PutChar & GetChar

[Tim]

If you don't care about colour or position:

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mov ah, 0Ah
mov al, the_character
xor bx, bx
mov cx, 1
int 10h

If you want to specify the colour:

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mov ah, 09h
mov al, the_character
mov bx, colour_code
mov cx, 1
int 10h

If you want to write a character and increment the cursor (like putch() in C):

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mov ah, 0Eh
mov al, the_character
mor bx, bx
int 10h

All of these methods use the BIOS, so clearly they won't work in protected mode.