Memory Type Range Registers

architecture, video (MTRR) Registers in the Pentium Pro

and Pentium II processors that can be used to specify a

strategy for communication with the external memory and

caches for a number of physical address ranges.

Strategies include write-through, write-back, or

uncached(?). Such control is useful where the memory is

located on a device and is accessed via some kind of device

bus, e.g. a PCI or AGP graphics card, where caching

would be of no benefit.

(1999-07-02)