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Toshiba SLC-8260

Date of introduction:  1978 Display technology:  LCD
New price:  DM 70.00 Display size:  8 (5 + 2)
Size:  5.2" x 2.9" x 0.4"
 133 x 73 x 10 mm3
   
Weight:  2.8 ounces, 80 grams Serial No:  F15105
Batteries:  2*LR44  Date of manufacture:  year 1978
AC-Adapter:   Origin of manufacture:  Japan
Precision:  9 Integrated circuits:  Toshiba PN1033734
Memories:  1    
Program steps:   Courtesy of:  Ernst Mulder

You are familiar with this calculator? It is almost identical to the TI-25, the first scientific calculator using a LCD display marketed by Texas Instruments. Compare them yourself.

SLC-8260_PCB.jpg (131913 Byte)The internal design of the SLC-8260 doesn't look like the usual Toshiba design. We are missing details like the battery holder found in the LC-834WA.
Nevertheless there are other important details inside the SLC-8260. The printed circuit board was manufactured by
Sansyu, a well know company since we dismantled some TI-1750 calculators.

SLC-8260_IC.jpg (135630 Byte)The next surprise could be found on the calculator chip found inside the SLC-8260, it is the same unusual
PN1033734 numbering found inside a late TI-25.

The SLC-8260 was soon replaced with the SLC-8261 but continued to live under a different badge - discover the Sears LC89. The SLC-8280 makes use of a similar design style. 

Don't miss the SLC-8290WA adding some metric conversion functions, a clock with two alarm-times and a stopwatch.

Fellow collector Frans Pop reported recently, that the SLC-8260 calculator returns a wrong result of [7] [yx] [8] = 5764800 instead the correct result of 5764801. We expect a lousy implementation of the logarithm function in this design. Read more about the Logarithm Bug


 

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

Joerg Woerner, July 1, 2002. No reprints without written permission.