• Compaq Deskpro M Family 386/25M (P/N 002028)
• Compaq Deskpro M Family 386/25M (P/N 002292)

This is for the 386DX versions.

386DX/25 Processor Board P/N 002028/002292 Spare 129157-001 (for both)

386DX/33 Processor Board P/N 002031 Spare 129419-001

All Deskpro M Family:

There are 3 EISA bus boards, 002005/002307/002541.

Models equipped with the Audio I/O board 002428 have Audio ports. Models with the Regular I/O board 002002/002304/002307 do not.

SW500 is located on the I/O board under the PSU, to the right side of the case.

Original source, further details and switch settings: http://66.113.161.23/~mR_Slug/deviceInfo/compaq/compaq_qrg/volume1/dpm.html