Thor Lancelot Simon <tls@rek.tjls.com> said;

> The follow-on to the R3000
> was the R6000, which implemented an instruction set much more like that
> of modern 32-bit MIPS processors, but which was very expensive, had supply
> problems, and ran quite hot -- unsurprising, since it was implemented in 
> ECL.

At some time some RISC manufactures headed toward ECL technology expecting
higher performance.  Unfortunately it was an extreme technology smashed into
dead-end.  Besides awesome multiple chip configuration, R6000 demanded an
extreme electronical characteristics which could not be achieved by stock off-
the-shelf components.  Then, RC62xx caught by severe manufacturing issues
was never sold well on market...

Toru Nishimura/ALKYL Technology