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This scientific computer had characteristics which were incredible. It had a 170 MB hard disk, when other computers used 10 MB hard disks!

It was designed to make CAD or artificial intelligence applications. It used a graphic interface very similar to the Macintosh one (!) and was sold with a mouse.

Several languages were supplied with the computer: Lisp, C, Fortran and, InterLISP (developed by Xerox).

It used a custom CPU, the 68000 was used to run the keyboard, the mouse and to boot the main processor. The main processor had an architecture derived from the MIT CADR Lisp machines.

In 1983, it cost about $110,000!


More information from Peter Grace:
I worked for Symbolics in the UK until the company went into chapter 11. I then bought the UK stock to provide support to UK and European users.
The 68000 processor was used to bootstrap the LISP processor.
The processor on the 36XX systems had a 36 bit wide word, 32 bits data 4 bits data type.
The processor was integrated onto a single CPU, the Ivory, then used 32 bit data , 8 bit data type. This CPU used in systems MacIvory, XL1200 and NXP1000.

Michael Haynie adds:
The Symbolics family of computers were designed to run LISP more or less directly. So the OS was also written in LISP. It was known as Genera. I still have the manuals for Genera 8.
The primary display is a monochrome bitmap display, black text on a green-grey-white background. Very easy on the eyes. Manufactured by Symbolics, Inc.
I also have a pair -- a 3650 and 3620, both later models.

Brad Miller specifies:
The native LISP that Symbolics ran was Zeta-Lisp and the built in editor was Z-MACS, a version of the emacs editor.
I have a pair of 3620 machines complete with monitors, keyboards and documentation that I bought at an auction in the mid 1990s. The machine used additional keyboard modifiers for extended commands; so the keyboards have super, hyper and meta keys in addition to the normal key set.
The earliest 3600s were about the size of an 18 cubic foot refrigerator. They stood about five feet tall by about 2.5 feet wide and three feet deep. The 3620s that I have are only slightly larger than current desk side Intel machines, but the Symbolics are much heavier.

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


I used Symbolics LISPMs in the latter half of 80s to early 90s. They were far ahead of anything else. Many programmers felt that they were about an order of magnitude more productive on these compared to the alternatives at the time. The geniuses who designed the LISPMs (originally a prototype in the MIT AI lab) created a completely integrated environment in which the same keyboard shortcuts were available everywhere. The compiler was amazing: one could do incremental compiles e.g. just recompile the function you had just added or changed without recompiling the whole, possibly very large program. Of course you had to do a global recompile from time to time. We had two head systems $ color graphics on one monitor, and the Zmacs editor, etc on the other monitor. I could change my program easily without reloading, linking, etc. by using the incremental compilation capability. I''ve never experienced anything close since. Thirty years ago! Some may find this hard to believe, but others who used these systems can verify. In the mid-90s we created a weak imitation on Silicon Graphics computers $ a large C++ program with OpenGL and OpenInventor and the Guile scripting language on top that allowed one to do a lot of things dynamically with the underlying 3D graphics. Not as flexible though. I maintain that in some respects the Symbolics LISPMS represent a pinnacle of computer engineering that has never been equaled.

Sunday 27th August 2017
Allan Dobbins (United States)

Actually in 2002 the CCC had a talk on Lisp machines.

Apparently on those the RAM was just cache for the disk. They didn''t have a file system as such, but used the LISP memory management for that.

Apparently the web server of the white house ran on a LISP machine during the Clinton era.

Wednesday 5th September 2012
Christian Berger

Yes, Symbolics later created NUBUS add in cards that worked with 68K macintosh Quadras called the Macivory, Macivory II, and Macivory III.

If you want to pick one up for yourself you can email Note that they''re pretty pricey.

Here''s a screenshot of a macivory:

Saturday 30th July 2011


MANUFACTURER  Scientific Computer
TYPE  Professional Computer
YEAR  1983
KEYBOARD  Full-stroke keyboard
CPU  Custom chip + Motorola MC 68000
RAM  2.3 MB
ROM  Unknown
GRAPHIC MODES  1100 x 800 / 1280 x 1024
COLORS  Monochrome display ?
SOUND  Unknown
I/O PORTS  Centronics, RS232c (3), Ethernet
BUILT IN MEDIA  Hard Disk (170 MB)
OS  Unknown
POWER SUPPLY  Power supply built-in the system
PRICE  $110 000 (USA, 1983)

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