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Texas Instruments

The TI-55 was one of the first programmable calculator which keeps programs and data in memory, even when it was turned off.

112 pre-programmed functions, including statisticals.

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For over 18 years in engineering, my TI-55-II was my constant companion$ after 29 years, it''s still on my desktop. Just did a search of my library. I seem to have lost the Quick Reference Guide, but I''ve still got the green "SourceBook" with all the program keying instructions.

Saturday 3rd November 2012
Bill Plante

WOW! Just saw your piece on the TI-55-II. Bought mine when they first came out (not the Brazil model). After all these years, it''s the one I use almost every day. It''s a little scuffed, but it works flawlessly and dependably! I change the batteries every 2-3 years. I even still have the case!

Saturday 3rd November 2012
Bill Plante (USA)

I bought one of these when my TI-55 died on me. The quality of this model was abysmal. The buttons were unreliable. It usually took multiple button presses to get them to work and when they did work, many times you would get multiple entries.

About 13 years later I worked at TI and was talking to one of the engineers when the subject of the TI-55-II came up. When I told him I had owned one he asked me if it was any good. I told him that the buttons sucked. He sort of chuckled to himself. I guess they realized that it sucked as well.

Sunday 27th June 2010
Keith (US)


MANUFACTURER  Texas Instruments
TYPE  Pocket
YEAR  September 1981
KEYBOARD  45 keys
RAM  56 steps - 7 memories
TEXT MODES  10 digits LCD display
POWER SUPPLY  Lithium batteries
PRICE  $50

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Ready prompt
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Commodore 64 prompt
Pak Pak Monster
Pixel Deer
BASIC code
Shooting gallery
3D Cubes
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Vector ship

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