Shared Game Data

Civilization’s resident modules and overlays share a common data area called DGROUP. It holds rule tables, civilization state, entity arrays, strings, scratch buffers and the execution stack. Changing the active overlay leaves this state available.

Principal Record Arrays

Offsets below are relative to DGROUP.

The record declarations show their fields. src/GAME.C also defines the 46-entry production table, containing city improvements, spaceship parts and wonders.

Civilization-wide variables track treasury, science and tax rates, technological knowledge and diplomatic relations. The save transfer sequence shows which state is written to disk and in what order.

Larger arrays, including map visibility, power history and the city-name pool, use separate storage. Tile attributes are accessed through screen page 2.