A list of everything you need to know. Maybe...
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From the RAM, through to Wifi and real time clock components, there is an excellent thread maintained by the community here viewtopic.php?f=6&t=544#p2373
ZX80, ZX81, Spectrum 48K, Spectrum +2, QL, Atari 130XE, Atari ST, Atari Falcon, Acorn A3000..