INT 41 - SYSTEM DATA - HARD DISK 0 PARAMETER TABLE ADDRESS [NOT A VECTOR!]
Notes:	the default parameter table array is located at F000h:E401h in 100%
	  compatible BIOSes; the pointer may be overridden by the hard disk
	  controller's 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. to support drive formats unknown to the ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. 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.
	not used by some PS/2IBM PS/2, any model models
	BIOSes which support four hard drives may store the parameter tables
	  for drives 81h-83h immediately following the parameter table pointed
	  at by INT 41, with a separate copy of the drive 81h table for INT 46.
	  The check for such an arrangement is to test whether INT 46 points
	  somewhere other than exactly 16 bytes past INT 41, and the sixteen
	  bytes starting at offset 10h from INT 41 are identical to the sixteen
	  bytes pointed at by INT 46
	another arrangement for BIOSes which support four IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself.	 See also ESDI. drives is to have
	  four tables pointed at by INT 41 in the order primary master,
	  primary slave, secondary master, and secondary slave, in which case
	  (for example) a system with only primary master and secondary master
	  will have valid tables at offsets 00h and 20h, with garbage (but
	  sectors-per-track = 00h) at offsets 10h and 30h
SeeAlso: #03196,INT 13/AH=09h,INT 1E,INT 46"HARD DISK 1",INT 60"Adaptec"
SeeAlso: INT C0"AMIAmerican Megatrends, Inc.(American Megatrends, Inc.) A hardware, software and firmware company founded in 1985."


Format of fixed disk parameters:
Offset	Size	Description	(Table 03196)
 00h	WORD	number of cylinders
 02h	BYTE	number of heads
 03h	WORD	starting reduced write current cylinder (XTIBM PC XT only, 0 for others)
 05h	WORD	starting write precompensation cylinder number
 07h	BYTE	maximum ECC burst length (XTIBM PC XT only)
 08h	BYTE	control byte (see #03197,#03198)
 09h	BYTE	standard timeout (XTIBM PC XT only, 0 for others)
 0Ah	BYTE	formatting timeout (XTIBM PC XT and WD1002 only, 0 for others)
 0Bh	BYTE	timeout for checking drive (XTIBM PC XT and WD1002 only, 0 for others)
 0Ch	WORD	cylinder number of landing zone (ATIBM PC AT and later only)
 0Eh	BYTE	number of sectors per track (ATIBM PC AT and later only)
 0Fh	BYTE	reserved
SeeAlso: #00273,#00277


Bitfields for XTIBM PC XT fixed disk control byte:
Bit(s)	Description	(Table 03197)
 2-0	drive step speed
	000  3ms
	100  200ms
	101  70ms (default)
	110  3ms
	111  3ms
 5-3	unused
 6	disable ECC retries
 7	disable access retries


Bitfields for ATIBM PC AT fixed disk control byte:
Bit(s)	Description	(Table 03198)
 0	unused
 1	reserved (0)  (disable IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.)
 2	reserved (0)  (no reset)
 3	set if more than 8 heads
 4	always 0
 5	set if manufacturer's defect map on max cylinder+1  (ATIBM PC AT and later only)
 6	disable ECC retries
 7	disable access retries