Just in case naay ganahan ani, its a graphing calculator made by Texas Instruments. Its been stashed away sa akong cabinet for a few years now hehehe... I was using this back in my college days sa US. I've just put some fresh AAA batteries in it, and it still works
Kita ko sa updated version ani sa national bookstore once, Ti-84 plus, it was 12k
selling for 2k
here are some pics:
for the Manual, naay daghan ma download sa internet. napa gani step-by-step instructions on how to use.
pm lang if interested.