Routines
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BA96: Switch To Upper Screen
Used by the routines at ClearScreen, ClearLines, SetDefaultScreenPosition, SetScreenPosition, PrintString, Print_RoomGraphic, Handler_UserInput and UserInput_Enter.
SwitchScreenUpper BA96 PUSH HL Stash HL, DE, BC and AF on the stack.
BA97 PUSH DE
BA98 PUSH BC
BA99 PUSH AF
BA9A LD A,$02 Switch to upper screen using CHAN_OPEN.
BA9C CALL $1601
BA9F POP AF Restore AF, BC, DE and HL from the stack.
BAA0 POP BC
BAA1 POP DE
BAA2 POP HL
BAA3 RET Return.
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