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65170: Perform a shade
Used by the routines at SHADE_ROUTINE and 65306.
PERFORM_SHADE 65170 CALL CALC_RELATIVE_OFFSETS Calculate offsets
65173 PUSH BC
65174 LD A,12
65176 LD (65128),A Rewrite code to use 'INC C' instruction in routine
65179 CALL DO_SHADE
65182 POP BC
65183 DEC C
65184 LD A,13
65186 LD (65128),A Rewrite code to use 'DEC C' instruction in routine
65189 CALL DO_SHADE
65192 EI Re-enable interrupts
65193 JP SKIP_4_THEN_NEXT Skip 4 bytes to next graphics instruction
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