These RAM packs once again use the Humble HD61914 4-BIT 1KB RAM chips. Hence there are teo of them on the board. The passive components are for the battery support hardware that keeps the RAM alive when disconnected by the machine. The RAM packs can hold the data for about two years when external the the computer. When internally mounted that time is longer. The capacitor on the board holds the power long enough to allow for changing the battery without losing your data or programs. More data will be added when I have it.