You only need an insert.o (which is kind of boot program for Atari Lynx) and lynxer.exe
Then just put both in same directory than the file you want to convert into .lyx (let's say chip8.o) and type
lynxer chip8.o
You can flash a .lyx on flashcard or burn it to an eprom, there is nothing more to do.
You will find both in old BLL kit or new developper kit from Karri.
Also, building his own insert.o is quite easy (but you need sprpck to convert image and an assembler to compile it), I guess there is an example somewhere (maybe on sage site ? or in the BLL kit sources). I also made an explanation in french on Yaronet...
If you want a .lnx for Handy, you will also need make_lnx.exe (given with Handy or Handydev I guess) and type :
make_lnx chip8.lyx -b0 256K to build a 256k rom useable with Handy
What is the best emulator to use for my PC using Windows program. I love My Lynx and have heard some good and bad things about the Handy. You sound knowledgeable, so please guide me in the right direction... what can i expect