DECISION COMPUTER INTERNATIONAL CO., LTD.

IPC8255/8254

Card Type   Data acquisition
Chipset     8254/8255
I/O Options Digital I/O lines (24)
Data Bus    IPCCPU expansion bus

[Image]

                                CONNECTIONS

        Function            Label            Function             Label

  IPCCPU expansion bus       P1       8254 clock signals (see      P3
                                      pinout below)

  8255 digital I/O lines     P2       Unidentified                 P4
  1-24 (see pinout
  below)

                         P2 PINOUT

       Function          Pin         Function          Pin

  Channel 0 bit 0         1     Channel 1 bit 5        14

  Channel 0 bit 1         2     Channel 1 bit 6        15

  Channel 0 bit 2         3     Channel 1 bit 7        16

  Channel 0 bit 3         4     Channel 2 bit 0        17

  Channel 0 bit 4         5     Channel 2 bit 1        18

  Channel 0 bit 5         6     Channel 2 bit 2        19

  Channel 0 bit 6         7     Channel 2 bit 3        20

  Channel 0 bit 7         8     Channel 2 bit 4        21

  Channel 1 bit 0         9     Channel 2 bit 5        22

  Channel 1 bit 1        10     Channel 2 bit 6        23

  Channel 1 bit 2        11     Channel 2 bit 7        24

  Channel 1 bit 3        12     Ground                 25

  Channel 1 bit 4        13     +5V DC power           26

                         P3 PINOUT

       Function          Pin         Function          Pin

  Channel 1 bit 0         1     Clock signal 1 in       8

  Clock signal 0 in       2     Channel 1 bit 4         9

  Channel 1 bit 1         3     Gate signal 1 out      10

  Gate signal 0 out       4     Channel 1 bit 5        11

  Channel 1 bit 2         5     Clock signal 1 out     12

  Clock signal 0 out      6     Channel 1 bit 6        13

  Channel 1 bit 3         7     Clock signal 2 in      14

                             P3 PINOUT (CON’T)

          Function             Pin             Function             Pin

  Channel 1 bit 7              15      4.9152MHz clock signal        21

  Gate signal 2 out            16      Inverse of clock signal 1     22
                                       out

  TO1 signal                   17      2.4576MHz clock signal        23

  Clock signal 2 out           18      Inverse of clock signal 2     24
                                       out

  9.8304MHz clock signal       19      Ground                        25

  Inverse of clock signal 0    20      +5V DC power                  26
  out

                        USER CONFIGURABLE SETTINGS

                  Setting                      Label         Position

  »   Card is first card                        JP2         Pins 3 & 4
                                                              closed

      Card is second card                       JP2         Pins 1 & 2
                                                              closed

                        BASE I/O ADDRESS SELECTION

   Setting       JP1/A       JP1/B       JP1/C       JP1/D        JP1/E

       90h      Closed        Open        Open        Open        Open

       A0h       Open        Closed       Open        Open        Open

  »    B0h       Open         Open       Closed       Open        Open

       C0h       Open         Open        Open       Closed       Open

       E0h       Open         Open        Open        Open       Closed

                          CLOCK 0 RATE SELECTION

        Setting               JP3/A           JP3/B            JP3/C

  »       2.4576MHz           Open             Open            Closed

          4.9152MHz           Open            Closed            Open

          9.8304MHz          Closed            Open             Open

                          CLOCK 1 RATE SELECTION

        Setting               JP4/A           JP4/B            JP4/C

  »       2.4576MHz           Open             Open            Closed

          4.9152MHz           Open            Closed            Open

          9.8304MHz          Closed            Open             Open

                          CLOCK 2 RATE SELECTION

        Setting               JP5/A           JP5/B            JP5/C

  »       2.4576MHz           Open             Open            Closed

          4.9152MHz           Open            Closed            Open

          9.8304MHz          Closed            Open             Open

                       MISCELLANEOUS TECHNICAL NOTES

  This card is designed to be used with Decision Computer International
  Co., Ltd.’s IPCCPU board. See this document for more information.