I have a few IMST400's and IMST425's sitting in a drawer waiting for inspiration to strike for a cool project to use them in, one day. Pulled from some mid 90'

I have a few IMST400's and IMST425's sitting in a drawer waiting for inspiration to strike for a cool project to use them in, one day. Pulled from some mid 90's ISDN test equipment. These keep getting mentioned here on HN and every time I'm reminded I have these sitting here waiting for me to learn more about them. It's a very interesting architecture. Sifting thru the datasheets is daunting stuff.