HP42S with non-volatile ram

[toml_12953]

(06-11-2020 04:40 AM)GreyUser Wrote:  Sorry for the narrative wall of text but I don’t see anything here on the subject so here goes:

A while back, I stumbled upon ferroelectric ram while tinkering with the Arduino platform. I got to wondering if they made parallel bus devices rather than the serial SPI part I was using and sure enough, Cypress makes a 32Kx8 part as the FM18W08. It is in the industry standard 28 pin soic package so I thought for $14 and shipping from DigiKey, my 42S is getting some surgery...

If I wasn't happy with the RAM or speed of the 42S, I'd just get a SwissMicros DM42. It has the capability of the 42s plus many extra features, including the features you're looking for.