Microcode Studio Plus apparently wants to see MPASM.exe, not MPASMWIN.exe.

My (downloaded through the link on MELABS site) MPASM folder only had MPASMWIN.exe in it. So MCS+ searched around my HD and found an old MPLAB installation with MPASM.exe in the folder! I guess that version or the accompanying inc files didn't support the 18F4620 - so it generated all kinds of bogus errors.

I renamed the (desired) MPASMWIN.exe to mpasm.exe and MCS+ stopped substituting the older version of MPASM, and all is good with the world now.

Thanks for pointing me in the right direction with the PBP.exe vs PBPW.exe. That doesn't seem to have been the issue, but it got me looking at the compiler/assembler settings. Now to gobble up all that newly realized program space! Sure beats the old 16c54!

Best,

Mike