I'll have to look again, the JWasm needs a linker too. Sadly, I think it was the ld.exe from MinGW that I had problems with in the past :( . Yea, I'm really ju

I'll have to look again, the JWasm needs a linker too. Sadly, I think it was the ld.exe from MinGW that I had problems with in the past :( . Yea, I'm really just doing this for the fun of it, not any actual needed reason. If the "flat" version you're talking about is the old 16-bit .COM format, then yes it will not work on modern 64-Bit windows. That was the first method I tried with an old version of MASM as it was really easy to assemble directly to a program back in my Assembly class days.