FFIX for PSX would have been written in C (or possibly C++) with PSY-Q. It will not be one program - those games were composed of multiple overlays that are banked in / out over the PlayStation's limited memory.
From what I know the PC release was a port to a new framework, which supports the same script engines, but otherwise is fresh code. This is how it can support mobile, widescreen, Steam achievements etc.
FFIX for PSX would have been written in C (or possibly C++) with PSY-Q. It will not be one program - those games were composed of multiple overlays that are banked in / out over the PlayStation's limited memory.
From what I know the PC release was a port to a new framework, which supports the same script engines, but otherwise is fresh code. This is how it can support mobile, widescreen, Steam achievements etc.