The console is a GENIO device. There may be several devices for a version of VFX and the console is being redesigned for v6.
The history system is contained within a GENIO device.
For Windows, see VFXBase/Win64/richedit.fth. For Linux, see Lib/Lin64/Genio/xterm.fth. For MacOS, see Lib/Osx64/Genio/xterm.fth.
For Windows, you will have to move or replicate the history system into the default console.