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
