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The
following
is
a
list
of
the
system
special
character codes,
and what
they
mean:
1.
<QUIT>
-
6700h
-
Program
termination request.
The
program
should place
itself
into
an
orderly state
and
perform
an
OSTERM
function.
2.
<SUSPEND>
-
C100h
-
Program suspend
request.
The
program
should place
itself
into
an
orderly state
and
perform
an
OSTERM
function.
3.
<REDRAW>
-
C200h
-
The
application
program
should
redraw
its
screen.
Programs
should
redraw
their
screen on
return
from
an
OSTERM
function,
and
additionally
when
they
see
this
character.
Program Header
Applications
programs
contain
a header used by
the
HH
O/S
execute
program
function
to
verify
that
the
file is
executable
and
to
provide the
necessary
information
for
the
program
to
be
executed.
The
format
of this
header
is
as
follows:
Length
Name
2
APLCHK
2
AMICOD
1
LDRID
1
AM
I
VIS
1
AMITYP
3
AM
I
EXT
2
APLIP
2
APLSP
2
APLSIZ
2
DATPOS
2
DATLOC
2
DATLEN
Total:
22
The
following
fields
are
optional.
Their
presence
is
determined by
bit
40h
in
the
LDRID
byte
field.
If
this
bit is
set,
these
fields
must be
present
in
the
application
header.
2
APLSIZ
2
reserved
2
reserved
2
reserved
2
reserved
Total:
32
Each
field
is
now
described
in
detail
113
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