0040h:0000h RS-232 Communications Line Port Base Addresses
0040h:0008h Parallel Printer Port Base Addresses
0040h:0010h Equipment List
0040h:0012h Reserved (POST Status on PC Convertible)
0040h:0013h Memory Size
0040h:0015h Reserved (PC Convertible Battery Status)
0040h:0017h Shift Status
0040h:0018h Extended Shift Status
0040h:0019h Alt-Keypad Entry
0040h:001Ah Keyboard Buffer Head Pointer
0040h:001Ch Keyboard Buffer Tail Pointer
0040h:001Eh Keyboard Buffer
0040h:003Eh Diskette Drive Recalibrate Status
0040h:003Fh Diskette Drive Motor Status
0040h:0040h Motor Off Counter
0040h:0041h Last Diskette Drive Operation Status
0040h:0042h Diskette Drive Controller Status
0040h:0049h Display Mode
0040h:004Ah Number of Columns in Current Mode
0040h:004Ch Length of Regeneration Buffer
0040h:004Eh Starting Address of Regeneration Buffer
0040h:0050h Cursor Position (Column, Row) for Display Pages
0040h:0060h Cursor End Scan Line and Start Scan Line
0040h:0062h Current Display Page
0040h:0063h CRT Controller Base Address
0040h:0065h Current Setting of Mode Control Register
0040h:0066h Current Setting of Color Select Register (3x9h)
0040h:0067h Reserved
0040h:006Ch Long Integer with Timer Counter
0040h:0070h Timer Overflow Flag
0040h:0071h Break Key State
0040h:0072h Reset State Flag
0040h:0074h Last Fixed Disk Operation Status
0040h:0075h Number of Fixed Disks
0040h:0076h Reserved
0040h:0077h Reserved
0040h:0078h Time-Out Values for Parallel Printers
0040h:007Ch Time-Out Values for RS-232 Communications Lines
0040h:0080h Keyboard Buffer Start Offset Pointer
0040h:0082h Keyboard Buffer End Offset Pointer
0040h:0084h Number of Rows on Display, minus 1
0040h:0085h Character Height
0040h:0087h Video Control States
0040h:0089h Reserved
0040h:008Bh Diskette Media Control
0040h:008Ch Fixed Disk Controller Status
0040h:008Dh Fixed Disk Controller Error Status
0040h:008Eh Fixed Disk Interrupt Control
0040h:008Fh Reserved
0040h:0090h Diskette Drive 0 Media State
0040h:0091h Diskette Drive 1 Media State
0040h:0092h Reserved
0040h:0094h Drive 0 Current Track
0040h:0095h Drive 1 Current Track
0040h:0096h Keyboard Status and Type Flags
0040h:0097h Keyboard LED Status
0040h:0098h Double-Word Pointer to User Wait Complete Flag
0040h:009Ch Long Integer with User Wait Count (Microseconds)
0040h:00A0h Wait Active Flag
0040h:00A1h Reserved
0040h:00A8h Double-Word Pointer to Video Parameters for EGA
0040h:00ACh Reserved
0040h:00F0h Intra-Application Communications Area (ICA)
0050h:0000h Print Screen Status Byte
0050h:0001h Reserved
0050h:0004h Phantom Drive Flag
0050h:0005h Reserved
FFFFh:0000h FAR JMP to Beginning of Power-On Self Test (POST)
FFFFh:0005h ROM BIOS Release Date, in ASCII
FFFFh:000Ch Reserved
FFFFh:000Eh System Model ID