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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