UNIDENTIFIED

1200/300 BAUD MODEM

Modem Type                   Data (synchronous/asynchronous)
Maximum Data Rate            1200bps
Data Bus                     8-bit ISA
Data Modulation Protocol     Bell 103 & 212A, ITU-T V.22
Error Correction/Compression Unidentified

[Image]

                                CONNECTIONS

         Purpose           Location            Purpose           Location

  Line-in                     J1       Line-out                    J2

                  INTERRUPT SELECT - JP1

  IRQ        Jumper A    Jumper B    Jumper C    Jumper D

  » IRQ4       Open        Open       Closed       Open

  IRQ2        Closed       Open        Open        Open

  IRQ3         Open       Closed       Open        Open

  IRQ5         Open        Open        Open       Closed

               ADDRESS SELECT

  COM/Address      SW1/1          SW1/2

  » COM1/3F8h       Off            Off

  COM2/2F8h         Off            On

  COM3/3E8h          On            Off

  COM4/2E8h          On            On

                  RECEIVED LINE SIGNAL DETECT BIT (RLSD)

  Setting                                                    SW1/3

  » RLSD bit reset/carrier detect status written to           Off
  modem status register.

  RLSD bit written to modem status register.                  On

                         DATA TERMINAL READY (DTR)

  Setting                                               SW1/4

  » DTR bit status written to the UART                   Off
  modem control register.

  DTR bit is ignored.                                    On

                   PROTOCOL SELECT

           Protocol                    SW1/5

  » Bell 103 & 212A enabled.            Off

  CCITT V.22 enabled.                   On

                      MAKE/BREAK RATIO

  Setting                                   SW1/6

  » 39/61 ratio (Bell standard).             Off

  33/67 ratio (CCITT standard).               On