IBM RT PC 10 Hardware Maintenance And Service page 106

Step 39
Determine the type of display adapter the display is attached to. Find the
adapter type in the table below.
Type Display Adapter
SRN
Enhanced Graphics Adapter 12-410
Advanced Monochrome Graphics Display Adapter
12-430
IBM Monochrome Display and Printer Adapter 12-490
DID YOU FIND THE ADAPTER IN THE TABLE?
YES Record the SRN, then go to "Step 2" on page 3-6.
NO The display adapter is not supported in this documentation.
Problem Isolation Charts 3-61