Routines
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47766: Switch To Upper Screen
Used by the routines at ClearScreen, ClearLines, SetDefaultScreenPosition, SetScreenPosition, PrintString, Print_RoomGraphic, Handler_UserInput and UserInput_Enter.
SwitchScreenUpper 47766 PUSH HL Stash HL, DE, BC and AF on the stack.
47767 PUSH DE
47768 PUSH BC
47769 PUSH AF
47770 LD A,2 Switch to upper screen using CHAN_OPEN.
47772 CALL 5633
47775 POP AF Restore AF, BC, DE and HL from the stack.
47776 POP BC
47777 POP DE
47778 POP HL
47779 RET Return.
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