This solid state memory ROM card is used in Honeywell's Basic Controller. This version of the card is required to implement ST/DC (Smart Transmitter / Digital Communication).

The ROM on this card contains the programs that the processor must execute in order to perform the control functions of the Basic Controller.

The card also contains volatile RAM, used to store data such as ranges, constants, configuration, tuning constants, etc. This card has no LED's or jumpers. This version of the Solid State Memory card, as well as some revisions of the earlier 30750218-009, are LCN-compatible.