We used these:
This doesn't show it, but each one of these in my county has a keypad and headphones where vision impaired voters can cast their votes. I found this photo:
We have a list of all the systems that are used in my state for this election.
https://votingsystems.cdn.sos.ca.gov/oversight/county-vsys/vot-tech-by-counties-2020-11.pdf
Some counties have ballots printed on demand at the polling place, some have ballots printed on demand at the elections office, but some don't list any at all. I read somewhere that if paper ballots are exhausted, they're supposed to be able to deliver paper ballots within 2 hours.
Quite a few counties list the polling place/vote center tabulation as "Same as Vote-by-Mail (Central Tabulation)". So some counties are still doing it the old fashioned way where paper ballots are dropped into a box, not checked for correctness (just like a mail-in ballot) onsite, and then transported to a central counting facility. I was under the impression that most polling places these days had them counted onsite so that poll workers could report precinct totals at the end of the day. But even large counties like Los Angeles and San Diego County do it the old fashioned way.