1988 · algebraic scientific calculator
HP-27S
in your browser.
A tactile recreation built directly on the original machine. Click the photographed keys, or use your keyboard.
Angle
Memory
TVM registers
0–9 + − × ÷ Enter
Press blue then 9 · TVM for finance
Enter a value, then press its display key to store it.
Press an unknown register’s key to solve.
Cash received is positive · cash paid is negative.
Tap any key on the calculator