Routines
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074C: print_double_column_0: Write 4 pixel rows of double height character data over 8 pixel rows at column that is a multiple of 4.
Used by the routine at print_half_row.
Input
DE holds address of pixel row n of character font bitmap.
HL holds screen address to print character at.
print_double_column_0 074C CALL print_column_0 Call print_column_0 with B set to 1 to print pixel row n+0 of character.
074F DEC DE Decrement DE and call print_column_0 with B set to 2 to print pixel rows n+0 and n+1 of character.
0750 LD B,$02
0752 CALL print_column_0
0755 DEC DE Decrement DE and call print_column_0 with B set to 2 to print pixel rows n+1 and n+2 of character.
0756 LD B,$02
0758 CALL print_column_0
075B DEC DE Decrement DE and call print_column_0 with B set to 2 to print pixel rows n+2 and n+3 of character.
075C LD B,$02
075E CALL print_column_0
0761 DEC DE Decrement DE and jump to print_column_0 with B set to 1 to print pixel row n+3 of character.
0762 INC B
0763 JP print_column_0
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