cpu 8086
[BITS 16]			;In 16 Bit mode
[org 0x7C00]		;Originating at 0x7C00 (where bios loads it to)
CALL GetKey			;Call BIOS procedure to obtain character from keyboard
CALL PrintCharacter	;Call bios procedure to write the obtained key
JMP $				;Infinite loop as end of program

PrintCharacter:
MOV AH,0x0E			;AH = 0x0E means teletype output for interrupt 0x10 (display output)
MOV BH,0x00			;Page number 0 for the cursor position for interrupt 0x10
MOV BL,0x07			;Light grey font on black background
INT 0x10			;Call video interrupt
RET					;Return from PrintCharacter

GetKey:
MOV AH,0x00			;Bios scan code
INT 0x16			;Call keyboard interrupt
RET					;Return from getkey

TIMES 510 - ($ - $$) db 0 ;Fill the rest of the sector with 0
DW 0xAA55		;boot signiature at end of bootloader