The Mac LC/Performa 580 shipped with 4 MB soldered on the motherboard and two 72-pin SIMM sockets for memory expansion – twice as many as the LC 550 and 575 – for up to 52 MB total system memory, the most possible in any 500-series Mac. Like other 500-series Macs, it has a slide-out motherboard.
In 1992, Apple decided that the education and design markets weren’t enough – it wanted to target mass market consumers. Rather than develop new computers for this market, Apple created a new brand and renamed three existing Macs as Performas.
2000 – Can I put an LC 580 motherboard into my LC 575 in order to break the 36 MB RAM barrier?