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948A: Move Willy into the room to the left
Used by the routine at 8FBC.
948A LD A,($80E9) Pick up the number of the room to the left from 80E9
948D LD ($8420),A Make it the current room number by copying it to 8420
9490 LD A,($85D3) Adjust Willy's screen x-coordinate (at 85D3) to 30 (on the far right)
9493 OR $1F
9495 AND $FE
9497 LD ($85D3),A
949A POP HL Drop the return address (89D1, in the main loop) from the stack
949B JP $8912 Draw the room and re-enter the main loop
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