Routines
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EB46: Check for "jump" on Interface 2
Used by the routine at EB1A.
EB46 LD A,$F7 Scan top left of the keyboard.
EB48 IN A,($FE)
EB4A BIT 4,A Return if '5' was not pressed.
EB4C RET NZ
EB4D JP $66C3 Otherwise move to the jump routine.
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