...i2i trust me. What you see in the second picture is what I took out from the SD2.
If a similar PKS-DIGIPLAN called cd20 exists I totally disregard. But this is my chance so please educate me.
How many Amps drive is that cd20 capable to deliver. Probably the machine you took this from is a more powerful one compared to the little Orac.
And this was not the first time the SD2 needed to be dismantled for fixing. In the past, it blew a 40xxx series CMOS. The CD40106.
But today it looks a bit different because I have added DIP sockets for every single chip. and the appropriate sockets for transistor or diode in the PC boards.

cheers

Asto