IBM 2193 - Manual (Page 131)

Adding and replacing system board components 9-5
Identifying system board parts (machine type 2194
and 6345)
If you plan to add or replace hardware in your computer, you need to know the
layout of the system board. This figure shows an example of the system board of the
machine type 2194 or 6345 in your computer. The items on the next page
correspond to the numbered locations on the figure.