Yeah, its fine now....it'll be interesting to see what happens tomorrow. Its just weird that for the past few days, the keys I mentioned in my first post were all dead, even after I replaced the keyboard. Then some of those keys came alive and others died. Then they all started working, and its been fine since. Yeah, I've taken it to bits and reseated the connections - I had to in order to replace the keyboard. Your advice to check for a lukewarm solder joint is actually pretty good - I didn't think of that myself, and it might be the problem....they tend to show up everywhere in vintage electronics.

And yes, being connected to the Internet on a '030 Mac via a 3G connection is very cool. Obviously, as I said the 180c isn't directly connected to the 3G modem, my setup basically looks like this: PowerBook 180c -> SCSI cable -> Asante EN/SC -> Ethernet cable -> MacBook -> 3G dongle, with the MacBook set up to share the 3G connection over ethernet. Oh, and another neat thing I've discovered with this (this is going rather off-topic now, but meh) - vintage Asante gear, such as my EN/SC normally requires that you put a 10Mbps hub between the adapter itself and newer 10/100/1000 gear, however the Marvell Yukon chipset in the MacBook seems to emulate whatever support is necessary to make a direct connection between the EN/SC and the MacBook work, which is certainly pretty neat...and definitely the most trouble-free experience I've ever had with old Asante gear.