Does Win use memory between 640K to 1024K...

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1 total messages Started by Shide Zhang Fri, 30 Oct 1992 04:03

Author: Shide Zhang
Date: Fri, 30 Oct 1992 04:03

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Sorry for posting such a question in ***.programmer group, but I do
believe you professional programmers know this better than others.

1. I own a 386SX-25 with 2MB RAM on the mainboard. Are they mapped as 0K to
   2048K (&H00000-&H1FFFFF)?

2. If they are, the memory between 640K to 1024K (&H0A000-&H10000) seems
overlapped with those 'reserved area' which has been asigned to be used as
video memory (for VGA it's &H0A000-&H0BFFFF) and ROM/buffer on peripheral
boards, i.e, the RAM on the mainboard and peripheral boards share the same
address between 640-1024K. Am I right?

3. If I am right, the question is whether or not Windows/DOS can access
the memory on the mainboard at the address which has been occupied by, say,
VGA card and video memory, etc.?

4. If Windows/DOS CAN access, the problem is that, the physical memory at
the  address to be visited,  say, H&A000, is video memory or the memory on
the mainboard? How could Windows/Dos tell?

5. If Window/Dos can NOT access, then why we spend our money on the
useless 640K-1024K?

BTW, when we use LOADHIGH command to put some of drivers to the upper
memory, where are they located?

Please e-mail me if you can help

Thanx in advance

szhang@bcm.tmc.edu

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