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Texas Instruments TI-58C Pool Water Analysis

Date of introduction:	1979	Display technology:	LED-stick
New price:		Display size:	10 + 2
Size:	6.4" x 3.2" x 1.5"
Weight:	8.5 ounces	Serial No:
Batteries:	BP1A	Date of manufacture:
AC-Adapter:	AC9131	Origin of manufacture:	USA
Precision:	13	Integrated circuits:	TMC0501E, TMC0591, CD2400, CD2401 TMC0573, TC5047
Memories:	0-60
Program steps:	480-0	Courtesy of:	Mark Bollman

The main disadvantage of the TI-58, the non-permanant program storage was corrected with the TI-58C. Using a low-power C-MOS memory (a Toshiba TC5047 in this machine) battery drop caused by the NiCd's itself was quicker than drop caused by the memory.

The TI-58C continued the usage of the Solid State Software Modules™ with up to 5000 program steps introduced with the TI-58 and TI-59 already in 1977. On the backside of the TI-58/59 you'll notice a small lid with a place for a module. The Master Library with 25 different programs was included, a lot of other modules were available. We know four different approaches of the module expansion:

	Standard modules like the Master Library use only the small sticker above the A,B,C,D, and E keys.
	Other modules like this Pool Water Analysis developed by Olin Corporation make use of a colourful keyboard mask.
	Customized calculators like the USMC AV-8C calculator or insurance calculators sold by Allianz and others use special keyboard arrangements.
	The CAL-Q-TAX calculator uses an extender instead the usual drop-in modules.

The calculator was available till the year 1983.

If you have additions to the above article please email: joerg@datamath.org.