Description:
NuBus card enables communication with IBM 3274 terminal controllers via external BNC connector. 3270 emulator program is used on host.
Identifying Numbers:
IRMA™ Workstation for Macintosh; 80-20072-000E; 003090 REV. A (ROM)
Onboard logic:
DCA 9006 UG B1061 002925; AM2764A, AM27C64 -255DC, M5L2764K (ROM)
Photo of this card adjacent to three other examples - the three ROMs I could read were identical

Description:
NuBus card enables communication with IBM 3274 terminal controllers via external BNC connector. (RJ-11?)
Identifying Numbers:
MacIRMA; 003088 REV. A; 003098 REV A; 002990 REV.A BUSMAN 3E V. (ROM)
Onboard logic:
DCA 9252AV 269201 4519-0002 002925; AMD AM27C64 -255DC (ROM)