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Q42925: Activating Hercules Card on a Dual-Monitor System

Article: Q42925
Product(s): See article
Version(s): 5.10
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist5.10 S_QUICKC | mspl13_c
Last Modified: 17-MAY-1989

Part 3 of the Microsoft C Optimizing Compiler Version 5.10 README.DOC
states the following:

  If you have both a Hercules monochrome card and a color video
  card, you should invoke MSHERC.COM with the /H (/HALF) option.
  The /H option causes the driver to use one instead of two
  graphics pages. This prevents the two video cards from
  attempting to use the same memory. You do not have to use the
  /H option if you have only a Hercules card.

The /H option fails to work correctly on a system with two video
cards, where one of the cards is a compatible Hercules card.

This is not a problem with MSHERC.COM. The source of the problem lies
in the graphics library provided with Microsoft C Optimizing Compiler
Version 5.10 and QuickC Version 1.01.

This problem has been corrected in QuickC Version 2.00. The QuickC
Version 2.00 include files, libraries, and linker are fully compatible
with C 5.10. Upgrades are available for the C Optimizing Compiler and
prior versions of QuickC. Information on upgrades is available from
Customer Service.

You also must use the DOS MODE command to activate the monochrome card
prior to sending output to the Hercules display adapter.

Microsoft is researching this problem and will post new information as
it becomes available.

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