BUG: SAVEIMAGE May Cause Error DX1020 in SVGA Display Modes

• Microsoft FORTRAN PowerStation 32 for MS-DOS, versions 1.0 and 1.0a

SYMPTOMS

Using the SAVEIMAGE function in a high resolution Super VGA mode may produce the following error during program execution:

   DOSXMSF : fatal error DX1020: unhandled exception: General
             protection fault;

CAUSE

The error occurs when attempting to save regions close to the entire size of the display. The exact region that causes the GP fault varies according to the display adapter used.

RESOLUTION

Select smaller regions of the display to save as Windows .BMP files. For example, an entire screen could be stored in two .BMP files.

STATUS

Microsoft has confirmed this to be a problem in FORTRAN PowerStation for MS- DOS.

This problem does not occur on FORTRAN PowerStation 32.

MORE INFORMATION

Compile and run the sample code on a PC with an ATI Graphics Ultra to generate the following error on the second call to SAVEIMAGE:

Sample Code

Compile options needed: none

      include 'fgraph.fi'
      include 'fgraph.fd'

      i= setvideomode($XRES16COLOR)
      i= saveimage('savimag1.bmp',0,0,1023,510)
      i= saveimage('savimag2.bmp',0,0,1023,511)
      end