Specifications

Theory of Operation
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CTRL+ALT+DEL
This keyboard sequence is called a "warm boot". The EPC does not
reinitialize all of the processor's hardware. The power-on self-test does not
run. However, the operating system will be reloaded. This type of reset
typically only works under DOS.
Additional abnormal conditions that cause a reset
Low Vcc
No DRAM refresh signal from the micromonitor
EXM Expansion Interface
The EXM expansion interface is electrically similar to the PC/AT ISA (16-bit data)
bus. The expansion interface is provided on both sides of the edge connector on the
rear of the EPC. See Chapter 4, Connectors for details of the signals provided.
Watchdog Timer
The EPC-21 & 22 use the secondary 8254 timer in the 82360SL chipset to implement
a watchdog timer function. Counter 2 within the 8254 is/should be programmed to
reset the CPU when half of the timer's initial count has expired.
See Appendix B for details on programming the watchdog timer.