How do I operate the computer

Hint 1 of 10:

Remember old-fashioned computers?

Hint 2 of 10:

They used punch cards to operate.

Hint 3 of 10:

There's a slot you can feed them into.

Hint 4 of 10:

Did you read the business card in the mailbox?

Hint 5 of 10:

Do you remember ROY G BIV?

Hint 6 of 10:

They were the colors of the rainbow.