I'm jumping into the wayback machine here so you'll need to get better info but ... On the XTs the BIOS brought up the hardware (POST tests, etc) then did a call to a specific location on the drive. Your program would need to be able grab that call and then handle all of the I/O requirements (Keyboard, video, HD, ...) Is it possible? Yes Is it worthwhile? Maybe Might want to just use MSDOS 6.22 without windows and then run the program from autoexec.bat. John If memory serves, I believe the MSDOS was originally written in C. -----Original Message----- From: swann1 [mailto:[log in to unmask]] Sent: Sunday, September 10, 2000 3:16 PM Subject: Re: [PCBUILD] Running a PC Without Dos or Windows Hello all Does any know whether it would be possible to run a PC from a C program (i.e. with no operating system). Would I need to convert the program into object code so the computer can understand it. How would get the computer to recognise the program at start up, It would be a very simple program. Any Help would be appreciated Many thanks Steven Swann The NOSPIN Group provides a monthly newsletter with great tips, information and ideas: NOSPIN-L, The NOSPIN Magazine Visit our web site to signup: http://nospin.com PCBUILD maintains hundreds of useful files for download visit our download web page at: http://nospin.com/pc/files.html