For the (Windows mode):
Alternative Solutions: How to Play Diablo 2 on Retro Handhelds diablo 2 portmaster
To play Diablo 1 via PortMaster, you must own the original game. Copy your DIABDAT.MPQ file from your GOG installation into the /roms/ports/devilution folder on your SD card. DevilutionX - Port Details For the (Windows mode): Alternative Solutions: How to
It sounds like you're asking about and Portmaster . diablo 2 portmaster
(Manual)