From: "H.Shiozaki" <hshiozaki AT nifty DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: IO_Port Access in DJGPP + Windows 2000
Date: Sat, 24 Aug 2002 03:49:41 +0900
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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

First of all, sorry my bad English,  and I am a newbie.
---
I worry about: generally speaking as, 
In Windows NT,2000,
To access IO_Port from a normal win32 program,
  there need IO_access_DLL or IO_Driver.
---
In Linux, a program can direct access IO_Port with 
  using ioperm() function.
---
I made a program included IO_Port_Access, by DJGPP_V204.
A program can run in Win_98_DOS-BOX and Win_98_command_prompt_only.
I re-compiled that program in DJGPP_V204 + Win2K,
But, new program can not do nothing to the IO_PORT in Win2K_DOS-BOX.
---
Win2k have 2 type command_line,
one is CMD.exe and another is Command.com in system32.
===
Q1.
Is there any means to IO_Port access in DJGPP + Windows 2000 environment ?
or how to access IO_port in Win2k_command_line?
Q2.
If IO_Port_acces can do, I want HOWTO information or sample program.
Q3. Which to be use in Win2K, CMD.exe and Command.com?
    (What are difference between CMD.EXE and Command.com?
    or are there information about it ?)
===
A sample program below can run in Win98(DOS-BOX)
But can not run in W2K(DOS-BOX)
Please change this program to run under Win2K.
---
#include <stdio.h>
#include <pc.h>
void main(void);
void main(void)
{
    int i;
    unsigned char c=0;
    while(1){
        if(kbhit()) break;
        for(i=0; i<500; i++) inportb(0x378); /*delay*/
        outportb(0x378, c++);
    }
}
---
Regard
H.Shiozaki