920M - an European contemprary of the Apollo Guidance Computer

Curious Marc curiousmarc3 at gmail.com
Tue May 4 00:02:10 CDT 2021


Quite impressive indeed! I did not know of these machines.
Marc

> On May 3, 2021, at 12:02 PM, Adrian Stoness via cctech <cctech at classiccmp.org> wrote:
> 
> ooo thanks for sharing
> 
>> On Mon, May 3, 2021 at 1:50 PM Dr. Erik Baigar via cctech <
>> cctech at classiccmp.org> wrote:
>> 
>> 
>> Some additional remarks: The 920M is par of the 900 Series from
>> Elliott (later Elliott Automation, GEC Marconi Avionics, BAe Systems)
>> 
>> ...maybe interesting to note, that apart from the 18bit 920M and
>> related machines, there is a series of 12 bit ones which have a
>> simmilar (but not identical) instruction set.
>> 
>> ...even one member of the family had 13 bits.
>> 
>> ...these machines where used in applications, where accuracy was
>>    less important (autothrottle compputers, air data systems) and
>>    size/weight/power consumption was paramount.
>> 
>> 
>> Sorry, by accident the footer from my work email was with the
>> first posting - all the project is entirely hobby work and not
>> related to the business I am working for...
>> 
>> That is my private signature ;-)
>>> 
>>>                               ''~``
>>>                              ( o o )
>>> +------------------------.oooO--(_)--Oooo.--------------------------+
>>> | Dr. Erik Baigar                             Inertial Navigation & |
>>> | erik at baigar.de           .oooO              Vintage Computer      |
>>> | www.baigar.de            (   )   Oooo.      Hobbyist              |
>>> +---------------------------\ (----(   )----------------------------+
>>>                             \_)    ) /
>>>                                   (_/
>>> 
>>> 
>> 
>> 


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