I wrote about using a 100 MHz Scenix SX microcontroller to act as a disk controller for Apple ][-format diskettes. Allison J Parent <allisonp(a)world.std.com> wrote: Because the Scenix can do it all in software, and costs less than the clever seven-chip Apple solution. And the Scenix won't be limited to only Apple ][ format. If you prefer to build the seven-chip TTL solution, go for it. Different strokes for different folks. Of course, that solution requires a processor with completely predictable execution times, which will make it very hard to do with any modern PC. Unless you want to stick a microprocessor (say, a 6502) on the controller as well, in which case you also need to add memory, etc., and it's no longer a clever seven-chip solution; now it's perhaps a ten-chip solution.