KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q60866: OS/2 1.20 Requirements for Dual-Monitor Debugging

Article: Q60866
Product(s): See article
Version(s): 2.x 3.00
Operating System(s): OS/2
Keyword(s): ENDUSER | PM | mspl13_basic
Last Modified: 17-JUL-1990

To do dual-monitor debugging under OS/2 Version 1.20 with CodeView,
make sure that you have the correct display DLLs specified in your
CONFIG.SYS file.

For example, the following three lines in your OS/2 CONFIG.SYS file
specify the device drivers needed to use a VGA and a monochrome
adapter:

   set video_devices=bvh_vga,bvh_mpa
   set bvh_vga=device(bvhvga)
   set bvh_mpa=device(bvhmpa)

If you have a CGA or an EGA monitor and adapter for your primary
(color) display, replace device(bvhvga) with device(bvhcga) or
device(bvhega), depending on your adapter type.

Next, make sure that both of the BVH*.DLL files (in the above case,
BVHVGA.DLL and BVHMPA.DLL) specified in the device(name) section are
in your LIBPATH. OS/2 setup places these files in your C:\OS2\DLL
directory by default.

Note: You can substitute any name for bvh_vga or bvh_mpa, as long as
those two placeholders match up with the name tab in the set
<name>=device... lines.

Remember, the two monitors must be unique for OS/2 to determine which
monitor is which. For instance, debugging with two VGA monitors will
not work because OS/2 and, therefore, CodeView will be unable to
determine which adapter/monitor is the primary adapter/monitor and
which is the secondary adapter/monitor.

This point is critical to remember when considering dual-monitor
debugging on a microchannel machine (for example, an IBM PS/2 Model 50
and above). Since there are currently no microchannel monochrome
adapter cards on the market, the only alternative is to use a VGA and
an 8514 as the two monitors. The following are the matching three
lines for your OS/2 CONFIG.SYS file for that scenario:

   set video_devices=bvh_vga,bvh_8514
   set bvh_8514=device(bvh8514)
   set bvh_vga=device(bvhvga)

Using this setup, the 8514 monitor displays the graphics output (or
the Presentation Manager screen) and the VGA is the debug monitor and
displays all text output.

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.