Category: other operating systems
Flags: callout or callback (usually hooked rather than called)

INT E6 - CP/M-86 v1.1 - XIOS INTERRUPT / UNKNOWN DISK DRIVE

	AX = function which accessed drive
	    0000h SELDSK
	    0001h READ
	    0002h WRITE
	    0003h HOME
	DX:BX -> parameter block (see #04063)
Return:	AX = return value
Desc:	called by CP/M-86 kernel when an unknown disk drive is used, which
	  permits an application to provide access services
Note:	This was labelled "XIOS interrupt" in later Digital Research
	  documentation (CCP/M-86) and "for the version 1.0 back door".