<Was any machine (most likely mainframe class) ever built using F100K ECL <(the super fast stuff - even today)? The family is small but well thought <out, and includes some rather bizarre functions. I'm not certain but it may be in the VAX9000 series. It was all ECL and the ecl was built up into special modules to control heat and compact the circuitry (for less wire). It was a fast machine but costly to build and would get real upset if the cooling failed.. Allison