DECISION COMPUTER INTERNATIONAL CO., LTD.

MULTI 8255/8253 CARD

Card Type      Data acquisition
Chip Set       NEC 8253, 8255
I/O Options    Digital I/O ports (4), counter port
Data Bus       8-bit ISA

[Image]

                                CONNECTIONS

         Function            Label            Function            Label

  Digital I/O port 1 (see     CN1      8255 chip for port 4        U3
  pinout below)                        (channel 7)

  Digital I/O port 2 (see     CN2      8255 chip for port 4        U4
  pinout below)                        (channel 8)

  Digital I/O port 3 (see     CN3      8255 chip for port 1        U6
  pinout below)                        (channel 1)

  Digital I/O port 4 (see     CN4      8255 chip for port 1        U7
  pinout below)                        (channel 2)

  8253 counter port (see      CN5      8255 chip for port 2        U8
  pinout below)                        (channel 3)

  8255 chip for port 3        U1       8255 chip for port 2        U9
  (channel 5)                          (channel 4)

  8255 chip for port 3        U2
  (channel 6)

                       CN1-CN4 PINOUT

       Function          Pin         Function          Pin

  Channel 1A bit 0        1     Channel 1C bit 2       19

  Channel 1A bit 1        2     Channel 1C bit 3       20

  Channel 1A bit 2        3     Channel 1C bit 4       21

  Channel 1A bit 3        4     Channel 1C bit 5       22

  Channel 1A bit 4        5     Channel 1C bit 6       23

  Channel 1A bit 5        6     Channel 1C bit 7       24

  Channel 1A bit 6        7     Ground                 25

  Channel 1A bit 7        8     Ground                 26

  Channel 1B bit 0        9     Channel 2A bit 0       27

  Channel 1B bit 1       10     Channel 2A bit 1       28

  Channel 1B bit 2       11     Channel 2A bit 2       29

  Channel 1B bit 3       12     Channel 2A bit 3       30

  Channel 1B bit 4       13     Channel 2A bit 4       31

  Channel 1B bit 5       14     Channel 2A bit 5       32

  Channel 1B bit 6       15     Channel 2A bit 6       33

  Channel 1B bit 7       16     Channel 2A bit 7       34

  Channel 1C bit 0       17     Channel 2B bit 0       35

  Channel 1C bit 1       18     Channel 2B bit 1       36

                          CN1-CN4 PINOUT (CON’T)

         Function             Pin             Function             Pin

  Channel 2B bit 2             37      Channel 2C bit 1             44

  Channel 2B bit 3             38      Channel 2C bit 2             45

  Channel 2B bit 4             39      Channel 2C bit 3             46

  Channel 2B bit 5             40      Channel 2C bit 4             47

  Channel 2B bit 6             41      Channel 2C bit 5             48

  Channel 2B bit 7             42      Channel 2C bit 6             49

  Channel 2C bit 0             43      Channel 2C bit 7             50

            Note:CN2 through CN4 are wired identically to CN1. CN1 has
            the signals for channels 1 and 2. CN2 through CN4 have the
            signals for channels 3 through 8, respectively.

                                CN5 PINOUT

          Function             Pin             Function             Pin

  Ground                        1      Counter 2B clock signal       18
                                       in

  Counter 1A clock signal       2      Gate 2B signal                19
  in

  Gate 1A signal                3      Counter 2B clock signal       20
                                       out

  Counter 1A clock signal       4      Ground                        21
  out

  Ground                        5      Counter 2C clock signal       22
                                       in

  Counter 1B clock signal       6      Gate 2C signal                23
  in

  Gate 1B signal                7      Counter 2C clock signal       24
                                       out

  Counter 1B clock signal       8      Ground                        25
  out

  Ground                        9      +5V DC power                  26

  Counter 1C clock signal       10     Ground                        27
  in

  Gate 1C signal                11     -5V DC power                  28

  Counter 1C clock signal       12     Ground                        29
  out

  Ground                        13     +12V DC power                 30

  Counter 2A clock signal       14     Ground                        31
  in

  Gate 2A signal                15     -12V DC power                 32

  Counter 2A clock signal       16     Ground                        33
  out

  Ground                        17     Ground                        34

                        USER CONFIGURABLE SETTINGS

                  Setting                      Label         Position

  »   Counter 1A uses internal clock           JP1/A          Closed
      source

      Counter 1A uses external clock           JP1/A           Open
      source

  »   Counter 1B uses internal clock           JP1/B          Closed
      source

      Counter 1B uses external clock           JP1/B           Open
      source

  »   Counter 1C uses internal clock           JP1/C          Closed
      source

      Counter 1C uses external clock           JP1/C           Open
      source

  »   Counter 2A uses internal clock           JP2/A          Closed
      source

      Counter 2A uses external clock           JP2/A           Open
      source

  »   Counter 2B uses internal clock           JP2/B          Closed
      source

      Counter 2B uses external clock           JP2/B           Open
      source

  »   Counter 2C uses internal clock           JP2/C          Closed
      source

      Counter 2C uses external clock           JP2/C           Open
      source

  »   Base I/O address set to 140h              JP3           Closed

      Base I/O address set to 100h              JP3            Open