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34463: Give two chances to enter a correct code
Used by the routine at 33792.
34463 LD HL,16384 Clear the display file and attribute file
34466 LD DE,16385
34469 LD BC,6911
34472 LD (HL),0
34474 LDIR
34476 LD IX,34187 Point IX at the message at 34187 ("Enter Code at grid location     ")
34480 CALL 34499 Display the code entry screen and collect a four-digit code from the user
34483 JP Z,34762 Start the game if the code is correct
34486 LD IX,34219 Point IX at the message at 34219 ("Sorry, try code at location     ")
34490 CALL 34499 Display the code entry screen and collect another four-digit code from the user
34493 JP Z,34762 Start the game if the code is correct
34496 JP 0 Otherwise reset the machine
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