The '''standard''' memory expansions are often credited to [[Dk'tronics]] and [[Dobbertin]] (not sure which company initially developed it though). There's also an '''extended standard''' which may be credited to probably [[YarekRAM7]] (seen at least in comp.sys.amstrad.8bit FAQ v0.90, 11 september 1997) or [[RAM7Yarek]] (not sure who came first here, too).
== Technical ==
== Extended-Standard Expansions ==
* [[CPC4MB]] ([[Yarek]]) (DIY) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 3.5 MBbyte)
* [[RAM7 2MB memory expansion]] ([[RAM7]]) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 1.5 MBbyte)
* [[CPC4MB]] ([[Yarek]]) (DIY) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 3.5 MBbyte)
== Semi-Standard Expansions ==