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37735: Move virtual text cursor from one third to another in display file
Used by the routines at 37703 and 37719.
37735 AND 224 Clear bits for 1, 2, 4, 8 and 16 (i.e. set to zero) to set cursor to beginning of new character row
37737 LD L,A Put value back into L
37738 LD A,H Get value of H
37739 ADD A,8 Increase by 8 (as we're moving one text row, or EIGHT pixel rows down)
37741 LD H,A Place modified value back into HL...
37742 LD (36488),HL ...and update stored value accordingly
37745 RET Return
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