Date: Thu, 15 Dec 94 13:38:43 -0500
From: dj AT stealth DOT ctron DOT com (DJ Delorie)
To: davis AT amy DOT tch DOT harvard DOT edu
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Re: seeking advice 


Use <sys/farptr.h>.  The framebuffer is available in all modes.

read_from_fg(x,y)
{
  _farsetsel(_go32_info_block.selector_for_linear_memory);
  _farnspeekb(0xd4400 + y);
  return _farnspeekb(0xd4000 + x);
}

Using _farsetsel outside the loop and _farnspeekb inside the loop is
very efficient, but you can't expect the _farsetsel to last across any
system calls or anything.

For one-off calls, you can use _farpeekb(sel, ofs) directly.