In search of 4B3A Microswitch Keyswitches (for a restoration, not a keyboard collector!)

[Al Kossow]

On 7/10/20 2:14 PM, Al Kossow via cctalk wrote:

> There are a couple of serious researchers out there who do useful work, here is what exists for the SD switch
> https://deskthority.net/wiki/Micro_Switch_SD_Series
> 

the schematic of the 1660 microswitch keyboard can be found on page 235 of the maint manual
http://bitsavers.org/pdf/diablo/printer/400083-01_1660_Maintenance_Jul78.pdf

it uses x/y matrix style hall modules

the drawing you pointed to uses pulsed output switches

neither type will work in his application