| Max Ram: | 512k |
| Ram Type: | DRAM Chips |
| RTC: | Yes on A500 version, None on A500 version |
| Connection: | A500/+ Trapdoor slot |
512k memory expansion for the A500 and A500+. The A500 version includes a battery backedup clock because the A500+ already has one on the motherboard. You can of course use either version on either the A500 or A500+. They include a memory switch for disabling the additional RAM, primarily for compatibility reasons with old software.