Tandy 600 Programmer's Reference Manual page 70

Bios programmers
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FUNCTION DEh
-
Set
Alarm Date/Time
AX
XXXXXXXX
XXXXXXXX
Entry:
Exit;
AH
=
DEh
(function
code)
BX
XXXXXXXX
XXXXXXXX
AL =
Alarm
type
code
=
Restart
alarm
CX
XXXXXXXX
XXXXXXXX
1
=
Annunciator alarm
DX
XXXXXXXX
XXXXXXXX
BX
= Year (1980-2099)
CH
= Month
(1-12)
CL
= Day
(1-31)
DH
=
Hours
(0-23)
SP
BP
DL
=
Minutes
(0-59)
SI:
Dl:
-
CY
not set
-
none
CY
set
-
Error
code
in
AX
IP:
FLC
\
CS
DS
SS
ES
This function
is
used
to
set the next
alarm Date/Time
for
the
internal
alarm system.
When
a
restart
alarm
occurs,
if
the
machine
is
powered
off,
it
will
be
turned
on and
the
application
program
set via function
XXh
will
be
run.
If
the
machine
is
powered on
when
the
restart
alarm
occurs,
it
will
be
ignored.
When
an
annunciator alarm
occurs, the
system
alarm event
flag
will
be
set.
This
will
cause
the
alarm annunciator
to flash
on
the
bottom
line
of
the
system
display.
See
function
EOh
for
a
description of
the
system
event
flags.
65

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