The Cosmac ELF.. yes, I too was aware of the 1802, and there are of course other important microprocessors from that time period. But those four covered a lot

The Cosmac ELF.. yes, I too was aware of the 1802, and there are of course other important microprocessors from that time period. But those four covered a lot among themselves - in particular the trio 6502/8080/Z80. But of course there were others. The Texas TMS9*, the 6800 already mentioned, then there's of course the 6809 (Tandy Color Computer, Dragon (basically a clone), the 6809 variant of the aforementioned SWTPC. Or we can as well find a list: https://en.wikipedia.org/wiki/Microprocessor_chronology https://en.wikipedia.org/wiki/Microprocessor_chronology