the Apple Lisa wikipedia entry mentions a technical limitation I've never heard about - real time clock has a 4-bit integer for the year. from https://en.wikip

the Apple Lisa wikipedia entry mentions a technical limitation I've never heard about - real time clock has a 4-bit integer for the year. from https://en.wikipedia.org/wiki/Apple_Lisa#Hardware https://en.wikipedia.org/wiki/Apple_Lisa#Hardware: "The real-time clock uses a 4-bit integer and the base year is defined as 1980; the software won't accept any value below 1981, so the only valid range is 1981–1995.[18] The real-time clock depends on a 4 x AA-cell NiCd pack of batteries that only lasts for a few hours when main power is not present. Prone to failure over time, the battery packs could leak corrosive alkaline electrolyte and ruin the circuit boards"