Memory Board Part No :- 51400909-100 Assy No :- 51400910-100 Brand :- Honeywell This is a 1 Megaword memory board for early versions of Honeywell's Universal Station, prior to the introduction of the K2LCN and K4LCN combined processor/LAN interface/memory boards. This board is essentially obsolete for almost all Honeywell installations.