IBM RT User's Setup Manual page 317

6-30 Options Installation
• If the late adapter version is being used, select one J5-J6
only
combination per adapter from the following table.
• If one early adapter version is used with one or more late
adapter versions, only three of the four J 5-J 6 combinations are
available, depending on the setting of J 3 on the early adapter
version:
- When the early adapter version Jumper Module J 3 is set for
Primary, select one J5-J6 combination per late adapter
version from the last three rows of the following table.
— When the early adapter version Jumper Module J 3 is set for
Alternate, select one J5-J6 combination per late adapter
version from the first, third, or fourth rows of the following
table.
• If two early adapter versions are used with one or more late
adapter versions, only the last two rows in the J5-J6
combination table are available for use with the late adapter
version.
A J ZIF 158