Perhaps you're thinking of PL/M [0]? I had a brief encounter with it (as sold by Intel) targeting (of all amazing things) the 8051 microcontroller ISA. And ye

Perhaps you're thinking of PL/M [0]? I had a brief encounter with it (as sold by Intel) targeting (of all amazing things) the 8051 microcontroller ISA. And yes: So. Many. Floppy. Swaps. The codegen was not horrendous, but IIRC its price kept it well out of reach of non-commercial users. [0] https://en.wikipedia.org/wiki/PL/M https://en.wikipedia.org/wiki/PL/M