
| DIGITAL AND OPTO PORTS | SECTION 6 | |||
| Table  | 
 | 
 | ||
| Pin # | 82C55 | Description | Opto | 
 | 
| 
 | 
 | 
 | Channel | 
 | 
| 19 | Port A, line 0 | 
 | 8 | 
 | 
| 21 | Port A, line 1 | 
 | 9 | 
 | 
| 23 | Port A, line 2 | 
 | 10 | 
 | 
| 25 | Port A, line 3 | 
 | 11 | 
 | 
| 24 | Port A, line 4 | 
 | 12 | 
 | 
| 22 | Port A, line 5 | 
 | 13 | 
 | 
| 20 | Port A, line 6 | 
 | 14 | 
 | 
| 18 | Port A, line 7 | 
 | 15 | 
 | 
| 10 | Port B, line 0 | High current | 16 | 
 | 
| 8 | Port B, line 1 | High current | 17 | 
 | 
| 4 | Port B, line 2 | High current | 18 | 
 | 
| 6 | Port B, line 3 | High current | 19 | 
 | 
| 1 | Port B, line 4 | High current | 20 | 
 | 
| 3 | Port B, line 5 | High current | 21 | 
 | 
| 5 | Port B, line 6 | High current | 22 | 
 | 
| 7 | Port B, line 7 | High current | 23 | 
 | 
| 13 | Port C, line 0 | Lower C | 0 | 
 | 
| 16 | Port C, line 1 | Lower C | 1 | 
 | 
| 15 | Port C, line 2 | Lower C | 2 | 
 | 
| 17 | Port C, line 3 | Lower C | 3 | 
 | 
| 14 | Port C, line 4 | Upper C | 4 | 
 | 
| 11 | Port C, line 5 | Upper C | 5 | 
 | 
| 12 | Port C, line 6 | Upper C | 6 | 
 | 
| 9 | Port C, line 7 | Upper C | 7 | 
 | 
| 26 | 
 | 
 | Ground | 
 | 
| 2 | 
 | 
 | + 5V | 
 | 
Figure 6-3  Digital I/O connector pin out (viewed from top)
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