> 1296 PRINT "THIS PROGRAM REQUIRES ADVANCED BASIC -- USE COMMAND 'BASICA'":COLOR 15,0,0:FOR I=1 TO 9000:NEXT: RESUME 1298

TIL there is an “Advanced Basic”. I hope the naming was tongue in cheek.

Not tongue in cheek, but called that to distinguish it from ROM BASIC. AFAIK, Advanced BASIC had to be loaded from the DOS disk and mostly added disk management and graphics features.