"Life it too short to read the manual"

[Albert Chan]

I have a trick to figure out unknown calculator input method

Do 1 + 2 * 3

Chain get 9, which in Cantonese, sound like OLD
AOS get 7, in Cantonese, sound like a swear word (see below)
RPN get 3, which sound like RAW (very nice description for RPN !)

If you get a 4 (say, from Gaxio), it meant DEAD

Hong Kong "election" 2017 for chief executive ... 777 votes
https://www.hongkongfp.com/2017/03/26/77...nese-puns/