These BitBlts are used when drawing text in the software-drawing code. The principle difference between software-drawing mode and hardware-drawing mode routines in FFBLTPD.ASM is that text blts are from bottom-left to top-right, while pattern blts are from top-left to bottom-right. These routines are also optimized for text. The following routines handle monochrome expansion with both a
foreground and background mix:

FFBLTPX.ASM
eddf_MESSPatExp16
eddf_MESSPatExp81
eddf_MESSPatExp24
eddf_MESSPatExp41
eddf_MESSPatExp11
The following routines handle monochrome expansion with a foreground mix
and transparent background:

eddf_MESSPatExpFg16
eddf_MESSPatExpFg81
eddf_MESSPatExpFg24
eddf_MESSPatExpFg41
eddf_MESSPatExpFg11