Re: Video Card..

ronviers@[EMAIL PROTECTED]
 wrote:
> On Aug 29, 12:06 pm, JD <J...@[EMAIL PROTECTED]
> wrote:
> 
>> http://members.cox.net/slatteryt/RAM.html
>>
> 
> 
> I am not sure this is correct. At least in the days of x86
> architecture the Intel did not use memory mapped io. In other words,
> they used a separate assembly language command to write to a memory
> device. In other other words, separate pins.


http://sup****t.microsoft.com/kb/929605

For example, if you have a video card that has 256 MB of onboard memory, 
that memory must be mapped within the first 4 GB of address space. If 4 
GB of system memory is already installed, part of that address space 
must be reserved by the graphics memory mapping. Graphics memory mapping 
overwrites a part of the system memory. These conditions reduce the 
total amount of system memory that is available to the operating system.


-- 
  JD..