1.11.46.24 Model 76, 77 (9576, 9577) System Board
- 1 Pointing-device connector (J1)
- 2 Keyboard connector (J2)
- 3 Parallel-port connector (J3)
- 4 Serial-port connector 1 (J4)
- 5 Serial-port connector 2 (J5)
- 6 Oscillator-select jumper (SPD)
- (25 MHz systems only)
- 7 Option microprocessor socket (U49)
- (25 MHz and 33 MHz systems only)
- 8 External SCSI connector (J6)
- 9 Internal SCSI connector (J7)
- 10 Control-panel connector (J19)
- 11 Power-supply connector P2 (J18)
- 12 Power-supply connector P1 (J17)
- 13 Diskette-drive connector (J21)
- 14 Bus-adapter connector (J13)
- 15 Password-override connector (JMP1)
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