changes the data specified
in
SYS2/SYS.PASSWORD to the data
in
TEST/FIX. Since the data beginning at record
0B,
byte 49 and
55
is
directly changed
on
disk, this
is
an
example of a direct disk modify
patch. The Find patch commands let
you
make sure you are patching
the correct place
in
memory.
Using PATCH on a TRSDOS System File
When Radio Shack releases a modification
to
TRSDOS, you receive
a printout of the exact patch commands that
you
must use to make
the change.
Suppose Radio Shack sends
you
the patch information for a file
named
L1B1
that contains the following patch code:
.USE
L1B1
TO
PATCH SYS6/SYS.
L54
X'5208' =
32
20
DE
AF
00
C3
66
00
Use the BUILD library command to create the file
L1B1,
and type
in
the lines exactly as they appear
on
the printout. After
you
end the file,
type
in
the command line:
PATCH
SYSG/SYS:
1
USING
UB1
(ENTER)
This changes the data specified
in
SYS6/SYS
on
Drive 1 to the data
in
LIB1/FIX. Since
you
did not specify
an
extension to LIB
1,
it
defaulted to /FIX. This patch
is
in
the memory load location mode.
Library patches
can
also
be
done with the direct disk modify mode.
To
be
sure that
you
do
not patch the disk
in
Drive
0,
specify the drive
number
in
the filespec (such
as
SYS6/SYS:2) or write protect the disk
in
Drive
0.
PATCH lets
you
implement any changes
to
TRSDOS that may
be
supplied
by
Radio Shack. This way, you
do
not have
to
wait for a new
release of TRSDOS.
To make a Radio Shack change, follow these general steps:
1.
Make a backup copy
of
the diskette to
be
patched.
2.
Insert the TRSDOS diskette to
be
changed into one of the drives.
(Make sure the diskette
is
"write-enabled.")
3.
In
the TRSDOS mode, use the BUILD library command to create a
PATCH file containing the patch commands specified
in
the
information provided
by
Radio Shack.
4.
Issue the appropriate PATCH command.
5.
After the patch
is
complete, test the patched diskette
in
Drive 0 to
see that
it
is
operating
as
a TRSDOS system diskette.
You
have to
reset the computer before
you
can
test the diskette.
1-99
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