> I've always wanted to build a digital thermometer to interface with
 > my computer. When I was using DOS, I thought it would be a fairly
 > straightforward task of direct hardware manipulation to gather the
 > information from the device.  With OS/2, I'm not so sure.  Because
 > of the greater protection OS/2 affords the entire system, will I be
 > required to write a device driver to access the CPU ring that allows
 > direct port manipulation?  Additionally, can someone provide some
 > information, perhaps direct experience, on the matter? Any help would
 > be appreciated.  Thanks.

If you want to access hardware ports directly you need to set
"IOPL=YES" in your config.sys and then give the code segment that access
the hardware "IO Priviledge Level" in a .DEF file. I don't recall the
syntax for this, but it should be in the online docs that come with any
compiler. (This is for hardware that is I/O mapped. If your hardware is
memory mapped, you will probably need to do something that maps a
virtual address to a physical address and then use that address. I'm
less familiar with that though...)

hank

 þ KWQ/2 1.2g þ This tagline stolen by KWQ Mail/2.


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