.
XRT59L921 - TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
COM81C17 - TWENTY PIN UART
MP240D4 - (MP240D2 / MP240D4) Solid State Relays
81C17 - TWENTY PIN UART
MP240D2 - (MP240D2 / MP240D4) Solid State Relays
SAA5252 - Line twenty-one acquisition and display LITOD
