Center for Computing History's
Interactive History of Programming

#3. Interfaces

Some of the earliest computer interfaces were for cash registers, can you fix the one below so that the prices and tax are correct?

Interface

Code:

Burger onClick=

Salad onClick=

Drink onClick=

Tax onClick=

Clear onClick=

Electronic calculators, beautiful things, can you impliment the broken memory-set (M) and memory-recall (MR) buttons?

Interface

Internals:

total:

op:

showing:

memory:

Code:

M onClick=

MR onClick=

Number onClick=

Math onClick=

Clear onClick=