The Armada 7770DMT came with 16MB soldered on the system board, as well as a 16MB upgrade in the first of the 2 memory expansion slots. That means that this system has a 32MB upgrade in the second expansion slot for a total of 64MB.
The system is upgradable to 144MB if you remove the memory in the two slots and add 2 64MB upgrades (Compaq part# 277706-003).
Todd