Interrupt Level Select - IBM RT User's Setup Manual

In terru pt Level S elect
The position of jum per module J8 determ ines the in te rru p t level;
level 12 is the default setting. To change J8, do the following:
1. Carefully in sert a small, flat-bladed screwdriver under the J8
jum per module, a lte rn ately lifting the ends to e x tract the
module evenly.
W arning:
Do n o t b e n d th e pins!
AJZIF156
2. T urn the module 180° and reinstall.
6-28 Options Installation