| Clock Board Connector on SDSU | ||||
| (serial) | (parallel) | |||
| board 2 | board 3 | |||
| Pin | Name | address | address | |
| 1 | CLK 0 | 1 | ||
| 2 | CLK 1 | 2 | ||
| 3 | CLK 2 | 4 | ||
| 4 | CLK 3 | 8 | ||
| 5 | CLK 4 | $10 | ||
| 6 | CLK 5 | $20 | ||
| 7 | CLK 6 | $40 | ||
| 8 | CLK 7 | $80 | ||
| 9 | CLK 8 | $100 | ||
| 10 | CLK 9 | $200 | ||
| 11 | CLK 10 | $400 | ||
| 12 | CLK 11 | $800 | ||
| 13 | CLK 12 | 1 | ||
| 14 | CLK 13 | 2 | ||
| 15 | CLK 14 | 4 | ||
| 16 | CLK 15 | 8 | ||
| 17 | CLK 16 | $10 | ||
| 18 | CLK 17 | $20 | ||
| 19 | CLK 18 | $40 | ||
| 24 | GND | |||
| 25 | GND |