Only have hands-on experience with a slimmed down cousin, the Acorn Electron. Its Basic has a built-in assembler, which lets you mix Basic & assembly as desire

Only have hands-on experience with a slimmed down cousin, the Acorn Electron. Its Basic has a built-in assembler, which lets you mix Basic & assembly as desired. Iirc you'd just inline the assembly, reference Basic variables for input & output values, and RUN the combined program like any other. No separate assembler or handcoding + POKEs required. Very nifty feature that I hadn't seen before in other home computers of the day.