The ECS RC415T-AM is a Socket 775 motherboard originally designed for Intel-based desktop systems. Often found in OEM builds like those from Acer or Packard Bell, this micro-ATX board is built around the ATI Radeon Xpress 1100 (RC410/RC415) chipset.
Since this is an OEM board, you should follow standard Micro-ATX installation procedures as outlined in the Acer Generic Service Guide or generic ECS manuals. rc415tam motherboard manual
Alternatively, check VOGONS or BetaWiki forums – vintage PC communities frequently archive OEM manuals. The ECS RC415T-AM is a Socket 775 motherboard
RC415T-AM manual PDF (or RC415TAM)MB.SP709.001). Searching that number yields more accurate results.