Hello, look into the "c.bat" file. There you can see that I use the SDCC. After installing SDCC on your system remove or rename the standard "crt0.o" from the "SDCC\lib\Z80" Folder. Bigrom use his own crt0.asm! TobiFlex > > I need to know the development tools used to program the TG80 so I can modify the bigrom for minimigtg68 please ? > > I am looking to load the KS into the flash to enable selecting kiskstart using switches. > > Enya. >