AT&T MERLIN LEGEND Release 3.1 System Programming Manual page 127

Upgrading the System
Before You Begin
Before you begin the upgrade to Release 4.0, you will need the items listed
below.
SPM Version 4.15 or later to back up and convert system programming
information and to restore system programming information after the
Release 4.0 processor module has been installed.
One or both of the following:
–
–
DOS-formatted diskette
NOTE:
If SPM is already installed, the
start SPM identifies the version on both the last line of the console simulation
window and in the upper left corner of the screen. If you are working with Version
4.15, appears in the upper left-hand corner of the screen and
appears on the last line of the console simulation window.
Inter-Release Compatibility
It is important to understand compatibility between files created on each of the
different versions of SPM, not only for upgrading but also for programming.
Table 2-6 summarizes programming compatibility. (It is assumed that the
majority of the programming is done in surrogate mode and backed up on disk).
Release 4.0 processor module (when converting from Release 2.1
or earlier.)
A forced installation PCMCIA memory card with Release 4.0
system software (when converting from any release).
screen that appears when you
Programming with SPM
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