Chuck Guzis cclist at sydex.com
Fri Oct 16 16:19:40 CDT 2015

On 10/16/2015 01:48 PM, Brad wrote:

> When I connected it to my PC running PUTTY via serial cable, I fully
> expected it to do nothing.  But to my surprise, it generates a
> continuous stream of Js (punctuated by the odd H) on the PUTTY screen
> if the RECV switch is off.  If I hit Break, it generates a whole
> bunch of Bs.  If I switch the RECV switch ON, the Js stop but I can
> still generate Bs with the Break key.

It sounds like it's time to get the old 'scope out and check the UART 
clock signal (do you have the TR1602 or the AY-3-1013?) and also the 
-12V at the chip.


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