'IBM 360/370 funasset.com built a box to go from a channel to a pc (mid 90's) I have the external box, there apparently was a card as well with a 37 pin connector that went in the pc they used TI 751730 interface chips DEC built 6' rack sized interfaces for the 10 and 11 to talk to a channel in the 70's (the DX-10 and DX-11)