Mouse Detected as PS/2-Style or Bus Does Not Work During Setup

Last reviewed: September 13, 1995
Article ID: Q126632

The information in this article applies to:

Microsoft Windows operating system versions 3.1, 3.11
Microsoft Windows for Workgroups versions 3.1, 3.11
Microsoft Windows 95

SYMPTOMS

When you are setting up Windows, the mouse attached to your computer is incorrectly identified as a PS/2-style or an Inport (bus) mouse and the mouse does not work.

CAUSE

Setup detects mouse ports in the following order: Inport, PS/2, serial. When the detection routine finds the mouse port, it stops searching. For example, if Setup finds an Inport card, it stops searching for the mouse.

Inport Card

If an Inport-style mouse card is installed in the computer, the detection routine sees this card first and uses it, even if the mouse is not attached to it. This occurs because the Inport card is the circuit board for the mouse. Detaching the mouse from the card does not disable the card.

PS/2-Style Mouse

If a PS/2-style mouse is installed, the 0x04 bit is set in the equipment flags. In some computers, the BIOS mistakenly sets this bit when a second hard disk is installed and no PS/2-style mouse exists. When Setup issues an INT 11 (get equipment flags) and sees that this bit is set, it determines that there is a PS/2-style mouse attached to your computer.

WORKAROUND

To work around this problem, use one of the following methods:

For an Inport card, remove the card from the computer before you run Setup.

For a PS/2-style mouse port, contact your computer vendor about a possible BIOS upgrade.

For either type of mouse, run Setup with the /ID switch and choose the proper mouse type when you are prompted.

For either type of mouse, set the correct type in the "MouseType=" line in the MOUSE.INI file before you run Setup. Note that the mouse driver you are using must support the use of a MOUSE.INI file for this method to work. For additional information about the "MouseType=" setting, please see the following article in the Microsoft Knowledge Base:
```
      ARTICLE-ID: Q73370
      TITLE     : Correct Entries for "MouseType=" in MOUSE.INI
```

KBCategory: kbsetup kbhw kbtshoot
KBSubcategory: wpp95 win95
Additional reference words: 95 3.10 3.11 hangs

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Last reviewed: September 13, 1995
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