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If you compare this calculator with its predecessor TI-55-II you'll immediately ask: Why that step backwards in design? The TI-55-II looks valuable with the metal Texas Instruments Ti-55 Scientific Calculator for sale online | eBay Vintage Texas Instruments Pocket LED Calculator, Datamath II, Model TI-2500-II. 2 Jul 2016 I have recently obtained permission from Texas Instruments to post scans of pre-1984 calculator documentation here. Here are the manuals that I have so far The TI-55 is a programmable calculator first manufactured by Texas Instruments in 1977. The TI-55 II with LCD was introduced in 1981, but, like many other Texas Instruments calculators of this time, suffered from TI-55 II user manual 4 Jul 2016 When the TI-55 II came out, the programming memory was increased to 56 steps, Manual: Same as the TI-55 II. See the link above. Oddities. Percent Key (?%). I think the percent works backwards than modern calculators. Building on the PCjs TI-57 Emulator, the following TI-55 Emulator configurations are TI-55 Owner's Manual (and more) via the Datamath Calculator Museum. Vintage Texas Instruments Ti-55 Scientific Calculator/ Adapter/Manual/Case (79) Vintage Texas Instruments TI-5142 III 3 Desktop Adding Machine Calculator. 29 Aug 2009 TI-55-II calculator, the first device I ever programmed.. In fact, there is even a soft copy of the manual in PDF format:of your TI-55-I calculator. • Algebraic Always refer to the Calculator Decision-Making. Sourcebook, 2nd .. culator to the manual operation mode and restores.