OSMK1201 - SYS1201 ERROR MESSAGE FOR VMOUSE.SYS IN OS/2 WARP
01/23/96

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          SYS1201 Error Message for VMOUSE.SYS in OS/2 Warp
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Please Read Entire Document for Full Explanation of Procedures
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DESCRIPTION

The following message is received:

   SYS1201: VMOUSE.SYS not installed. Line *** is ignored.

RESOLUTION

The Installation program did not detect the presence of a mouse, or it 
detected the presence of a mouse, but could not determine what type of 
mouse it was. (It does not mean that VMOUSE.SYS was not installed, as 
the message implies.)

Note: Make sure you have a backup of any file you intend to change.

Check the size and date of MOUSE.SYS. For OS/2 Warp, it should be 17387 
bytes and dated 10-3-92. If it is not:

1. Insert the Installation Diskette in drive A;

2. Turn on the computer, or press Ctrl+Alt+Del if it is already on.

3. When prompted, remove the Installation Diskette from drive A and
   insert Diskette 1; then press Enter.

4. When the Welcome screen appears, press F3 to get to a command prompt.

5. Type COPY A:MOUSE.SYS x:\OS2\BOOT and press Enter (x is the drive
   where OS/2 is installed).

An undetected-mouse problem can also be due to other reasons:

* An unsupported mouse type: 

  1. Check to see if there are any DIP switches on the mouse. Some mice
     have settable switches that put them in Microsoft Mouse emulation
     mode.
                                                       
  2. Determine what mouse driver was being used in DOS. If it is not
     the MOUSE.COM provided by DOS, the mouse might be operating in a
     proprietary mode.
                                                       
* An interrupt conflict:

  Check the interrupts. On an AT-bus system, a serial mouse can be
  installed only on COM1 and COM2, and only if they are at the standard
  I/O addresses and IRQs:

     COM1 = 3F8, IRQ4
     COM2 = 2F8, IRQ3
 
  1. Check the documentation for the I/O adapter to make sure it is set
     correctly to industry standards.

  2. Ensure that no other adapters are sharing the IRQ of the COM port
     that the mouse is connected to.
                                 
* Mouse driver or port changed:

  If you had mouse support during the graphical portion of the
  installation process, you probably changed the mouse driver or port
  that OS/2 had selected.

  Run Selective Install and select a different driver.

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