Re: Sun optical mice, circa 1985
There was a special mouse pad with horizontal and vertical lines on it.
Yes - though my experience of them was rather later than that (most of the 1990s).
Cold to the touch, and rather unpleasant even at times when cold should have been good. Also moved according to a rather coarse grid, meaning you couldn't steer the pointer between grid points but only move in multi-pixel jumps. Put me right off optical mice for many years, and may have contributed to my RSI.