Bitfields for Connection CoProcessor switch states:
Bit(s)	Description	)
 7	reserved
 6	unused
 5	spare switch open
 4	FAX ADR1 switch open
 3	FAX ADR0 switch open
 2	alternate interrupt switch open
 1	COM SEL 1 switch open
 0	COM SEL 0 switch open
Note:	valid combinations of 0-2 are
	000  COM2 IRQ3 IObase 2F8h
	001  COM1 IRQ4 IObase 3F8h
	010  COM4 IRQ3 IObase 2E8h
	011  COM3 IRQ4 IObase 3E8h
	110  COM4 IRQ2 IObase 2E8h
	111  COM3 IRQ5 IObase 3E8h