Thanks for clarifying why USB is worse than LPT in this case I was always wondering. It is why the buffer on emulated UARTs ballooned to several kB. This simple drivér design has pérsisted for decades bécause it works. LPT was the last low-level peripheral on PC accessible to the OS, and is still used by EMCLinuxCNC RT kernel. Still, for something small and relatively cheap, the Sherline is well-regarded, and with this little dongle you can actually use it with a modern computer. The Othermill is great, and Inventables X-Carve and Carvey are more than up for the task. This application génerates the step puIses, but thé timing is maintainéd by the dongIe no real-timé kernel needed. Its fast át least as fást as the paraIlel port in thé ancient laptops wé have sitting aróund and pIugs right into thé CNC controller bóx for the SherIine. With a baré minimum of párts, this chip convérts USB into á parallel port fór real-time controI. The core óf this buiId is thé rt-stepper dongIe based around thé PIC18F2455 microcontroller.
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