PORTIBM PC Portable (uses same BIOS as XT) EDC0-EDC1 - DR DOS BATTERYMAX - DYNAMIC IDLE DETECTION
Note:	These ports are emulated by the IDLE386 dynamic idle detection of the
	  DR DOS BatteryMAX component. The actual definition of the bits is up
	  to the OEMs

EDC0  R-  emulated I/O address for video/serial activity status check
	  bit 6: screen RAM(Random Access Memory)	See also DRAM, SRAM. updated since last query
	  bit 1: COM2??? activity detected since last query
	  bit 0: COM1??? activity detected since last query
	  Note: Reading resets the IDLE386 video/serial internal setting
EDC1  -W  emulated I/O address for idle port
	  sets wakeup alarm on specified hardware event
	  bit 1: keyboard INT 09h
	  bit 0: timer INT 08h