BASIC now has a copyright date of 1988 and the MOS version number is 3.50.

It's very interesting to think that the MOS 3.50 ROM came out in 1989 at a time when Acorn were ploughing ahead full swing with the Archimedes, RISC-OS and all things 32-bit. It's rather nice to think that they still had a bit of time to devote to the dear old BBC micro.