After the huge success of the Amiga 500, Commodore launched a new version of the machine called the Amiga 500 Plus. Some small changes were made to reduce costs and a few hardware changes were also made. It featured 1 MB of memory, the new ECS chipset and a new version of AmigaOS which wasn't 100% compatible with software written for older versions.
While not officially introduced until 1992, the A500+ made a covert appearance late in 1991. Commodore apparently sold out of A500s towards the end of the year, so an unusual step was taken. The new A500+ motherboards were already in production and were placed in the old A500 cases and sold as A500s to meet demand before the launch of the new model. The only problem was that Commodore didn't tell anyone what they had done and many new users were left wondering why some Amiga software wouldn't run on their new computer.
The A500+ has the shortest lifespan of any Amiga ever made, it was only on sale for around six months. One way to describe the A500+ is as a mass market prototype, due to the incredibly short lifespan and the fact that the brand new version of AmigaOS was updated so quickly for its successor, the Amiga 600.
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Amiga 500 Plus
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Built-in keyboard, 96 keys
7.09379 MHz (PAL) 7.15909 MHz (NTSC)
ECS based chipset: 8375 Fat Agnus (memory controller and blitter), 8373 ECS Denise (video control chip), 8364 Paula (sound & I/O), 5719R2 Gary (I/O)