Usage of a comma before 'and' (Guest: Tharabg)

My intention is to list all the peripherals, while putting similar items into groups. "Mice" and keyboards belong to the same input device class. Tape drives and disk drives belong to the same input/output device class. Printers have a separate output class. Consoles belong to another class of output device.

Nice to learn from you people!
Now as my final question on this topic, would you consider this sentence also acceptable?

Computer peripherals can include printers, tape drives, disk drives, consoles, and mice and keyboards.

hehehehe! Thanks a lot, guys. So, much, for, the, commas!

The use of a comma before 'and' is rather old fashioned and known, I think, as the 'Oxford Comma'.

It can be found in older text books and older editions of novels etc.

Generally, the trend is to use punctuation as sparingly as possible and not to use a comma before 'and'.

However, there are no hard and fast rules so if you want to use a comma do - it might just seem quaint!

Think of non defining part of the sentence.
We've just arrived, after long trip, and we are very tired.