Q37405: "Device I/O," Error 57, Using SCREEN 3 and Communications Port

Article: Q37405
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist4.00 buglist4.00b buglist4.50 B_BasicCom | mspl13_basic
Last Modified: 10-NOV-1989

Programs that use both Hercules SCREEN 3 and the communication port
("COM1:" or "COM2:") may generate "Device I/O" errors (error 57). For
example, one customer reported that the faster he drew to the Hercules
graphics screen, the more frequently he got the "Device I/O" error.
The same program will run correctly if a CGA, EGA, or VGA card is
used. It will also work correctly if text mode is used (screen 0).

Microsoft is researching this problem and will post new information as
it becomes available.

This information applies to Microsoft QuickBASIC Versions 4.00, 4.00b,
4.50 and to Microsoft BASIC Compiler 6.00 and 6.00B (buglist6.00,
buglist6.00b) for MS-DOS.

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