The KIM-1
Don't know the timing on the SWTPC 6800. The only ready-to-go
computer I spotted around the time of the KIM-1 was a thing called
the SOL; by all reports, this one didn't do much.
I have the vague impression that SWTP (South West Technical
Products) and OSI (Ohio Scientific) appeared around the same time,
about six months after the KIM-1. But that's not hard history.