Chicago Gaming Nicktoons Racing - Manual (Page 17)

7. Watch Dog and the I/O board
The I/O board contains solenoid drivers, audio amplifier, and a watch dog circuit (to reset the PC if the PC gets
locked). The CPU reset signal (Reset#) is accessed via a connector on the mother board.
Table 12, ASRock M810LMR Mother board, System panel connector
The 2 pin watch dog connector is plugged into this connector on the top pins reset# and GND, (reset# is
connected to the purple wire, GND is the empty pin).
The Watch Dog circuit also receives signals from parallel port (DB25 connector) and it is plugged into the
parallel port connector.
7.1. The Watch Dog (or WDT)
There are 3 switches (S1, S2, & S3) and 3 LED’s (CR1, CR2, & CR3).
Switch S1 - Enable/Disable watch dog
Switch S2 - Reset the PC.
Switch S3 - Set power on “watch dog reset counter” to 0.
Green LED CR1 – power on “reset counter” (medium ¾ sec blinks,
Heartbeat (slow 1 second blinks) ,
or CPU Reset active (fast ½ sec blinks)
Red LED CR2 - Watch dog disabled (when solid on),
2 blink rates when watch dog is being petted.
LED CR3 – Not used
When the game is turned on, the Green LED CR1 blinks the amount of times the watch dog circuit has reset the
game (Note: switches do not operate during this state). If this “watch dog reset counter” is zero, it blinks both
CR1 (Green) & CR2 (Red) one at a time. In state 2 and 3. the switches are continuously monitored when LED
CR1 blinks at the heartbeat rate (Regular, 1 beat/second), except where noted.
Pressing (and holding) Switch S1 will toggle between the Enable (Red LED CR2 blinking or off) or disable
(Red LED CR2 is solid on). Note: The disabled state of watch dog is “remembered” even when power is turned
off, then on again. So it is possible to never enable watch dog.
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Page 17