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|
|Program steps:||Courtesy of:||Joerg Woerner|
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.
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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© Joerg Woerner, February 28, 2004. No reprints without written permission.