Memory modules Psion Series 3

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ram & flash: both sides shown


the older ram needed button cell keep data stable in memory. 1 button cell fitted each module.


the later memory modules, flash , flash ii, did not need battery , cheaper each capacity (both versions continued being manufactured).


the flash modules did have limitation of needing re-formatted entirely reclaim space deleted or modified files; old versions of files deleted or modified continued take space until module formatted. made ram modules more desirable use data stored changed frequently, every change flash module meant writing new version of file remaining space.








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