What are SRAM cards?
These are credit-card sized memory cards that are used to transport the data from a PEM to a computer – you can think of them as behaving something like a floppy disk. SRAM (Static Random-Access Memory) cards contain memory chips and a tiny lithium battery. They come in several sizes, the most popular being the 1 and 2 MB cards. The 1 MB card can hold the data from 8 PEM’s while the 2MB card can hold the data from 16 PEMs.