The Model II BASIC was similar to Level III Disk BASIC on the Model I / III, but had cassette support removed and incorporated several enhancements from the then-latest version of Microsoft BASIC-80, which included enhanced string-handling features, an improved editor, octal number conversion, and error-trapping.
12.
:: : : : It seems that Ben was indeed correct that \ 307 and \ 304 correspond to G and D . . . I wasn't looking at it as if it was octal numbers, so wasn't expecting it to " skip " some of them ( e . g . from 307 to 310 ) but it makes sense now.