Until the introduction of SHARP's D.A.L., keying in equations had been a complicated process making scientific calculators difficult to use. Introduced in 1992 and an industry-first, SHARP's D.A.L. allows symbols and numbers of an equation to be entered as they are written. Instead of wasting energy on difficult calculator operations, users are free to concentrate on mathematical concepts.
• Non D.A.L. system key operation You have to push the keys in a different order than the actual equation, making the input process confusing. You push the keys in the same order as the actual equation.
출처 : http://www.sharp-world.com/contents/calculator/features/standard/dal/index.html
Keying in an equation is a complicated process with most scientific calculators, which makes them difficult to use. But with D.A.L., a feature unique to Sharp scientific calculators, symbols and numbers in an equation can be keyed in as they are written, allowing users to concentrate on mathematical concepts rather than difficult calculator operations.
출처 : http://sharp-world.com/sc/excite/calculator/text/non-pro/feature1.html
sin(30) 을 입력할 때
D.A.L 아닌 경우에는 순서로 입력해야 했는데,
D.A.L 에서는 글씨 쓸때처럼 순서로 입력 할 수 있다는 이야기...
카시오에서는 이것을 Visually Perfect Algebraic Method (V.P.A.M.) 이라고 부름.
통상은 Infix Notation 이라고 함(wikipedia 인용)
지금은 대부분의 공학용 계산기가 이러한 방식을 사용
* 참조 : http://en.wikipedia.org/wiki/Calculator_input_methods
* 참조 : http://www.allcalc.org/4075 계산기 입력방식의 분류