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AH = 02h DL = character to write
Return:
AL = last character output (despite the official docs which state nothing is returned) (at least DOS 2.1-7.0)
Notes: ^C/^Break are checked, and INT 23 executed if pressed. Standard output is always the screen under DOS 1.x, but may be redirected under DOS 2+. The last character output will be the character in DL unless DL=09h on entry, in which case AL=20h as tabs are expanded to blanks. If standard output is redirected to a file, no error checks (write- protected, full media, etc.) are performed
Category: DOS Kernel - Int 21h - D
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