Postfix algebraic scientific calculators still in production

[Zaphod]

(09-13-2018 09:20 PM)Albert Chan Wrote:  

(09-13-2018 11:22 AM)Dave Britten Wrote:  Now that's crazy talk. The BA-II Plus features are decent, but it's pretty unpleasant due to two things: no rubber feet (it slides all over your desk), and awful keyboard response with no two-key rollover, that will leave you with missed keystrokes at a very low threshold for "fast typing".

What is two-key rollover ? Why missed keystrokes without it

Some cheap keyboard scanning would miss keys if you’re still pressing the previous one