BBC BASIC had an inline 6502 assembly feature that was as simple as doing this anywhere in your BASIC program (but not in the middle of a BASIC statement, obvio

BBC BASIC had an inline 6502 assembly feature that was as simple as doing this anywhere in your BASIC program (but not in the middle of a BASIC statement, obviously): [ asm_statements ] That is, open square bracket, then write your assembly statements (one per line, as usual), then close square bracket. That's it. No assembly step required.