This patch adds new dio interface driver called portio which allows raw access to hardware I/O ports. It can be used on x86/x86_64 machines to access hardware devices connected to ISA bus (or to TTL parallel port accessible through ISA bus) using inb_p and outb_p calls. It is designed for Linux and QNX and any system that provide sys/io.h header. It won't work on Windows 2000 and later. Since it calls iopl() it needs System Adninistrator rights at Player server startup.
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