DEC VT240 terminal

1) One site i looked at said a VT240 is a monochrome unit, a VT241 is the colour version. Is the only difference the monitor? Can I use a colour monitor with my base unit?

3) How much is known about the insides? Of course I've taken it apart. It's really easy to get inside, just undo 2 screws on the bottom at the very front and remove the top cabinet shell (lift it up from the front). Then release 2 nylatch fasteners and lift up the metal screening cover. The PSU (a switch-mode unit) is inside the cover. Reach inside and unlug the PSU ribbon cable from the mainboard and remove the cover/PSU. The mainboard comes out by releasing 3 more nylatch fasteners. On this board, there's an 8085, 2681 (dual serial chip), 8251 (USART, maybe used for the keybaord interface), 7220 (graphics chip) -- along with what seemms to be much the same circuitry as a Rainbow colour card, there are a couple of PALs, I've not checked to see if they're the same as the ones in the 'bow. Pletny of RAM and ROM, and some glue logic. And another 40 pin chip, DC310. For some reason this is saying 'processor' to me. Is it?