Command (CMD) File Generation
3-6
COMMAND FILE FORMAT
The
CMD
file produced by
GENCMD
consists
of
a 128-byte header record fol-
lowed immediately by the memory image. Under normal circumstances, the format
of
the header
record
is
of
no consequence
to
a programmer.
For
completeness,
however, the fields
of
this record are shown in Figure 3-1.
<----------------------
128
Bytes ---------------------->
GD#I\
GD#2\GD#3JGD#41
GD#5-GD#8
...
Code,
Data,
Extra,
Stack,
Auxiliary
Figure
3-1
CMD File Header Format
In
Figure 3-1, GD#1 through GD#8 represent Group Descriptors. Each
Group
Descriptor
corresponds
to
an
independently loaded
program
unit
and
has the
following fields:
8-bit
16-bit
16-bit
16-bit
16-bit
G-Form
G-Length A-Base G-Min
G-Max
where
G-Form
describes the group format,
or
equals zero
if
no more descriptors
follow.
If
G-Form
is
non-zero, then the 8-bit value
is
parsed as two fields, as follows.
G-Form:
4-bit 4-bit
x x x x G-Type
The
G-
Type field determines the
Group
Descriptor type. The valid
Group
Descrip-
tors have a G-Type in the range I through 9, as shown in Table 3-2.
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