Hall-effect keyboard query / was Re: Sources for 8b TTL keyboards (Keytronics)

[Chuck Guzis]

On 4 Dec 2008 at 20:08, Brent Hilpert wrote:

> With all this talk of old keyboards, I figured it was time to pull out one that
> I've had kicking around for awhile but hadn't assessed as yet. It's a
> very-ASCII keyboard (control codes are labeled on the keys) using Hall-effect keyswitches:
>   MICRO SWITCH
>   Freeport, Illinois
>   61SW12-2
>   SW-10405
>   date-stamp: 75/49 (1975)
> (Would the MICRO SWITCH indicate this was from Honeywell?)

I don't know that Honeywell tinkered much with the Freeport operation 
in 1975.  I've got a couple of keyboards similar to yours from 1977, 
but with different encoder IC's (outputs something like "scan 
codes").  A lot of the encoders of the time were custom mask-
programmed items.

Micro Switch made keyboards for a *lot* of firms.  

Cheers,
Chuck