The article mentions various old chips that interface to the 3270 data stream. Does anyone know what the similar chips are to interface to IBM's bus-and-tag? I saw bus-and-tag interface chips that converted the weird voltage levels a few years ago but lost the part number and haven't been able to find them since.
In case anyone ends up here looking for an answer, the relevant chips are the SN75121 and SN75122 for transmission lines and the SN75123 and SN75124 for IBM 360 bus-and-tag I/O (Signetics N8T13, N8T14, N8T24). The relevant IBM spec is: https://bitsavers.org/pdf/ibm/370/channel/GA22-6974-4_360_37...
