Atari ST series Technical Reference Manual page 391

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BIOS function Bconin() (when used to read the console de

vice keyboard), both return a two-byte keycode, which is ex

tended into a longword. The first byte of the keycode, which

is found in the second byte of the longword, is usually a

unique key identifier that refers to the physical key that was

struck, regardless of shift-key combinations. The second

byte, which is found in the last byte of the longword, is usu

ally the ASCII value of the key combination, which does de

pend on the state of the shift keys (Shift, Control, and Alter

nate). The following table shows the keycodes, as four-digit

hexadecimal numbers, for all key and shift combinations.

function Cconin(), and the

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