HP Forum Archive 19

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TI-58 Slimline Message #1 Posted by ClausB on 25 June 2010, 7:24 p.m. I never liked the bulky shape of the TI-58/9. It was necessary for the 59's card reader but not for the 58. Opening it up shows a lot of empty space. So why not cut it out? A kind forum member sent me some disused case backs and I applied a Dremel cutter and some wet sandpaper. I added a new clear bottom and a cell phone battery. It needs finishing, such as black paint around the edges. It's now only as thick as a TI-84 and I hope to use it as a daily driver, if the battery life allows.

Re: TI-58 Slimline Message #2 Posted by Martin Pinckney on 25 June 2010, 9:27 p.m., in response to message #1 by ClausB Another example of a geek with too much time on his hands. [:-) Where were you 30 years ago?

Re: TI-58 Slimline Message #3 Posted by ClausB on 26 June 2010, 8:53 a.m., in response to message #2 by Martin Pinckney 30 years ago I was programming my 2nd personal computer, a TI-59 (couldn't afford an HP). 1st was a TI SR-56, 3rd was an Atari 400 (couldn't afford an Apple II). Besides, where were Lithium ion batteries 30 years ago? Edited: 26 June 2010, 10:13 a.m. after one or more responses were posted

Re: TI-58 Slimline Message #4 Posted by Pierre Brial on 26 June 2010, 9:36 a.m., in response to message #3 by ClausB Very nice, I love it also. Keep us informed about battery life.

Re: TI-58 Slimline Message #5 Posted by Martin Pinckney on 27 June 2010, 12:03 a.m., in response to message #3 by ClausB Quote: 30 years ago I was programming my 2nd personal computer, a TI-59 (couldn't afford an HP). I was programming a TI-59 myself, my first calculator/computer. A slimmer TI might have appealed to me back then...

Re: TI-58 Slimline Message #6 Posted by BobVA on 25 June 2010, 9:41 p.m., in response to message #1 by ClausB I love it! Very nice work. Edited: 25 June 2010, 9:42 p.m.

Re: TI-58 Slimline Message #7 Posted by Garth Wilson on 26 June 2010, 3:58 a.m., in response to message #1 by ClausB Since it won't hold itself at an angle anymore, now all you need is one of those neat angled desk calculator holders EduCalc used to sell!

Re: TI-58 Slimline Message #8 Posted by ClausB on 4 July 2010, 4:20 p.m., in response to message #1 by ClausB Finally, the back is finished.

Pretty neat!!!! Message #9 Posted by Vieira, Luiz C. (Brazil) on 4 July 2010, 5:56 p.m., in response to message #8 by ClausB Pretty neat!!!! Congratulations! Luiz (Brazil)

Re: TI-58 Slimline Message #10 Posted by Diego Diaz on 5 July 2010, 7:01 a.m., in response to message #8 by ClausB Hi, Nice job indeed. One tech question: Is the Li-Ion battery charger included into the calculator body or is the battery charged by a separate charger/device? Cheers from Spain. Diego.

Re: TI-58 Slimline Message #11 Posted by ClausB on 5 July 2010, 7:54 a.m., in response to message #10 by Diego Diaz I use a broken cell phone to charge the battery. But yours is an interesting idea, if I can remove the charging circuit from the phone or find a small charger. Hmm, I thought I was done with this project!

Re: TI-58 Slimline Message #12 Posted by Thomas Radtke on 5 July 2010, 6:32 a.m., in response to message #1 by ClausB I wonder if that's possible with the 48G housing.

Re: TI-58 Slimline Message #13 Posted by ClausB on 5 July 2010, 8:05 a.m., in response to message #12 by Thomas Radtke The 3.7 V Li Ion battery does 850 mAh, which matches nicely the voltage and capacity of the old 3-cell NiCd packs from HP and TI. I don't know about the 48G, though. In use, the battery does not get as warm to the touch as the 58's DC-DC converter.

Re: TI-58 Slimline Message #14 Posted by Michael Meyer on 5 July 2010, 2:38 p.m., in response to message #1 by ClausB Very nicely done!!!!!

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