The file IBMBIO.COM or IO.SYS is the interface module to the ROM BIOS. This file provides a low-level interface to the ROM BIOS device routines and may contain extensions or changes to the system board ROMs. Some compatibles do not have a ROM BIOS to extend, and load the entire BIOS from disk. (Sanyo 55x, Viasyn machines). Some versions of MSDOS, such as those supplied to Tandy, are named IBMBIO.COM but are not IBM files.
|file: /Techref/bios/io_sys.htm, 0KB, , updated: 2003/10/24 03:50, local time: 2019/12/9 08:17,
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<A HREF="http://www.sxlist.com/techref/bios/io_sys.htm"> BIOS Patch File IO.SYS or IBMBIO.COM</A>
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