IBM RT PC 10 Hardware Maintenance And Service page 107

Memory Expansion Option PIC 2100
This PIC analyzes the 21x and 37x SRA numbers. The 21x SRA isolates
the failure to an option. The 37x SRA isolates the failure to a single
memory module. The starting addresses can be used to determine the
address range where the failure occurred.
Step 1
Look at your SRN.
4. Write the Service Request Number here:
~-37K
-
21B . _
IS ANY OF THE SRAs "210"?
YES The diagnostic programs were unable to determine the location of
the failing option. Exchange the options one at a time and run the
AT 512 KB Memory Expansion Option Checkout.
NO Continue on the next page.
3-62 Service Manual