|he is the p50 from 1977, the cheaper and cut down version
of the pr100, its older and bigger brother.
sporting 49 buttons, it looks impressive, but in reality it has no more
functionality than most other scientific models, its just that features
are not on shift keys.
it is programmable, but it has a rather limited 24 step capacity.
despite 3 different conditional branches, you can't do much except
evaluate simple formula. its also quite slow and even some of the manual
operations (like factorial) have a noticeable delay.
it is powered by a pp3, 9v battery and inside there is only 1 chip and
the display, making it cheaper to make.
example program: nim, the matchstick game
here it is after only 27 years!, previously thought not possible: the
matchstick game on a p50. fitting in 24 steps was considered not do-able, but
here it is in only 20. the secret is the branchless logic, developed for the ti-51mk3.
even though the p50 has branches using them makes the program too big.
|enter a starting number greater than 1. this is the number
of matches in the pile. each player takes turn to remove 1, 2 or 3 matches
from the pile and the player taking the last match loses.
enter the start number (eg 10). the p50 plays first. press R/S.
the number displayed (eg 9) is the pile size (so the p50 has taken
1). enter your play (eg 2) press '=' (shows 8 left), press R/S
again and the p50 plays again to display 5 and so on. you can omit
the '=' to play both your round followed by the p50's go.