DATAMATH CALCULATOR MUSEUM

Texas Instruments TI-5135

Date of introduction:	1980	Display technology:	Fluorescent
New price:	$74.95 (SRP Sep. 1980)	Display size:	10
Size:	7.7" x 7.2" x 1.9"	Printer technology:	Thermal TP-20225
Weight:	2 pounds 1 ounces	Serial No:	0014072
Batteries:		Date of manufacture:	wk 47 year 1980
AC-Adapter:	120 V	Origin of manufacture:	USA (ATA)
Precision:	10	Integrated circuits:	TMC0263
Memories:	1 + 1
Program steps:		Courtesy of:	Joerg Woerner
		Download manual:	(US: 5.4M Bytes)

The TI-5135 was introduced as an economical printing calculator for office and home. It features a 10-digit display and a thermal printer quiet enough to be uses at home. Beside the usual 4-function memory an independent add register is available.

Dismantling this TI-5135 manufactured in 1980 reveals an internal construction very similar to the TI-5040 introduced in 1976 and the PC-100 printing cradle introduced already in 1975.

The electronics of the TI-5135 is centered around the TMC0263 calculator chip, obviously the third member in a line of customized solutions for printing calculators. We identified so far:

Integrated Circuit	Introduction	Printing Calculator
TMC0261	1976	TI-5040
TMC0262	1978	TI-5025
TMC0263	1980	TI-5135

The TI-5135 was the last Texas Instruments printing calculator based on their own technology, the successor TI-5130 - followed within one year - was designed around an impact printer for plain paper and manufactured by Toshiba TEC Corp. in Japan. The TI-5040 II introduced in 1982 used once again thermal printing technology.

The TI-5135^B introduced in 1988 was manufactured in Taiwan, PRC.

Find here an excerpt from the Texas Instruments Incorporated leaflet CL-199J dated 1981:

TI-5135

Economical printer/display calculator for office and home.

Especially designed for business executives so it has all the features an executive needs. That means having both a display for fast calculations and a tape produced by a thermal printer.
Use the display alone or display plus printer when the job demands it. The 10-digit display is easy to read with commas and decimal point. The thermal printer is quiet enough to use when you’re on the phone, and it eliminates ribbon and ink.
You’ll make quick work of most problems with features like: Four-function memory and independent add register for “dual-memory” capability. Add register also makes the extensions, cross-footing, and invoices easier, Automatic constant. And percent key.

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