On Wed, Jun 19, 2019 at 1:00 AM Al Kossow via cctalk <cctalk@classiccmp.org> wrote: > came across these this eve, probably only of interest to Seth, since he has > one > http://bitsavers.org/pdf/att/5620/schematic
I have one too (from a friend who used to work in the Columbus Bell Labs Operating System Group (cbosg)). I found the read-through to be quite illuminating, especially the detail on the keyboard circuit (4800 bps TTL levels off one channel of the DUART). I do have a keyboard but this info makes it simple to contemplate a keyboard adapter for those that do not. Thanks for posting this, Al. -ethan
