Texas Instruments TI-18 SLR

Date of introduction:  1985 Display technology:  LCD
New price:   Display size:  8 
Size:  4.8" x 2.6" x 0.40"
 121 x 66 x 10 mm3
Weight:  1.6 ounces, 46 grams Serial No:  179113
Batteries:  n.a. Date of manufacture:  mth 06 year 1985
AC-Adapter:   Origin of manufacture:  Taiwan (C)
Precision:  11 Integrated circuits:  Toshiba
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual: (EU: 1.2 MByte)

If you feel familiar with this rare scientific calculator sporting the [1/x], [x2], [sqr X] and [pi] keys, view the SR-11 introduced already in 1973 and combine it with the TI-30 STAT.

Dismantling this TI-18 SLR manufactured in June 1985 by a non-disclosed OEM (Original Equipment Manufacturer) in Taiwan reveals a clean design centered around around an unknown Toshiba single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by four solar cells.

Inspecting the PCB of this TI-18 SLR calculator brought our attention to a small mark reading S33T-10, we discovered already similar marks reading S32B-II and S39A with the TI-108 resp. TI-1895 II. The Date code C-0685 located on the back of the featured calculator and the PCB-Mark S33T suggests a design of Kinpo Electronics, Inc., manufactured in their Cal-Comp Electronics plant. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

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Joerg Woerner, May 13, 2002. No reprints without written permission.