| Routines

869F: Give two chances to enter a correct code

Used by the routine at 8400.
869F | LD HL,$4000 | Clear the display file and attribute file
86A2 | LD DE,$4001
86A5 | LD BC,$1AFF
86A8 | LD (HL),$00
86AA | LDIR
86AC | LD IX,$858B | Point IX at the message at 858B ("Enter Code at grid location ")
86B0 | CALL $86C3 | Display the code entry screen and collect a four-digit code from the user
86B3 | JP Z,$87CA | Start the game if the code is correct
86B6 | LD IX,$85AB | Point IX at the message at 85AB ("Sorry, try code at location ")
86BA | CALL $86C3 | Display the code entry screen and collect another four-digit code from the user
86BD | JP Z,$87CA | Start the game if the code is correct
86C0 | JP $0000 | Otherwise reset the machine