INT E6 C - CP/M-86One of the three operating systems offered by IBMInternational Busiuness Machines for its original PCIBM PC (the other two were MSDOS and the UCSD p-System).  It has since evolved into DR-DOS version 6 and Novell DOS 7. 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-86One of the three operating systems offered by IBMInternational Busiuness Machines for its original PCIBM PC (the other two were MSDOS and the UCSD p-System).  It has since evolved into DR-DOS version 6 and Novell DOS 7. 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".


Format of CP/M-86One of the three operating systems offered by IBMInternational Busiuness Machines for its original PCIBM PC (the other two were MSDOS and the UCSD p-System).  It has since evolved into DR-DOS version 6 and Novell DOS 7. unknown-drive paramter block:
Offset	Size	Description	(Table 04063)
 00h	BYTE	drive number (00h = first unknown drive, etc.)
 01h	BYTE	deblocking flag (00h = normal write, 01h = directory write)
 02h	WORD	track number
 04h	WORD	sector number
 06h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	data transfer address
 0Ah	BYTE	verify flag (nonzero to verify writes)
Note:	in CP/M-86One of the three operating systems offered by IBMInternational Busiuness Machines for its original PCIBM PC (the other two were MSDOS and the UCSD p-System).  It has since evolved into DR-DOS version 6 and Novell DOS 7. v1.1, this is actually a portion of a BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. disk data
	  table which starts one byte before the address given to the INT E6
	  handler; that extra byte is the current logical drive number