Sorry, two different incidents.

My first attempt was with a Mac IIci connected to my IIe card using an Apple printer cable (serial cable.) The worked fine up until it tried to verify the disk image, upon which it went kaput.

My second attempt was with my MacBook Pro using a Prolific USB to Serial adapter and a DB-9 to mini-DIn 8 cable. I bought two cables from the electronics recycler. One actually has the Apple logo on it, the other looks identical to this:



I downloaded my Prolific drivers from here:

http://www.prolific.com.tw/eng/downloads.asp?id=31