Routines
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49820: Scroll Screen Down
Used by the routine at HandleBackspaceKey.
ScrollScreenDown 49820 PUSH HL Stash HL, DE and BC on the stack.
49821 PUSH DE
49822 PUSH BC
49823 LD HL,20703 HL=20703 (screen buffer location).
49826 LD DE,20735 DE=20735 (screen buffer location).
49829 LD A,8 A=8.
ScrollScreenDown_0 49831 PUSH HL Stash HL and DE on the stack.
49832 PUSH DE
49833 LD BC,128 BC=0128.
49836 LDDR LDDR.
49838 POP DE Restore DE and HL from the stack.
49839 POP HL
49840 INC H Increment H by one.
49841 INC D Increment D by one.
49842 DEC A Decrease A by one.
49843 JR NZ,ScrollScreenDown_0 Jump to ScrollScreenDown_0 if A is not equal to 8.
49845 LD HL,20576 HL=20576 (screen buffer location).
49848 JR ScrollScreenUp_1 Jump to ScrollScreenUp_1.
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