Technical information

Sega Saturn Software Development Standards, SOA version 2.0 59
Appendix 3:
Multiple Disc Applications Software
Development Standards
The multiple disc applications in this document suggests that 2 discs or more
are required to fully play a game; furthermore, because of the story line, these
discs are interdependent. The multiplicity (of discs) does not apply if a game
can be played on discs independently. Simply stated, this document is written
for 2 discs. Applications designed for 3 discs or more can be explained in the
same way.
This document describes the following expressions:
• Multiple discs are referred to as <disc 1>, <disc 2>, and so on. They may
also be referred to as <disc A>, <disc B>, and so on. Make sure there is
right correlation with the application CD label.
• Messages shown in <> are examples. Use them to avoid misleading users.
• The expression "launched" is used with [disc X]. This means "when
playing a game, the first disc inserted is <disc X> and currently this disc
is in the tray."
1. Basic Design
1.1 Specification Conditions
The following are specification conditions imposed on the 2nd and
subsequent discs:
Necessary conditions
• Discs must be launched from the multiplayer screen.
(-> Discs must be passed through the CD check; i.e., the security
check.)
• Backup RAM must be used between discs to save data.
(-> This is the only way to pass data to the 2nd and subsequent
discs.)
Note: As an exception, data may be passed to the 2nd and subsequent
discs using a password. In this case, backup RAM may not be used.