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Chris Dreher · (This post was last modified: 05-27-2017 07:05 AM by Chris Dreher.)

There are also FRAM cards, available sometimes on eBay in 128KB and 512KB sizes. These are also bear circuitboard cards. Unlike a normal RAM card that requires a small battery to preserve data when the card is removed, a FRAM card does not require a small battery to preserve its data. The downside is that FRAM is a new technology and thus these cards cost more that typical. Also, because FRAM is new technology, some folks are unsure about it.

There is a long thread about HP48 FRAM cards here: http://www.hpmuseum.org/forum/thread-6562.html

FYI, I have not tried out any FRAM cards to verify them but suspect they are just fine to use.