I have actual 3174s with FICON attach for my 9377 and z800. Also have a Memorex-Telex 3174 clone. They are interesting machines in themselves. It's appropria

I have actual 3174s with FICON attach for my 9377 and z800. Also have a Memorex-Telex 3174 clone. They are interesting machines in themselves. It's appropriate to think of a mainframe as a distributed system of sorts, where these controllers are distinct systems that participate with the mainframe CPU over channel I/O and offload most of the terminal handling functionality.