Known problems :
- (nearly fixed) Only last answer should be printed, not intermediate expressions
- numéric answers should be rigth aligned
- Implements more error than just "Syntax Error": Arg error, Div by Zero, ....
- Char with code >= 256 (UTF-16 character table) are not usabel in strings
- Lot of missing chars in hiResConsoleFont / hiResGfxFont (and probably in lowRes font too)
- Lot of missing instructions ... but it's normal as there is plenty of work to do.