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47833: Clear lower two thirds, and lower three character rows of upper third of display file
Used by the routine at 38841.
47833 LD HL,16544 Load HL with display file address corresponding to (0, 5) (characters)
47836 LD (63018),HL ...and move bitmap virtual text cursor here
47839 LD HL,96 Load HL with 96 (repeat count)
47842 LD A,32 Load A with 32 (character code for SPACE)...
47844 LD (63306),A ...and store at 63306
47847 CALL 63302 Draw three rows of SPACE characters and set HL to zero
47850 LD BC,8 Load B with 0 (repeat inner loop 256 times) and C with 8 (repeat outer loop 8 times)
47853 JP 47862 Clear lower two thirds of display file and return
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