Tandy 1000 SL Technical Reference Manual page 535

Software
Write Attribute or Color/Charac ter
Write a character and its attribute or color at the current cursor posi-
tion.
Entry Conditions
AH
=
9
BH
CX
AL
=
character to write
BL
=
displaypage number (not used in graphics modes)
=
number o f characters to write
=
attribute of character (for alpha modes) or color of
character (for graphics modes. If Bit 7 of BL is set, the
color of the character is XOR'ed with the color value).
See "Scroll Up" (AH
=
6) for attribute values and "Set
Color Palette" (AH
=
OBH) for color values.
Write Character Only
Write character only at current cursor position.
Entry Conditions
AH
=
OAH
BH
CX
AL
=
character to write
BL
=
displaypage number (valid for alpha modes only)
=
number of characters to write
=
color of character (graphics mode)
1 4 .