ISR_XMODE         100 dev/ic/com.c   #define ISR_SEND	(ISR_RXPL | ISR_XMODE | ISR_XMITIR)
ISR_XMODE         101 dev/ic/com.c   #define ISR_RECV	(ISR_RXPL | ISR_XMODE | ISR_RCVEIR)
ISR_XMODE         100 dev/ic/com_subr.c #define ISR_SEND	(ISR_RXPL | ISR_XMODE | ISR_XMITIR)
ISR_XMODE         101 dev/ic/com_subr.c #define ISR_RECV	(ISR_RXPL | ISR_XMODE | ISR_RCVEIR)