PROMISE TECHNOLOGY, INC.

DC420

  Data bus:                32-bit, VL-bus

  Size:                    Three/quarter-length, full-height card

  Hard drive supported:    Two IDE (AT) interface drives

  Floppy drives            Two 360KB, 720KB, 1.2MB or 1.44MB drives
  supported:

[Image]

                              CONNECTIONS

                    Function                           Location

  25-pin parallel port - external                         CN1

  9-pin serial port 1 - external                          CN2

  10-pin serial port 2 - internal                         CN3

  34-pin control cable connector - floppy drive           J1

  40-pin IDE (AT) Interface connector                     J3

  4-pin connector - drive active LED                      JP3

                        USER CONFIGURABLE SETTINGS

                Function                    Location          Setting

  »   Main board supports VL-bus ID3           JP1           pins 1 & 2
      (speed < 50MHz)                                         closed

      Main board does not support              JP1           pins 2 & 3
      VL-bus ID3 (speed > 50MHz)                              closed

  »   Factory configured - do not alter        JP2           pins 1 & 2
                                                              closed

  »   Floppy drive enabled                    JP4/G          pins 1 & 2
                                                              closed

      Floppy drive disabled                   JP4/G          pins 2 & 3
                                                              closed

                     SERIAL PORT 1 (CN2) CONFIGURATION

         COM/Address/IRQ                JP4/A                JP4/B

  »        COM1/3F8h/IRQ4         pins 1 & 2 closed    pins 2 & 3 closed

           COM3/3E8h/IRQ4         pins 2 & 3 closed    pins 1 & 2 closed

              Disabled            pins 2 & 3 closed    pins 2 & 3 closed

                     SERIAL PORT 2 (CN3) CONFIGURATION

         COM/Address/IRQ                JP4/C                JP4/D

  »        COM2/2F8h/IRQ3         pins 1 & 2 closed    pins 2 & 3 closed

           COM4/2E8h/IRQ3         pins 2 & 3 closed    pins 1 & 2 closed

              Disabled            pins 2 & 3 closed    pins 2 & 3 closed

                     PARALLEL PORT (CN1) CONFIGURATION

       Address/IRQ             JP4/E           JP4/F           JP4/H

  »       378h/IRQ7           pin 1 & 2      pins 2 & 3      pins 2 & 3
                               closed          closed          closed

          3BCh/IRQ7          pins 1 & 2      pins 1 & 2      pins 2 & 3
                               closed          closed          closed

          278h/IRQ5          pins 2 & 3      pins 1 & 2      pins 1 & 2
                               closed          closed          closed

           Disabled          pins 2 & 3      pins 2 & 3    all pins open
                               closed          closed

  PARALLEL PORT BI-DIRECTIONAL FUNCTION

       Setting                JP5

   Bi-directional            open

   Uni-directional          closed

                           MEMORY CONFIGURATION

            Size                    Bank 0                  Bank 1

  »           512KB              (1) 512K x 8                None

               1MB               (1) 512K x 8            (4) 256K x 4