Tandy 1000 SL Technical Reference Manual page 534

BIOS Services
Scroll Down
Scroll active page down.
Entry Conditions
AH
=
7
AL
=
number o f lines to scroll (0
=
blank entire window)
CH
=
row of upper left corner of scroll window
CL
=
column of upper left comer of scroll window
DH
=
row of lower right corner of scroll window
DL
=
column of lower right corner of scroll window
BH
=
attribute (alpha modes) of color (graphics modes)
to be used on blank line. See "Scroll Up" (AH
=
6) for at-
tribute values and "Set Color Palette" (AH
=
11) for
color values.
Read Attribute or Color/Character
Read a character and its attribute or color at the current cursor posi-
tion.
Entry Conditions
AH
=
8
BH
=
displaypage number (not used in graphics modes)
Exit Conditions
AL
=
characterread
AH
=
attribute of character (alpha modes only)
13.