Upgraded the mouse on my 486 to a Logitech MouseMan 3-button.
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Way better than the BSR BX400 it replaced!
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The trick being, the BSR is the only serial mouse I have, but the MouseMan is the only PS/2 mouse I have that is compatible with a serial adapter.
The biggest issue with the BSR is the high effort button presses. The muscle at the base of my index finger was cramping up after just a few minutes of use.
note: both pics are sourced from Google Images. Too lazy to take photos, email them to myself, then crop and post here. 😊