Hi Alan, Those .dev files are used by MPLAB (and AFAIK by some third party software)= , not by the assembler. (as gpasm BTW) It would be great if the assembler/linker were configurable...=A0=20 Best regards, Philippe=20 -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of alan.b.pearce@stfc.ac.uk Sent: Tuesday, September 6, 2016 10:55 AM To: piclist@mit.edu Subject: RE: [PIC] 18F14K22 issues The MPLAB 8 series has a processor definition file that maps all the memory and I/O areas for each chip along with things like programming voltage and other sneaky bits that the IDE needs to know to program up a chip. It is a text file and readily found. Open a DOS window and search for 18f14k22.* using the /s switch on dir. Then look in the files it finds and you will se= e what I mean. And I am surprised you mention using MPLAB 8.56 - is there a reason you are not using 8.92, the last version? --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .