K8LH Serial Backpack

Mike,

I decided to start a new thread on this rather than tack it on to the old one.

Because of the significant effort in breadboarding your design, and because it has already been vetted, I am going straight to a perfboard prototype. To that end, I have drawn my own schematic to follow as I wire the prototype.

Would you take a look and tell me if you see any errors? Thanks.