what is the sierra madre casino based on

A cashier hologram appears behind the cashier's window that exchanges pre-War money for Sierra Madre chips. Once the power is activated, the security holograms disappear and hologram dealers become visible behind the blackjack tables and roulette wheels, making the Casino games available to play. There are three security holograms patrolling the inside of the casino: one near the entrance and the bar stairs, another in the second floor office area, and a third by the electrical closet and cashier counter.

The casino floor has three exits: the main double-doors to the hotel lobby, another upstairs on the second floor southwest past the offices (that leads to the west end of the second floor Lobby), and the third exit is behind the medical office on the third floor and down a few steps (that leads to the east end of the second floor lobby).

On the third floor there's the locked entrance to the Cantina Madrid kitchen, another security office with a hologram control terminal for the office guard, a medical office with an auto-doc, and through that, a small set of stairs down to a door. Behind the bar is a corridor with a stairway to the third floor straight ahead, and the personnel and security offices to the right (west). Stairs near the entrance lead to the second floor lounge area with a bar. The main floor of the casino has the gaming tables and machines, cashier counter, electrical closet, and a Sierra Madre vending machine in the center of the room.

What is the sierra madre casino based on