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0:400h                   RS-232 Communications Line Port Base Addresses
0:408h                   Parallel Printer Port Base Addresses
0:410h                   Equipment List
0:412h                   Reserved (POST Status on PC Convertible)
0:413h                   Memory Size in Kilobytes (0-640)
0:415h                   Reserved (PC Convertible Battery Status)
0:417h                   Shift Status
0:418h                   Extended Shift Status
0:419h                   Alternate Keypad Entry
0:41Ah                   Keyboard Buffer Head Pointer
0:41Ch                   Keyboard Buffer Tail Pointer
0:41Eh                   Keyboard Buffer
0:43Eh                   Diskette Drive Recalibrate Status
0:43Fh                   Diskette Drive Motor Status
0:440h                   Motor Off Counter
0:441h                   Last Diskette Drive Operation Status
0:442h                   Diskette Drive Controller Status information
0:449h                   Display mode
0:44Ah                   Number of Columns in Current mode
0:44Ch                   Length of Regen Buffer
0:44Eh                   Starting Address of Regen Buffer
0:450h                   Cursor Position (Column, Row) for Display Pages
0:460h                   Cursor End Scan Line and Start Scan Line
0:462h                   Current Display Page
0:463h                   CRT Controller Base Address
0:465h                   Current Setting of the Mode Control Register
0:466h                   Current setting of the Color Select Register (port 3x
0:467h                   Reserved
0:46Ch                   Long integer with Timer Counter
0:470h                   Timer Overflow flag
0:471h                   Break Key State
0:472h                   Reset State Flag
0:474h                   Last Fixed Disk Operation Status
0:475h                   Number of Fixed Disks
0:476h                   Reserved
0:477h                   Reserved
0:478h                   Time-Out Values for Parallel Printers
0:47Ch                   Time-Out Values for RS-232 Communications Lines
0:480h                   Keyboard Buffer Start Offset Pointer
0:482h                   Keyboard Buffer End Offset Pointer
0:484h                   Number of Rows on display, minus 1
0:485h                   Character height
0:487h                   Video Control States
0:489h                   Reserved
0:48Bh                   Diskette Media Control
0:48Ch                   Fixed Disk Controller Status
0:48Dh                   Fixed Disk Controller Error Status
0:48Eh                   Fixed Disk Interrupt Control
0:48Fh                   Reserved
0:490h                   Diskette Drive 0 Media State
0:491h                   Diskette Drive 1 Media State
0:492h                   Reserved
0:494h                   Drive 0 Current Track
0:495h                   Drive 1 Current Track
0:496h                   Keyboard Status and Type Flags
0:497h                   Keyboard LED Status
0:498h                   Double-Word Pointer to User Wait Complete Flag
0:49Ch                   Long Integer with User Wait Count (Microseconds)
0:4A0h                   Wait Active Flag
0:4A1h                   Reserved
0:4A8h                   Double-Word Pointer to Video Parameters for the EGA
0:4ACh                   Reserved
0:4F0h                   Intra-Application Communications Area (ICA)
0:500h                   Print Screen Status Byte
0:501h                   Reserved
0:504h                   Phantom drive flag
0:505h                   Reserved
F000:FFF0h               FAR JMP to Beginning of Power-On Self Test (POST)
F000:FFF5h               ROM BIOS Release Date, in ASCII
F000:FFFCh               Reserved
F000:FFFEh               System Model ID