Zmodem inspired me to rewrite the CP&#x2F;M BIOS routines for reading the floppy drive on the computers we sold at my first job. The floppy format had a sector interleave of 4, which meant 4 rotations to read an entire track. 300RPM is slow enough without cutting it to 75 effective RPM.<p>The interleave was a throwback to the programmed-I&#x2F;O days of older systems; the CPU couldn&#x27;t setup to read the next sector right away, so they solved that problem with an interleave. But the new systems had a DMA controller, so I made the BIOS interrupt-driven and read the sectors out of order but into the correct RAM buffering address. Instant hot rod floppies. Everyone on the team bitched that I &quot;wasted&quot; two days &quot;over optimizing a non-core feature&quot;. You know what though, they all smiled most every time they had to sneaker net something to a different department.