I had forgotten to add proper tag to my posting. Apologies for that.. Here is my original mail: Goodafternoon all, // Now is morning in here :) I've seen some different OS ports for PIC18. But not sure which one is more effecitve and less painfull to design. SalvoRTOS, PIC18OS, FreeRTOS, uC/OS-II for PIC18.. Whats your comments on that? Thanks, G=F6khan SEVER. //-------------------------------------------------------------------------= ------------------------------------------ Xiaofan Chen replied after some time: I guess none of them are really useful for hobbyist project. PIC18OS and FreeRTOS are free and open source so I think they might be worth studying. Regards, Xiaofan //-------------------------------------------------------------------------= ------------------------------------------ And i've replied and realized that i've forgotten to add the tag ;( Thank you very much for your guidelines. I hankered after Pumkin Salvo (http://www.pumpkininc.com/) which has huge support for Microchip's devices. PIC12|14000|16|17|18 *PICmicro*(r) MCUs and also for *PIC24* MCUs and *dsPIC*(r) DSCs. Besides its ported other mcus as well. Lots application notes and programming examples are very significant on the view point of novice programmer. Restricted-demo version can be downloaded from that page. The most ported RTOS should be Micrium's. Huge range of mcu list.. MicroC/OS-II, The Real-Time Kernelbook is very outstanding but i dont think its a good starting point for the starter rtos app developer. Although Salvo can be good candidate for me to get started on that topic, the full version's price way over my budget. If i can find some help i will stick to free alternatives. Again thanks, G=F6khan SEVER. //-------------------------------------------------------------------------= ------------------------------------------- -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist