The /370 vision of a single chip mainframe was realized, I think the article ends prematurely. The first card I've actually seen as such is the P/370 and that

The /370 vision of a single chip mainframe was realized, I think the article ends prematurely. The first card I've actually seen as such is the P/370 and that may have been a productized version of this chip. There were some other skunk works projects that might predate that http://www.garlic.com/~lynn/2002d.html#4 http://www.garlic.com/~lynn/2002d.html#4. As others pointed out "real" S/390s also switched to CMOS microprocessors in the 90s. There's some good reading in http://ps-2.kev009.com/ohlandl/P390/s390_i-o_continues.txt http://ps-2.kev009.com/ohlandl/P390/s390_i-o_continues.txt on the evolution of the I/O subsystems because I/O is what makes mainframes interesting :)