MODE Does Not Set 2 Stop Bits Correctly PSS ID Number: Q63598 Article last modified on 07-14-1993 PSS database name: O_MSDOS
4.00 4.01 4.01a
MS-DOS
| The information in this article applies to: |
| - Microsoft MS-DOS operating system versions 4.x |
Summary:
The MS-DOS versions 4.0, 4.01, and 4.01a MODE command does not set the stop bits correctly when you specify 2 as the number of stop bits.
The “Microsoft MS-DOS User’s Reference” documents 2 as being a valid value for the stopbits parameter. However, when the number of stop bits given is 2, the MODE command sets the port to 1 stop bit. MODE does report that the port has been set to 2 stop bits.
The following MODE command
MODE COM1:9600,n,8,2
reports the following:
COM1: 9600,n,8,2,-
However, the COM1 port is actually set to 9600,n,8,1.
Microsoft has confirmed this to be a problem in MS-DOS versions 4.0, 4.01, and 4.01a. This problem does not occur in later versions of MS-DOS.
Additional reference words: 4.00 4.01 4.01a noupd
Copyright Microsoft Corporation 1993.
