I was digging through my archives and came across some Frobco tools for 2600 and 5200 development. These were basically EPROM emulators that used a host Apple II as a development platform/monitor.
I've got both the Frob (2600) and 5200 setups, including the Apple II software and the manuals. I thought maybe some people here wouldn't mind taking a look at them for posterity's sake. I've got other documentation and stuff that I could take pictures of if anyone is interested.
Frob host card, (3) 2600 adaptors
Frob host card, 5200 adaptor