When I tried it, the FOSC settings worked as expected, however by studying the INI file I can see that FOSC can be corrupted by attempting to set FCMEN and IESO and I don't recommend inclusion of any their definitions if you are using PM assembler. I was NOT able to change FCMEN or IESO in my definition tests, they always remained ENABLED regardless...

@ DEVICE PIC16F88,FCMEN_OFF

or

@ DEVICE PIC16F88,FCMEN_ON

always produced FCMEN=Enabled, just the same as...

@ DEVICE PIC16F88,IESO_OFF

or

@ DEVICE PIC16F88,IESO_ON

always produced IESO=Enabled.


I've already contacted MeLabs about this (waiting for a reply as they wouldn't be back from the weekend yet).