Pretty much. Architecturally, they're the same. The usual distinction is the 3b1 has a "hump" to accomodate a physically larger disk drive. There has been a suggestion, though debated, that the 3b1 also has a beefier PS. That's a good question. Because they contained UNIX SYS V R2, most everyone was pretty careful about throwing around copies. So I don't know of any online images of them. Your best bet might be to find someone who has a set they'll send you, or perhaps a set they've backed up. In general, the first place to look is Peter da Silva's page: http://unixpc/taronga.com There's a classic issue of corrosion on the PS connector. That might be part of your problem. It gets easier with practice. I used to do quite a lot with them, but haven't fired one up in probably 5 years. I used to maintain the archive that Peter maintains now. BLS