Routines
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9F13: XOR two unshifted bytes: the draw path's plot for a thing on a cell boundary
Where DRAW_JR lands when no shift is needed; the same as ERASE_UNSHIFTED.
DRAW_UNSHIFTED 9F13 EX DE,HL
9F14 EX (SP),HL
9F15 LD A,D
9F16 XOR (HL)
9F17 LD (HL),A
9F18 INC L
9F19 LD A,E
9F1A XOR (HL)
9F1B LD (HL),A
9F1C POP DE
9F1D DEC L
9F1E JP SCREEN_ROW_UP
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