Sigmarion III and Doom?

Guys i need some serious help!

My effort so far:

Chocolate Doom:
- hacked the file to work on Sigmarion III
- hacked my japanese SD card folder to "SD Card"
- installed all the "Legacy" files
- installation process works fine, exe does not start

HPC Doom:
- see above crashes after loading everything just fine

Doom Legacy
- installed Gapi
- forced "Sigmarion III" via on/off during the choose device process

Game runs fine without any Gapi settings in a tiny window or runs 480x640 if i hide the taskbar but way to slow...
Any other relevant Gapi setting crashes the game so does changing the resolution in the ingame setup :laugh:

This is driving me crazy!
H E L P ! :D