The PA501 is a modern re-creation of an Amiga 500/500+ trapdoor memory board. It is very similar in function to a Commodore A501 from the 1980s, providing 512 KB / 1 MB of memory and a real-time-clock (RTC). Many original A501s have become damaged from battery acid leakage, so a modern replacement is created here. If you purchase the 1MB variant and install it in an A500+ it will provide 1 MB of extra memory, giving a machine total of 2.0 MB CHIP RAM, the maximum possible. The PA501 board is being sold without a battery, but it takes a very common CR2032 coin cell, which you can buy at any hardware store. The developers have put an effort into design and component selection to ensure the RTC uses a minimal amount of power. A good quality 240mAh lithium cell will last around 6 years! A battery is not required for the memory to work. You can purchase the PA501 on Ebay for just € 42

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