
SEA LEVEL SYSTEMS, INC.

ACB-III

Card Type   Serial card
Chip Set    Unidentified
I/O Options Serial port
Data Bus    8-bit ISA

[Image]

         CONNECTIONS

   Function        Label

  Serial port        P1

                        USER CONFIGURABLE SETTINGS

                 Function                    Label          Position

     Factory configured  do not alter       E1          Unidentified

     Factory configured  do not alter       E7          Unidentified

      DMA tri state drivers permanently       E9       Pins 1 & 3 closed
      enabled

      DMA tri state drivers enabled by        E9       Pins 2 & 4 closed
      status control port bit 7

     Factory configured  do not alter       E11         Unidentified

     Factory configured  do not alter       E12         Unidentified

     Factory configured  do not alter       E13         Unidentified

     Factory configured  do not alter       E14         Unidentified

     Factory configured  do not alter       SW2         Unidentified

                          SERIAL PORT 1 SELECTION

                     Setting                                 E6

          Transmit clock output (TXC out)           Pins 1 & 2 closed

            Transmit clock input (TXC in)            Pins 3 & 4 closed

       Terminal timing source from SCC TRXC pin      Pins 5 & 6 closed
             or input to TXC pin 24 on P1

       Terminal timing source input to RXC pins      Pins 7 & 8 closed
              is echoed to pin 24 on P1

                 Receive clock input                Pins 11 & 12 closed

                          SERIAL PORT 2 SELECTION

                     Setting                                 E3

          Transmit clock output (TXC out)           Pins 1 & 2 closed

            Transmit clock input (TXC in)            Pins 3 & 4 closed

       Terminal timing source from SCC TRXC pin      Pins 5 & 6 closed
             or input to TXC pin 24 on P1

       Terminal timing source input to RXC pins      Pins 7 & 8 closed
              is echoed to pin 24 on P1

                 Receive clock input                Pins 11 & 12 closed

    INPUT/OUTPUT CLOCK MODE SELECTION (PORT 1)

         Setting                   E10

  Transmit clock output     Pins 1 & 2 closed

  Transmit clock input      Pins 3 & 4 closed

        Not used             Pins 5 & 6 open

   Receive clock input      Pins 7 & 8 closed

    INPUT/OUTPUT CLOCK MODE SELECTION (PORT 2)

         Setting                    E2

  Transmit clock output     Pins 1 & 2 closed

  Transmit clock input      Pins 3 & 4 closed

        Not used             Pins 5 & 6 open

   Receive clock input      Pins 7 & 8 closed

                      SERIAL PORT INTERRUPT SELECTION

                  IRQ                                   E8

                    2/9                         Pins 1 & 2 closed

                     3                          Pins 3 & 4 closed

                     4                          Pins 5 & 6 closed

                    5                          Pins 7 & 8 closed

              Normal IRQ mode                   Pins 9 & 10 closed

               Multi IRQ mode                  Pins 11 & 12 closed

                        BASE I/O ADDRESS SELECTION

  Setting    SW1/1    SW1/2    SW1/3    SW1/4   SW1/5    SW1/6     SW1/7

     238     Off      On       On       On      Off      Off       Off

      280     Off      On       Off      On       On       On       On

      2A0     Off      On       Off      On      Off       On       On

      2E8     Off      On       Off      Off     Off       On       Off

      300     Off      Off      On       On       On       On       On

      328     Off      Off      On       On      Off       On       Off

      3E8     Off      Off      Off      Off     Off       On       Off

                           DMA CHANNEL SELECTION

                Channel                                 E4

          1  two channel mode                  Pins 1 & 2 closed

          3  two channel mode                  Pins 1 & 2 closed

       Two channel A/B mode A3B1                Pins 3 & 4 closed

       Two channel A/B mode A1B3                Pins 5 & 6 closed

  Closed = channel A, Open = channel B              Pins 7 & 8

       3  acknowledges channel 3               Pins 9 & 10 closed

       1  acknowledges channel 1              Pins 11 & 12 closed

                               DMA SELECTION

                  Setting                                E5

      SCC channel A/B uses channel 3              Pins 1 & 2 closed

       SCC channel A uses channel 3               Pins 3 & 4 closed

      SCC channel A/B uses channel 1              Pins 5 & 6 closed

       SCC channel A uses channel 1               Pins 7 & 8 closed

   SCC channel B enabled for half duplex         Pins 9 & 10 closed
               DMA transfers

    SCC channel A  DMA channel 1/3 for          Pins 11 & 12 closed
           full duplex transfers

