There were versions of the Olivetti M21 / M24 which came with a Toshiba 96 tpi 5.25 inch double density floppy drive, sold as 640 kB drives, but instead of 8 they also can be formated with 9 sectors reaching the 720 kb format like 3,5 inch floppies.
But that is just a 8086 machine.
Can you...