Early HP35 again: Let's play "spot the difference"

[PANAMATIK]

(11-19-2016 11:46 AM)Harald Wrote:  There is a slight modification in the PCB...

Very tricky to spot indeed.

The electrically identical modifications can be understood, when you know, that the layout was "painted" manually by slim black tape strips on a transparent film. During mass production the film had to be reused several times and some lines could have moved and had to be repaired or readjusted. Just an assumption.

Bernhard