INT 14 - I1541 - SEND SECONDARY ADDRESS FOR LISTEN                              
	AX = 4005h
	BL = channel number and mode (see #00355)
Return: CF clear if successful
	CF set on error
	    AL = error number (see #00354)
SeeAlso: AX=4004h,AX=4006h


Bitfields for I1541 channel number and mode:
Bit(s)	Description	(Table 00355)
 7-4	mode
	0110 read/write
	1110 close channel
	1111 open channel
 3-0	channel number