> So the timing facility in the MPLAB simulator will work > correctly with an SX > executing 1 instruction per cycle instead of the PIC 1 > instruction per 4 clock > cycles? Also the difference in hardware stacks? I guess you have a different idea about 100% SX or what you want MPLAB to do. I think I never used the simulator, so for me that is outside 100% :) And you can just run (corrcetly simulated) 12-bit core code unaltered on an SX, including divide-by-4 speed and 2-level stack. Or use the assembler etc. to develop divide-by-1 9-level stack SX code. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu