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BDFC: Set Default Screen Position
Used by the routines at ScrollScreen and Handler_UserInput.
Park the cursor at the top-left of the text window.
SetDefaultScreenPosition BDFC CALL SwitchToNormalScreenOutput Call SwitchToNormalScreenOutput to select the screen channel.
BDFF LD BC,$0321 Park the cursor at column 21 of row 03.
BE02 CALL $0DD9 Call CL_SET.
BE05 RET Return.
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