Q33044: PEN(5) Function in SCREEN 9 Returns Only 0 or 1 with Mouse

Article: Q33044
Product(s): See article
Version(s): 3.00 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist3.00 buglist4.00 buglist4.00b buglist4.50 B_BasicCom | mspl13_basic
Last Modified: 12-DEC-1989

The PEN(5) function returns only a value of 0 or 1 instead of the
actual y pixel coordinate when using the Microsoft Mouse in SCREEN 9,
10, 11, or 12 (which are screen modes with resolutions of 640 x 350 or
greater). This problem occurs both inside the QB.EXE environment and
as a compiled .EXE program.

Microsoft has confirmed this to be a problem in Microsoft QuickBASIC
Versions 3.00, 4.00, 4.00b, and 4.50, in Microsoft BASIC Compiler
Versions 6.00 and 6.00b (buglist6.00, buglist6.00b) for MS-DOS, and in
Microsoft BASIC PDS Version 7.00 for MS-DOS (buglist7.00). We are
researching this problem and will post new information here as it
becomes available.

The problem does not occur in SCREENs 1, 2, 7, 8, or 13, which have
resolutions lower than 640 x 350.

The following program hangs the machine in QuickBASIC 4.00:

SCREEN 9
CLS
PEN ON
true = -1
WHILE true
   x = PEN(4)         'x pixel coordinate
   y = PEN(5)         'y pixel coordinate
   PRINT "X= "x, "Y= "y
WEND

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