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1F8D: get_hex: Get a hexadecimal keypress.
Used by the routine at enter_page.
get_hex 1F8D CALL get_hex_digit Get a keypress 1-9 or A-F.
1F90 INC HL Write key code to next byte of page display buffer.
1F91 LD (HL),A
1F92 CP $41 Return if key code is less than 'A'.
1F94 RET C
1F95 ADD A,$09 Else add 9 to keycode and return.
1F97 RET
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