Ok, Its been busy lately, but I have looked over the unit. It has just 2 eproms. There are 4 slots but just the left 2 slots have eproms. The top eprom reads

DCS Compact (STA)
Main U3 50BF
V 2.4 000306

Second (lower) eprom reads
DCS Compact (STA)
Main U4 7E9A
V 2.4 000306

Since there are 2 eproms, I am going to assume its the caller ID software. So, I have checked with a few online people, and the RAM 2 pack is hard to come by. I noticed this website has them listed so I may try to get it here.