The Apple Graphics Tablet (left) was released in 1979 and cost $650. It connects to any Apple II and can be used to draw images at a resolution of 280 by 192 pixels. The tablet draws power directly from the Apple II and cannot be used when disconnected.
The Apple II was originally designed to be used with televisions rather than computer monitors, but the Apple Graphics Tablet produced interference that could disrupt reception of television signals. A later model was identical to its predecessor except for one notable new feature: FCC compliance.
The Apple iPad (right) was released in 2010 in six models ranging from $499 to $829. Equipped with a 1-GHz A4 system-on-a-chip and a 16GB, 32GB or 64GB flash drive, it syncs with any Macintosh or Windows machine capable of running iTunes and can run thousands of iOS applications. Its resolution is 1024 by 768 pixels on a 9.7-in. LED-backlit glossy widescreen display.