Apple III

The Apple III, stylized as Apple /// and code named "Sara, was a personal computer by Apple Computer, and was targeted towards business users.

The Apple III was released in May 1980 as a high-end successor to the Apple II and cost around $7,800. This computer was full of errors. Apple was going mad over this and well made everyone in the company use it and didn't go down very well. They had to come up with a much better idea.

Apple III Plus
The Apple III Plus, released in December 1983, was a revised version of the Apple III and cost $2,995. The revised Apple III included a digital clock, a re-designed keyboard, video interlacing, rear port connectors, and 256K RAM. The new keyboard was similar to the Apple IIe.

Owners of the original Apple III could get the new logic board as a replacement. A keyboard kit was also made, which included the updated keyboard, cover, keyboard encoder ROM, and logo replacements.

Articles

 * Inside the Apple III by Gabriel Torres at Hardware Secrets (2012-05-31)