Intel MCS48 User Manual page 459

a.
N
word
x
8-bit
device
Column Data
1
Record mark:
A
colon
is
used to
signal
the
start
of
a
record.
2-3
Record
length:
This
is
the
count
of the actual
data bytes
in
the record.
Column
2 con-
tains
the high order
digit
of the count,
Column
3 contains the low order
digit.
A
record length of zero indicates
end
of
file.
All
frames containing data
will
have
a
maximum
record length of
10hex
bytes
(16 decimal).
4—7
Load
address:
The
four characters starting
addresses at
which
the following data
will
be loaded.
The
high order digit
of the load
address
is
in
Column
4 and the
low
order
digit
is
in
Column
7.
The
first
data byte
is
stored
in
the location indicated
by the load
address.
Successive data bytes are
stored
in
successive
memory
locations.
ROMs
con-
taining
more
than 16 bytes of data
will
use
two
or
more records or cards to transmit
the
data.
Although
the load address for
the
beginning record
need not be 0000, each
subsequent load address
should be
"10h"
(16 decimals) greater than the
last.
8-9
Record
type:
A
2-digit
code
in
this field speci-
fies
the
type
of this record.
The
high order
digit
of
this
code
is
located
in
Column
8.
Currently,
all
data records are
type
0.
End-
of-file
records will
be type
1;
they
are
dis-
tinguished
by
a
zero
RECORD LENGTH
field (see
above).
Other possible values for
this field are
reserved
for
future expansion.
10-73
Data
75—75
Checksum:
Same
as
paper tape format.
76-78
Blank
79—80
Punch same
2-digit
decimal
number
as
in
Title
Card.
b.
N
word
x 4-bit
device
This format
is
identical
to the previously
documented
8-bit
hexadecimal format with the following exceptions:
Column
Data
10—73
Each
memory
location
is
represented by
two
columns
containing the characters
0—9,
A—
F. Since this
is
4-bit data,
the user
must
indicate
which
character of
each
pair
is
to
be used
as valid data.
A
single
deck must
be
submitted without mixing
first
and second
characters of the
pair.
A2-9