT AI Lab]

[[Category: Workstations]]