Specifications

PERFORMING DOWNLOADS
Effect of Downloads on Existing Files and Data
98 OMNI 37XX REFERENCE MANUAL
• Before you perform a download, use system mode menu selections to clear
the entire RAM and/or flash or the RAM or flash of a specific file group, as
necessary to ensure proper use of available memory in the target group.
Support for File
Compression
For information regarding file compression, refer to refer to the Verix Operating
System Programmer’s Manual (VPN 19733).
Effect of
Downloads on
Existing Files
and Data
When you download application files and data to an Omni 37xx terminal, an
important consideration is the effect of download procedure on existing
application files, files used in the file authentication process, and terminal
configuration settings stored in CONFIG.SYS files in the receiving terminal. Here
are some important points to remember:
• If a file already exists in the target file group, the existing file is replaced with
the new file of the same name. (Files in separate file groups can have identical
names.)
• Always download executable files (and any other files to logically protect
under VeriShield file authentication) together with the certificates and
signature files required to authenticate them.
• In full or partial application downloads, all CONFIG.SYS records on the
receiving terminal, both protected and non-protected (beginning with * or #),
are retained. New CONFIG.SYS variables included in the download package,
including the *GO variable, selectively replace existing variables with the
same key name in the CONFIG.SYS file of the target group.
• All current passwords are retained on the receiving terminal during an
application or operating system download (direct, by telephone, and back-to-
back). This includes the system mode password and file group passwords. If
required, you can replace existing file group passwords with new values as
part of the data transfer operation.
• For back-to-back application downloads, clear the RAM and flash of the
receiving terminal before initiating the download. All application files stored on
the receiving terminal, including CONFIG.SYS settings, are replaced by those
of the sending terminal. System mode and file group passwords are retained
on the receiving terminal.
• For full operating system downloads, Group 1 RAM is cleared as part of the
operation and any application files stored in GID1 are erased. In this case,
previously downloaded and authenticated applications must be downloaded
again in a subsequent operation, together with the certificates and signature
files required to authenticate them.
NOTE
Always modify the system mode password in a separate, securely-controlled
operation.