The A500plus reference article from the English Wikipedia on 24-Apr-2004
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A500plus

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The A500+ is an Amiga computer, basically an extended version of the A500.

It came bundled with:

Commodore created the A500+ for a couple of reasons. The first was cost reduction; minor changes were made to the motherboard to make it cheaper to produce. It was also so that Commodore could introduce the new version of the Amiga Operating system, 2.04.

The plus was released almost in secrecy; many users didn't realise they weren't purchasing anything other than a "normal" A500. Due to the new Kickstart, quite a few popular games failed to work on the A500+, and a lot of people took them back to dealers demanding an original Kickstart 1.3 A500.