I use 1mb EasyFlash cartridge format. All code and data is built using my custom build system, and I use the cartconv VICE util for making the cartridge .crt format.
There are docs available about the EasyFlash format if you search for it.
thanks, i figured it out the hard way already but thanks for answering. I basically used a hex editor to copy paste the chunks (CHIP s) and how to use eapi, other than that 64studio isnt in a total finished state but does the trick ... looking forward to bwc2 !!!