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# DECISION COMPUTER INTERNATIONAL CO., LTD.
8255/8254 LAB CARD
Card Type Data acquisition
Chip Set NEC 8255
I/O Options Digital I/O ports (2)
Data Bus 8-bit ISA
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|-----------------------------+-------+--------------+-------|
| Breadboard (see pinout | BB1 | Unidentified | CN3 |
| below) | | | |
|-----------------------------+-------+--------------+-------|
| Digital I/O port 1 (see | CN1 | Unidentified | CN4 |
| pinout below) | | | |
|-----------------------------+-------+--------------+-------|
| Digital I/O port 2 (see | CN2 | | |
| pinout below) | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BB1 PINOUT |
|------------------------------------------------------------|
| Function | Row | Function | Row |
|----------------------+-------+----------------------+------|
| Channel 1A bit 7 | 1 | Channel 1C bit 6 | 21 |
|----------------------+-------+----------------------+------|
| Channel 1A bit 6 | 2 | Channel 1C bit 5 | 22 |
|----------------------+-------+----------------------+------|
| Channel 1A bit 5 | 3 | Channel 1C bit 4 | 23 |
|----------------------+-------+----------------------+------|
| Channel 1A bit 4 | 4 | Channel 1C bit 3 | 24 |
|----------------------+-------+----------------------+------|
| Channel 1A bit 3 | 5 | Channel 1C bit 2 | 25 |
|----------------------+-------+----------------------+------|
| Channel 1A bit 2 | 6 | Channel 1C bit 1 | 26 |
|----------------------+-------+----------------------+------|
| Channel 1A bit 1 | 7 | Channel 1C bit 0 | 27 |
|----------------------+-------+----------------------+------|
| Channel 1A bit 0 | 8 | Not used | 28 |
|----------------------+-------+----------------------+------|
| Not used | 9 | Channel 1B bit 7 | 29 |
|----------------------+-------+----------------------+------|
| Clock signal 0 in | 10 | Channel 1B bit 6 | 30 |
|----------------------+-------+----------------------+------|
| Clock signal 1 in | 11 | Channel 1B bit 5 | 31 |
|----------------------+-------+----------------------+------|
| Clock signal 2 in | 12 | Channel 1B bit 4 | 32 |
|----------------------+-------+----------------------+------|
| Gate signal 0 | 13 | Channel 1B bit 3 | 33 |
|----------------------+-------+----------------------+------|
| Gate signal 1 | 14 | Channel 1B bit 2 | 34 |
|----------------------+-------+----------------------+------|
| Gate signal 2 | 15 | Channel 1B bit 1 | 35 |
|----------------------+-------+----------------------+------|
| Clock signal 0 out | 16 | Channel 1B bit 0 | 36 |
|----------------------+-------+----------------------+------|
| Clock signal 1 out | 17 | Not used | 37 |
|----------------------+-------+----------------------+------|
| Clock signal 2 out | 18 | I/O write register | 38 |
|----------------------+-------+----------------------+------|
| Not used | 19 | I/O read register | 39 |
|----------------------+-------+----------------------+------|
| Channel 1C bit 7 | 20 | | |
|------------------------------------------------------------|
| Note:The breadboard is designed to prototype designs. |
| All holes in a given row are electrically connected. |
| Rows marked not used may be utilized by the designer |
| for extra connections. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CN1 PINOUT |
|------------------------------------------------------------|
| Function | Pin | Function | Pin |
|------------------------+------+---------------------+------|
| Ground | 1 | Channel 1C bit 6 | 21 |
|------------------------+------+---------------------+------|
| Ground | 2 | Channel 1C bit 7 | 22 |
|------------------------+------+---------------------+------|
| Ground | 3 | Channel 1C bit 4 | 23 |
|------------------------+------+---------------------+------|
| Channel 1A bit 3 | 4 | Channel 1C bit 5 | 24 |
|------------------------+------+---------------------+------|
| Channel 1A bit 1 | 5 | Channel 1C bit 1 | 25 |
|------------------------+------+---------------------+------|
| Channel 1A bit 2 | 6 | Channel 1C bit 0 | 26 |
|------------------------+------+---------------------+------|
| Clock signal 0 in | 7 | Channel 1B bit 7 | 27 |
|------------------------+------+---------------------+------|
| Channel 1A bit 0 | 8 | Channel 1C bit 2 | 28 |
|------------------------+------+---------------------+------|
| Gate signal 0 | 9 | Channel 1B bit 6 | 29 |
|------------------------+------+---------------------+------|
| Clock signal 0 out | 10 | Channel 1C bit 3 | 30 |
|------------------------+------+---------------------+------|
| Clock signal 2 out | 11 | Channel 1B bit 5 | 31 |
|------------------------+------+---------------------+------|
| Clock signal 2 in | 12 | Channel 1B bit 0 | 32 |
|------------------------+------+---------------------+------|
| Clock signal 1 in | 13 | Channel 1B bit 4 | 33 |
|------------------------+------+---------------------+------|
| Gate signal 2 | 14 | Channel 1B bit 1 | 34 |
|------------------------+------+---------------------+------|
| Clock signal 1 out | 15 | Channel 1B bit 3 | 35 |
|------------------------+------+---------------------+------|
| Gate signal 1 | 16 | Channel 1B bit 2 | 36 |
|------------------------+------+---------------------+------|
| Channel 1A bit 5 | 17 | +5V power | 37 |
|------------------------+------+---------------------+------|
| Channel 1A bit 4 | 18 | -5V power | 38 |
|------------------------+------+---------------------+------|
| Channel 1A bit 7 | 19 | +12V power | 39 |
|------------------------+------+---------------------+------|
| Channel 1A bit 6 | 20 | -12V power | 40 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CN2 PINOUT |
|------------------------------------------------------------|
| Function | Pin | Function | Pin |
|-----------------------+------+----------------------+------|
| Ground | 1 | Channel 2C bit 7 | 21 |
|-----------------------+------+----------------------+------|
| Ground | 2 | Channel 2C bit 6 | 22 |
|-----------------------+------+----------------------+------|
| Ground | 3 | Channel 2C bit 5 | 23 |
|-----------------------+------+----------------------+------|
| Ground | 4 | Channel 2C bit 4 | 24 |
|-----------------------+------+----------------------+------|
| Ground | 5 | Channel 2C bit 0 | 25 |
|-----------------------+------+----------------------+------|
| Ground | 6 | Channel 2C bit 1 | 26 |
|-----------------------+------+----------------------+------|
| Ground | 7 | Channel 2C bit 2 | 27 |
|-----------------------+------+----------------------+------|
| Ground | 8 | Channel 2B bit 7 | 28 |
|-----------------------+------+----------------------+------|
| Ground | 9 | Channel 2C bit 3 | 29 |
|-----------------------+------+----------------------+------|
| Ground | 10 | Channel 2B bit 6 | 30 |
|-----------------------+------+----------------------+------|
| Ground | 11 | Channel 2B bit 0 | 31 |
|-----------------------+------+----------------------+------|
| Ground | 12 | Channel 2B bit 5 | 32 |
|-----------------------+------+----------------------+------|
| Channel 2A bit 0 | 13 | Channel 2B bit 1 | 33 |
|-----------------------+------+----------------------+------|
| Channel 2A bit 1 | 14 | Channel 2B bit 4 | 34 |
|-----------------------+------+----------------------+------|
| Channel 2A bit 2 | 15 | Channel 2B bit 2 | 35 |
|-----------------------+------+----------------------+------|
| Channel 2A bit 3 | 16 | Channel 2B bit 3 | 36 |
|-----------------------+------+----------------------+------|
| Channel 2A bit 4 | 17 | +5V power | 37 |
|-----------------------+------+----------------------+------|
| Channel 2A bit 5 | 18 | -5V power | 38 |
|-----------------------+------+----------------------+------|
| Channel 2A bit 6 | 19 | +12V power | 39 |
|-----------------------+------+----------------------+------|
| Channel 2A bit 7 | 20 | -12V power | 40 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|-----------------------------------------+-------+----------|
| » | Counter 0 uses internal clock | JP1/A | Closed |
| | source | | |
|---+-------------------------------------+-------+----------|
| | Counter 0 uses external clock | JP1/A | Open |
| | source | | |
|---+-------------------------------------+-------+----------|
| » | Counter 1 uses internal clock | JP1/B | Closed |
| | source | | |
|---+-------------------------------------+-------+----------|
| | Counter 1 uses external clock | JP1/B | Open |
| | source | | |
|---+-------------------------------------+-------+----------|
| » | Counter 2 uses internal clock | JP1/C | Closed |
| | source | | |
|---+-------------------------------------+-------+----------|
| | Counter 2 uses external clock | JP1/C | Open |
| | source | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS |
|------------------------------------------------------------|
| Setting | JP2/A | JP2/B | JP2/C | JP2/D | JP2/E | JP2/F |
|----------+--------+--------+-------+-------+-------+-------|
| | 000h | Closed | Closed |Closed |Closed |Closed |Closed |
|---+------+--------+--------+-------+-------+-------+-------|
| | 010h | Closed | Closed |Closed |Closed |Closed | Open |
|---+------+--------+--------+-------+-------+-------+-------|
| | 020h | Closed | Closed |Closed |Closed | Open |Closed |
|---+------+--------+--------+-------+-------+-------+-------|
| | 030h | Closed | Closed |Closed |Closed | Open | Open |
|---+------+--------+--------+-------+-------+-------+-------|
| | 040h | Closed | Closed |Closed | Open |Closed |Closed |
|---+------+--------+--------+-------+-------+-------+-------|
|» | 2A0h | Open | Closed | Open |Closed | Open |Closed |
|---+------+--------+--------+-------+-------+-------+-------|
| | 3B0h | Open | Open | Open |Closed | Open | Open |
|---+------+--------+--------+-------+-------+-------+-------|
| | 3C0h | Open | Open | Open | Open |Closed |Closed |
|---+------+--------+--------+-------+-------+-------+-------|
| | 3D0h | Open | Open | Open | Open |Closed | Open |
|---+------+--------+--------+-------+-------+-------+-------|
| | 3E0h | Open | Open | Open | Open | Open |Closed |
|---+------+--------+--------+-------+-------+-------+-------|
| | 3F0h | Open | Open | Open | Open | Open | Open |
|------------------------------------------------------------|
| Note: A total of 64 base address settings are |
| available. The jumpers are a binary representation of |
| the decimal memory addresses. JP2/A is the Most |
| Significant Bit and jumper JP2/F is the Least |
| Significant Bit. The jumpers have the following decimal|
| values: JP2/A=512, JP2/B=256, JP2/C=128, JP2/D=64, |
| JP2/E=32, JP2/E=16. Open the jumpers and add the values|
| of the jumpers that are open to obtain the correct |
| memory address. (Open=1, Closed=0) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| WAIT STATES |
|------------------------------------------------------------|
| Setting | JP3/A | JP3/B | JP3/C |
|---------------+--------------+--------------+--------------|
| 0 | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 1 | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 2 | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| The function of the LED is unidentified. |
+------------------------------------------------------------+