From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter J Eccles To: º£¶« Cc: "cygwin@sourceware.cygnus.com" Subject: Re: Problem about parallel port! Date: Thu, 28 Sep 2000 19:39:00 -0000 Message-id: References: <20000928010859.111D11C2E8E4A@smtp.263.net> X-SW-Source: 2000-09/msg00974.html > How can I access the parallel port in cygwin under win2000 or win98? Under win98 (aka DOS), anyone can get unrestricted access the the IO ports of the board using code such as: static inline int win9x_inportb( int port ) { unsigned char value; __asm__ volatile ("inb %1,%0" : "=a" (value) : "d" ((unsigned short)port)); return value; } static inline void win9x_outportb( unsigned short int port, unsigned char val ) { __asm__ volatile ( "outb %0,%1\n" : : "a" (val), "d" (port) ); } Under Win2k (aka WinNT), it is more involved, you need to use a device driver to do the work, and you just use function calls to this device driver to do the actual port IO. I have used the MMP library (which gives access to the entire IO space and memory, and therefore is not really secure). MMP lives at: http://www.einev.ch/references/mondada/mmp/ There is many others though which are perhaps a bit safer, try: http://www.lvr.com/ for links to a few other libraries (under the parallel port section) =============================================================================== Peter Eccles Computer Systems Engineering (4th year) RMIT Melbourne Australia email: petere@connexus.net.au =============================================================================== -- Want to unsubscribe from this list? Send a message to cygwin-unsubscribe@sourceware.cygnus.com