Routines
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49728: Validate Keypress
Used by the routines at PrintScreenCharacter and GetKeypress.
Checks the keypress and rejects a key the game does not use.
ValidateKeypress 49728 CP 97 Return if it is below 97.
49730 RET C
49731 CP 123 Return if it is at least 123.
49733 RET NC
49734 AND %01011111 Convert the lower-case letter to upper case.
49736 RET Return.
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