DTK COMPUTER, INC.

RS-232 DUAL I/O SHORT CARD

Card Type              Serial card
Chip Set               Unidentified
Maximum Onboard Memory Unidentified
I/O Options            Serial ports (2)
Data Bus               8-bit ISA

[Image]

                                CONNECTIONS

         Function            Label            Function             Label

  Serial port 1                J1     Serial port 2                 J2

                      SERIAL PORT 1 ADDRESS SELECTION

    Setting       S1/1        S1/2        S1/3        S1/4        S1/5

  COM1 (3F8h)      On          Off         Off         Off         On

  COM2 (3E8h)      Off         Off         Off         Off         Off

  COM3             Off         Off         On          On          Off

                SERIAL PORT 1 ADDRESS SELECTION (CONTINUED)

    Setting       S1/6        S1/7        S1/8        S1/9       S1/10

  COM1 (3F8h)      Off         Off        Off         Off         Off

  COM2 (3E8h)      On          Off        Off          On         Off

  COM3             Off         Off        Off         Off         Off

  Note: In order to use COM3, you must program COM3 into your software.
  Switches 5 & 6, 7 & 8 specify the IRQ selection. See tables below for
  specific information.

                      SERIAL PORT 2 ADDRESS SELECTION

    Setting       S1/1        S1/2        S1/3        S1/4        S1/5

  COM1 (2F8h)      Off         Off         Off         Off         Off

  COM2 (2E8h)      On          On          Off         Off         On

     COM4          Off         Off         On          On          Off

                  SERIAL PORT 2 ADDRESS SELECTION (CON’T)

      Setting         S1/6       S1/7      S1/8       S1/9       S1/10

      COM1 (2F8h)      On         On        Off        On          On

  »   COM2 (2E8h)     Off        Off        On         Off        Off

      COM4            Off        Off        Off        Off        Off

  Note: In order to use COM4, you must program COM4 into your software.

  SERIAL PORT 1 INTERRUPT SELECTION

   IRQ       COM      S1/5     S1/6

   IRQ3     COM2      Off       On

   IRQ4     COM1       On       Off

  SERIAL PORT 2 INTERRUPT SELECTION

   IRQ       COM      S1/7     S1/8

   IRQ3     COM2      Off       On

   IRQ4     COM1       On       Off

                       MISCELLANEOUS TECHNICAL NOTES

  If your system already has a serial port then you will use the settings
  for serial port 1. This will enable only one port in the RS-232 board.
  If your system does not have any aerial ports, you will have to use the
  settings for serial port 2. This will enable both ports on the RS-232
  board. To use the ports as COM3 and COM4, you will need to write
  software to support this function. Switch settings are provided.