ASCII/IBM PC Keyboard Scan Codes

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For many of the special key combinations such as ALT-A, F1, PgUp, and so forth, the IBM PC uses a special two-character escape sequence. Depending on the programming language being used and the level at which the keyboard is being accessed, the escape character is either ESC (27, 0x1B), or NUL (0). Here are some common sequences:

Char. Decimal Pair Hex Pair Char. Decimal Pair Hex Pair
ALT-A (00,30) (0x00,0x1e) ALT-B (00,48) (0x00,0x30)
ALT-C (00,46) (0x00,0x2e) ALT-D (00,32) (0x00,0x20)
ALT-E (00,18) (0x00,0x12) ALT-F (00,33) (0x00,0x21)
ALT-G (00,34) (0x00,0x22) ALT-H (00,35) (0x00,0x23)
ALT-I (00,23) (0x00,0x17) ALT-J (00,36) (0x00,0x24)
ALT-K (00,37) (0x00,0x25) ALT-L (00,38) (0x00,0x26)
ALT-M (00,50) (0x00,0x32) ALT-N (00,49) (0x00,0x31)
ALT-O (00,24) (0x00,0x18) ALT-P (00,25) (0x00,0x19)
ALT-Q (00,16) (0x00,0x10) ALT-R (00,19) (0x00,0x13)
ALT-S (00,31) (0x00,0x1a) ALT-T (00,20) (0x00,0x14)
ALT-U (00,22) (0x00,0x16) ALT-V (00,47) (0x00,0x2f)
ALT-W (00,17) (0x00,0x11) ALT-X (00,45) (0x00,0x2d)
ALT-Y (00,21) (0x00,0x15) ALT-Z (00,44) (0x00,0x2c)
PgUp (00,73) (0x00,0x49) PgDn (00,81) (0x00,0x51)
Home (00,71) (0x00,0x47) End (00,79) (0x00,0x4f)
UpArrw (00,72) (0x00,0x48) DnArrw (00,80) (0x00,0x50)
LftArrw (00,75) (0x00,0x4b) RtArrw (00,77) (0x00,0x4d)
F1 (00,59) (0x00,0x3b) F2 (00,60) (0x00,0x3c)
F3 (00,61) (0x00,0x3d) F4 (00,62) (0x00,0x3e)
F5 (00,63) (0x00,0x3f) F6 (00,64) (0x00,0x40)
F7 (00,65) (0x00,0x41) F8 (00,66) (0x00,0x42)
F9 (00,67) (0x00,0x43) F10 (00,68) (0x00,0x44)
F11 (00,133) (0x00,0x85) F12 (00,134) (0x00,0x86)
ALT-F1 (00,104) (0x00,0x68) ALT-F2 (00,105) (0x00,0x69)
ALT-F3 (00,106) (0x00,0x6a) ALT-F4 (00,107) (0x00,0x6b)
ALT-F5 (00,108) (0x00,0x6c) ALT-F6 (00,109) (0x00,0x6d)
ALT-F7 (00,110) (0x00,0x6e) ALT-F8 (00,111) (0x00,0x6f)
ALT-F9 (00,112) (0x00,0x70) ALT-F10 (00,113) (0x00,0x71)
ALT-F11 (00,139) (0x00,0x8b) ALT-F12 (00,140) (0x00,0x8c)

Hint - If you look at how the keys are laid out on the keyboard, you'll probably see the pattern.

Related Columns: Computer Dictionary, Morse Code

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