A turn-based system that (tries to) appear real-time.
The first video game about Pseudo real-time was released on December 21, 1998.
Likely implemented in that turns pass automatically as time passes regardless if player does anything on them. The turns may be "hidden", actions may have some adjustment on when they're done (some random moment while turn passes) to avoid looking as if they're done like in a clockwork (actual turn-based system). Like with most real-time strategy games, these likely have some automatic behaviour for idle characters. A small command queue may exist, so when a character is in middle of performing an action (and therefore taking their turn), the player's commanded action is queued to be performed on the next turn.