[nickjohnson] sent in today’s hack. Mike removed the extraneous hardware, just leaving the UART on this IBM PCMCIA modem and replaced it with a SMD MAX241 ttl-rs232 converter. He added a new end ...

PCMCIA networking cards allow ... S/T and U. On an ISDN modem, the S/T interface is where other ISDN devices connect. ISDN devices also need an NT1 terminator between the ISDN device and the wall jack ...