On 09/06/2017 02:19, Toby Thain wrote: > I wrote a lot of BBC BASIC. DIM(9) allocates ten elements, 0..9, Yes, all versions (of which there are at least nine, going back to 1981), and so too does its predecessor, Atom BASIC. Indexing from zero was the norm in 1970s/1980s BASICs. -- Pete Pete Turnbull