Hopefully remembered the actual file this time.
Apart from tweaks and testing, the main change is the file and keyboard I/O code is seperated out into a wrapper file (06wrapper.asm) which other developers may use if they wish.
This is a simplification which is closer to 'C' and the like for file I/O.
Also added are the first two HOWTOs ; the idea is these are zip files containing all the help required to achieve a common task. One is updating the machine, and the other one is cross developing BASIC programs.