Routines
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8FC5: Draw the portal, or move to the next cavern if Willy has entered it
 Used by the routine at 870E. First check whether Willy has entered the portal. 8FC5 LD HL,(\$80B0) Pick up the address of the portal's location in the attribute buffer at 5C00 from 80B0 8FC8 LD A,(\$806C) Pick up the LSB of the address of Willy's location in the attribute buffer at 5C00 from 806C 8FCB CP L Does it match that of the portal? 8FCC JR NZ,\$8FDF Jump if not 8FCE LD A,(\$806D) Pick up the MSB of the address of Willy's location in the attribute buffer at 5C00 from 806D 8FD1 CP H Does it match that of the portal? 8FD2 JR NZ,\$8FDF Jump if not 8FD4 LD A,(\$808F) Pick up the portal's attribute byte from 808F 8FD7 BIT 7,A Is the portal flashing? 8FD9 JR Z,\$8FDF Jump if not 8FDB POP HL Drop the return address from the stack 8FDC JP \$9028 Move Willy to the next cavern Willy has not entered the portal, or it's not flashing, so just draw it. 8FDF LD A,(\$808F) Pick up the portal's attribute byte from 808F 8FE2 LD (HL),A Set the attribute bytes for the portal in the buffer at 5C00 8FE3 INC HL 8FE4 LD (HL),A 8FE5 LD DE,\$001F 8FE8 ADD HL,DE 8FE9 LD (HL),A 8FEA INC HL 8FEB LD (HL),A 8FEC LD DE,\$8090 Point DE at the graphic data for the portal at 8090 8FEF LD HL,(\$80B2) Pick up the address of the portal's location in the screen buffer at 6000 from 80B2 8FF2 LD C,\$00 C=0: overwrite mode This routine continues into the one at 8FF4.
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