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Q67005: OS/2 Graphics Functions May Fail on 8514/A Display Adapter

Article: Q67005
Product(s): See article
Version(s): 6.00 6.00a
Operating System(s): OS/2
Keyword(s): ENDUSER | buglist6.00 fixlist6.00a 8514A | mspl13_c
Last Modified: 18-NOV-1990

The graphics functions in GRTEXTP.OBJ provided for OS/2 in Microsoft C
version 6.00 do not properly recognize the 8514/A display adapter when
setting video modes. This results in the inability to set the number
of text rows to certain values.

If the 8514/A display is set to 50-line mode, an attempt to use
_settextrows() to set the number of rows to 43 will fail. If the
screen is set to 25- or 43-line mode, the call to _settextrows() will
succeed, but the screen may only be in 25-line mode.

To view this problem, use the SORTDEMO program supplied as an example
with the C 6.00 package. This program tries to put the screen in
43-line mode.

Compile SORTDEMO.C for OS/2 as described in the comments at the top of
the file. Type MODE CO80,50 at the OS/2 command-prompt to put the
screen in 50-line mode, then run the program. The program will cause a
general protection violation (GP fault). If you type MODE CO80,25, the
program will run but it will only detect CGA equivalent video, and
therefore, will only run in 25-line mode.

Microsoft has confirmed this to be a problem in C version 6.00. This
problem has been corrected in C version 6.00a.

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