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37782: Clear top two thirds of display file and draw two rows of [SPACE] characters below
37782 LD HL,20480 Point HL two thirds of the way down display file
37785 LD (36488),HL Store this address at 36488
37788 LD HL,64 Set width to 64
37791 LD A,32 Set window border style character to 32 (a SPACE character)...
37793 LD (36912),A ...
37796 CALL 36908 Draw upper edge of frame of a window
37799 LD HL,0 Load zero (all bits reset) into HL
37802 LD BC,8 Load 0 into B and 8 into C to repeat outer loop 8 times
37805 DI Disable interrupts
37806 LD (37837),SP Store stack pointer at 37837
37810 LD SP,20480 Point stack pointer two thirds of the way down display file
37813 JP 37830 Jump into clearing routine
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