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Q35356: SCREEN 0 "Illegal Function Call," MCGA Only Supports 4 Pages

Article: Q35356
Product(s): See article
Version(s): 4.00 4.00b
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist4.00 buglist4.00b fixlist4.50 B_BasicCom | mspl13_basic
Last Modified: 11-DEC-1989

The "Microsoft QuickBASIC 4.0: BASIC Language Reference" manual states
on Page 380 under Table R.12 that the IBM MCGA graphics card supports
eight pages in screen mode 0 (text mode). However, an "Illegal
Function Call" will result when trying to access video pages 4 through
7.

Microsoft has confirmed this to be a problem in QuickBASIC Versions
4.00 and 4.00b and in Microsoft BASIC Compiler Versions 6.00 and 6.00b
for MS-DOS and OS/2 (buglist6.00, buglist6.00b). This problem was
corrected in QuickBASIC Version 4.50 and in Microsoft BASIC Compiler
Version 7.00 (fixlist7.00).

Note that versions of Microsoft QuickBASIC earlier than Version 4.00
do not support the MCGA.

The following is a code example:

for i=0 to 7
Screen 0,,i
next i

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