DATAMATH  CALCULATOR  MUSEUM

Canon LC-MEMO a.k.a Palmtronic LC-MEMO

Date of introduction:  September 1978 Display technology:  LCD (yellow)
New price:   Display size:  8
Size:  4.6" x 2.5" x 0.35"
 118 x 64 x 9 mm3
   
Weight:  2.2 ounces, 62 grams Serial No:  3015998
Batteries:  3*LR44 Date of manufacture:  year 1978
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8  Integrated circuits:  Toshiba T3721, T3691
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Toshiba introduced with the LC-836MN the first portable electronic Databank on the market. Competitor Canon followed soon and designed with the LC-MEMO a similar device in a much smaller housing.

LC-Memo_PCB.jpg (59677 Byte)Dismantling the LC-MEMO reveals indeed a chipset manufactured by Toshiba, too. The original T3690 was replaced with the T3721 in the Canon product, but the memory chip was kept. The T3691 stores a maximum of 21 information items in units of 8 alphabetical characters and 12 numerals each. If you add the bits together you end with a total amount of 2048 bits or 256 bytes.

The alphanumeric display uses an unusual 8-segment layout with one additional segment to the standard calculator layout. The display on the right reads "DATAMATH". It is obvious that the additional segment enhances readability of the letter "M" compared to the LC-836MN. 


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

Joerg Woerner, February 28, 2004. No reprints without written permission.