Appendix A Programming the Watchdog Timer ...... 117
A.1 Programming the Watchdog Timer .............................. 118
A.1.1 Watchdog timer overview ...................................... 118
A.1.2 Reset/ Interrupt selection ....................................... 118
A1.3 Programming the Watchdog Timer.......................... 118
A.1.4 Example Program................................................... 121
Appendix B Pin Assignments ................................... 127
B.1 IDE Hard Drive Connector (CN1, CN2)..................... 128
B.2 Floppy Drive Connector (CN3) .................................... 129
B.3 Parallel Port Connector (CN4)...................................... 130
B.4 SCSI Connector (CN5)................................................... 131
B.5 USB Connector (CN6) ................................................... 132
B.6 VGA Connector (CN7) ................................................... 132
B.7 Ethernet 10/100Base-T RJ-45 Connector
(CN8, CN34) ........................................................................... 133
B.8 COM1/COM2 RS-232 Serial Port (CN9, CN10) ....... 133
B.9 Keyboard and Mouse Connnector (CN11) ................. 134
B.10 External Keyboard Connector (CN12) ..................... 134
B.11 IR Connector (CN13) ................................................... 135
B.12 CPU Fan Power Connector (CN14) ........................... 135
B.13 Power LED and Keylock Connector (CN16) ........... 136
B.14 External Speaker Connector (CN17) ........................ 136
B.15 Reset Connector (CN18)............................................. 137
B.16 HDD LED Connector (CN19) .................................... 137
B.17 ATX Feature Connector (CN20) ................................ 137
B.18 ATX Soft Power Switch (CN21) .................................. 138
B.19 H/W Monitor Alarm (CN22) ....................................... 138
B.20 SM Bus Connector (CN23) ......................................... 138
B.21 Extension I/O Board Connector (CN27) .................. 139
B.22 Extension I/O Board Connector (CN28) .................. 139
B.23 PS/2 Mouse Connector (CN33) .................................. 140
B.24 System I/O Ports ........................................................... 141
B.25 DMA Channel Assignments ....................................... 142
B.26 Interrupt Assignments ................................................. 142
