QB.EXE Visibility, IBM PS/2 Model 50,60,80, Monochrome Monitor

The problem below was reported by a customer using QuickBasic version 4.00b on the IBM PS/2 models 60 and 80 (which have VGA graphics) with a monochrome monitor. (This problem probably also applies to the IBM PS/2 model 50 with a monochrome monitor.) Another customer reported a similar problem in QB.EXE in QuickBasic version 4.50 and in QBX.EXE in Microsoft Basic Professional Development System (PDS) version 7.00. Microsoft is researching this problem and will post new information here as it becomes available.

When the QB.EXE version 4.00b editor is started with the /b switch (QB /b) on a IBM PS/2 model 60 or 80 with a monochrome monitor, it appears to start correctly. However, when a file is OPENed, QuickBasic ignores the /b option and switches to color mode, causing the editor to be hindered by visibility problems. Also, when the DOS SHELL command is chosen from the File menu in QB.EXE, the text in MS-DOS is highlighted and blinking.

To work around this editor visibility problem, execute the MODE BW80 or MODE 80 command in DOS before running QB /b or QBX /b.

This problem does not occur with QB.EXE version 4.00.

The customer reported the above problem on the following equipment: On the IBM PS/2 models 60 and 80 with the standard IBM PS/2 monochrome monitor, programs normally give different gray scales instead of color.

For a related article, query on the following words: A customer has also reported a slightly different problem on an IBM PS/2 Model 70 with VGA graphics and a monochrome monitor. An executed program would not terminate when CTRL+BREAK was pressed and instead hung the computer. Executing a MODE BW80 command under DOS before running QB.EXE or QBX.EXE solved this problem.