After several delays, the first batch of bite-sized Raspberry Pi computers, designed to encourage children's interest in programming, is finally ready for delivery.

After several delays, the first batch of bite-sized Raspberry Pi computers, designed to encourage children's interest in programming, is finally ready for delivery.

Announced at the beginning of February, the Raspberry Pi is the size of a credit card and costs just $35. It plugs into a TV or keyboard, and can be used for word processing, games, and also plays high-definition video. Those among the first to place an order will receive their Raspberry Pi by April 20, the BBC is reporting. Delivery of the tiny computer has been delayed twice, once because of a — the wrong component was soldered onto circuit boards — and a second time due to a mix-up with testing.

"We are delighted to have the first batch of fully compliant products in our warehouse and to be able to invite the first wave of customers who registered for a Raspberry Pi to place their orders from this initial stock," Glenn Jarrett, head of electronics marketing at distributor RS Components, said in a statement.

But supply of the teeny tiny computer is still limited. Only a portion of those who already registered for a Raspberry Pi will receive an invitation to place an order. All orders are currently limited to one per customer.

Full production quantities are expected later this year. At that time, customers will be able to order multiple quantities.

"There has been a great deal of anticipation for Raspberry Pi since its launch at the end of February, and it is important that we provide a delivery guarantee to customers when they place their order," Jarrett said.