source: cmedia/trunk/Cmpci/DosSpy/cmispy.c

#include        <stdio.h>
#include        <stdlib.h>
#include        <conio.h>
#include        <dos.h>


//----------------------------------------------------------------------//
//                                                                      //
//----------------------------------------------------------------------//

void HexDump(void *pData, int nLength)
{
  unsigned char acBuffer[81];
  unsigned char *p = acBuffer, *q = (unsigned char *)pData;
  int           nIdx, n, nAscPos = 54;

  for( nIdx = 0; nIdx < nLength; nIdx++ )
  {
    p += sprintf((char *)p, "%02x ", q[nIdx]);
    n = nAscPos + (nIdx % 16);
    acBuffer[n] = ( q[nIdx] < 0x20 ) ?  '.' : q[nIdx];
    acBuffer[n+1] = '\0';

    switch( (nIdx + 1) % 16 )
    {
      case  0:  while( p < acBuffer + nAscPos ) *p++ = ' ';
                cprintf("%s\r\n", acBuffer);  p = acBuffer;
                break;
      case  4:
      case  8:
      case 12:  *p++ = ' ';
                break;
    }
  }

  if( p != acBuffer )
  {
    while( p < acBuffer + nAscPos ) *p++ = ' ';
    cprintf("%s\r\n", acBuffer);
  }

//  cprintf("\n");
}



int main(int argc, char *argv[])
{
  unsigned char achTemp[256];
  unsigned      uIOBase = 0xe800;
  int           i;

  if( argc > 1 )
  {
    uIOBase = (unsigned)strtoul(argv[1], NULL, 16);
    clrscr();
    cprintf("Portbase: %#x", uIOBase);

    while( !kbhit() )
    {
      gotoxy(1, 5);
      for( i = 0; i < 256; i++ )        achTemp[i] = inportb(uIOBase+i);
      HexDump(achTemp, sizeof(achTemp));

      geninterrupt(0x28);       
    }

    getch();
  }

  return 0;
}