From: Martin Alt <martin DOT alt AT siemens DOT at>
Newsgroups: comp.os.msdos.programmer,comp.os.msdos.djgpp
Subject: Re: adress enabling (Win98)
Date: Mon, 28 Aug 2000 15:42:04 +0200
Organization: Siemens AG
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi,

> I don't understand what you mean.  Are you using a DOS application to write to
> a specific address?  It should work just fine in a plain DOS session as well as
> a Windows '9x session.  Perhaps you could post the relevant portion of code,
> along with a better description of what you are doing and what the exact result
> is?

I didn't want to boring with long code, but it looks like:

-----------
#define ISAADDR 0xd800

static unsigned portRead = ISAADDR,portWData  = ISAADDR + 1,portWCtr  = ISAADDR +
2,portOE = ISAADDR + 3;

void bos021_wr(unsigned short reg,unsigned short data)
{
  outpw(portWData,data);                                /* write data to Data latch
*/
  outpw(portWCtr,(unsigned short)(0x01<<(reg-1)));      /* write reg to Controll
latch */
  outpw(portOE,(unsigned short)0x03);                   /* enable output */
}
------------
I didn't get an error, but there is also no outbut (chipselect,...).
With MS-DOS it works well, so it has something to do that I am not allowed to write
on this adress.
I reserved to range in BIOS and/or Win98 but it seems that only a device driver has
access!?!

Regards
Martin