Tandy 600 Programmer's Reference Manual page 20

FUNCTION
08h
-
Read Keyboard
Without
Echo
AX
BX
CX
DX
SP:
BP:
SI:
Dl:
IP:
FLG
CS
DS
SS
ES
XXXXXXXX
XXXXXXXX
Entry:
AH
=
08h
(function
code)
Exit:
AX =
Character from keyboard
Function
08h
waits for
a
character
to
be
typed
on
the
keyboard,
and then returns
it
in
AX.
The
typed character
is
not
echoed
to
the
LCD
display.
15