MERLIN LEGEND Communications System Release 6.1
System Programming Guide
555-661-111
Issue 1
August 1998
Programming with SPM
Page 2-27Using SPM
2
Backup 2
The Backup procedure is used by qualified service personnel to create a file of
system programming information either in the \spm\backup directory (on the hard
drive of the PC) or in the root directory of a floppy disk.
NOTE:NOTE:NOTE:
Back up your system programming information on a regular basis. A current
backup file allows you to quickly and easily restore your system, if the need
arises.
Determining the Release Number
of a Backup File 2
If you have a backup disk but do not know its release number, you may be able to
find this information in the backup header.
Beginning with later versions of Release 1.1, the backup file contains a backup
header 128 bytes long. Approximately 59 of these bytes are currently used. Bytes
55 through 59 of the header contain the MERLIN Legend Communication System
Release number, as shown in Table 2–4
. (Release 1.0 and early versions of
Release 1.1 do not contain this information in readable form.)
The release number is found in the first two bytes (four characters) of the
identification number. For example, 0600 = 6.0, 0402 = 4.2.
If the backup file is compressed (Release 1.1 and later), you can read the header
but you cannot read the data area following the header. Use
UZQF [
backup
filename
] to read the header on a DOS system or DBU [
backup filename
] to read
the header on a UNIX System.
Note that it is the communication system release number, not the version number
of SPM, that reflects whether the backup file is compressed or uncompressed.
Release 1.0 backups are uncompressed and Release 1.1 and later backups are
compressed. Uncompressed files take longer to restore.
Table 2–4. Backup Header: Release Number
Release No. Build No. System Size Mode
Size 2 bytes 12 bytes 1 byte 1 byte
Examples 06 00 32 01 01 (Key)
04 02 02 (Behind Switch)
03 (Hybrid/PBX)
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