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EB50: Check for "jump" on Protek Interface
Used by the routine at EB38.
EB50 LD A,$EF Scan top right of the keyboard.
EB52 IN A,($FE)
EB54 BIT 0,A Return if '0' was not pressed.
EB56 RET NZ
EB57 JP $66C3 Otherwise move to the jump routine.
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