DATAMATH CALCULATOR MUSEUM
Casio AL-8 Electronic Calculator
|Date of introduction:||October 1975||Display technology:||Fluorescent|
|New price:||Display size:||8|
|Size:|| 5.5" x 3.2" x
140 x 82 x 24 mm3
|Weight:||4.9 ounces, 140 grams||Serial No:||1175283|
|Batteries:||2*AA||Date of manufacture:||mth 11 year 1975|
|AC-Adapter:||AD-4145||Origin of manufacture:||Japan|
|Precision:||8||Integrated circuits:||NEC uPD573C|
|Program steps:||Courtesy of:||Joerg Woerner|
Casio Computer Co., Ltd introduced its first handheld calculator, the Casio Mini, already in 1972. The Casio AL-8 and its sibling AL-10 sold in 1975/76 were the first hand-held calculators operating and displaying fractions.
At first glance you won’t notice a dedicated [a b/c] key known from e.g. the Texas Instruments Galaxy 10 introduced in 1988 or the current TI-30 Xa. Instead you’ll locate a [P] key for six pre-programmed functions accessible through a larger slider switch called "Function Mode Selector":
|• SQR||[P] extracts the square root|
|• GT||[P] recalls the total accumulated by the [=] key|
|• rem||[P] obtains the reminder while the [=] key gives the integer answer in a division|
|• a b/c||performs fraction calculations and converts the answer to the decimal scale|
|• hms||[P] performs time or angle calculations and converts decimal answers to the sexagesimal scale|
|• SD||[P] retrieves the standard deviation in statistical calculations|
Dismantling this Casio AL-8 manufactured in November 1975 reveals a clean design centered around a NEC uPD573C single-chip calculator circuit.
The Casio AL-8 was soon replaced with the AL-8S sporting a dedicated [a b/c] key
for the fractions and the capability to add and subtract dates.
Read more about the TI-30Xa Solar School Edition for Virginia with the missing [a b/c] key.
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© Joerg Woerner, May 15, 2011. No reprints without written permission.