@BLKTCON0
First, thanks for the reply and the tutorial.
You're right. Forgot to mention I was using a 3.1 ROM.
After reading your reply, I tried the switch again.
I also applies a bit more pressure with the heel of my hand and was rewarded with a nice "chunk" sound as the adapter seated in properly into the socket. That may have been the root cause of my initial problems. Those machined pins require a bit more pressure than I was expecting.
BTW, all changes in switch position and plug in location were done with the computer OFF. Also studying the theory behind this switch from a file in aminet shows only the sel0 and sel1 are being switched so there shouldn't be a problem with voltages going to ground.
Trying the switch in the outer set or pins resulted in the Insert disk screen on both positions of the switch.
Moving the switch connector to the inner set of pins results in being able to boot from the "external" drive but the internal drive is nowhere to be found!
Switching the switch to (what I guess is) the default position, the internal disk boots up just find AND the external drive is found.
So, it does sound like the switch is sort of working. Drives can be switched, but by booting from the external drive, with the switch in circuit, results in the "loss" of the internal drive.
Weird!
