VGA buffer address

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2 total messages Started by Kayvon Z. Sadeghi Fri, 21 Aug 1992 18:33

#409

Author: Kayvon Z. Sadeghi
Date: Fri, 21 Aug 1992 18:33

19 lines
983 bytes

hi out there,

I am trying to write a program that reads the screen buffer and changes
the contants. It works with monochrome display machines as I use the
adress 0xB000; but when it comes to VGA or any other monitor, it gives me
some trouble. I am using the address 0xB800, I think thats the right one
as I have checked it in many ways.
BTW, I am using C, if that matters.

Can anyone give me a hint?


thanks alot
k1
---
------------------------------------------------------------
KAYVON Z. SADEGHI                  K.SADEGHI@IEEE.ORG
VOICE: 202/244-0789

Re: VGA buffer address

#314

Author: Scott C. Sadow
Date: Tue, 25 Aug 1992 14:03

17 lines
969 bytes

In article <92234.143304KSADEGH@auvm.american.edu>, KSADEGH@auvm.american.edu (Kayvon Z. Sadeghi) writes:
>(stuff deleted)
>I am trying to write a program that reads the screen buffer and changes
>the contants. It works with monochrome display machines as I use the
>adress 0xB000; but when it comes to VGA or any other monitor, it gives me
>some trouble.
>(stuff deleted)

The CGA, EGA, and VGA use 0xB800. Monochrome uses 0xB000. (This is how you
can have 2 monitors on 1 system - one is CGA/EGA/VGA, there is monochome
and there are no address conflicts)

   Scott C. Sadow
   scott@mycro.UUCP
   ...gatech!nanovx!mycro!scott

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