I have a 286 which connects through a COM (serial) port. Its mouse also has a ball since solid state lasers hadn't been invented
I'm very glad those mouses are maintainable and seem to last forever
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We had 300 ohm ribbon back when we had VHF TV. When we went to UHF in the '90s we also changed to coaxial cable
Coaxial cable works better at higher frequencies than 300 ohm, but needs shielding. 300 ohm doesn't need shielding as any wave that hits it hits phase and anti-phase at the same time and has no effect