- PS/2 keyboard and mouse interfaces. If you use these, they will tie up the second port on the duart.
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## Beware.
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## Duart
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### Beware.
I bought a Motorola MC68681 duart and discovered that it should have been an XR68681 duart. The Motorola part is an older design and can't run at the speeds that the newer chip can. I was able to get it to run, but at 38400 instead of 230400. When you're loading large programs via the serial interface, that makes a *huge* difference, so don't be like me, get the correct chip first time.
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## PI/T
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### Links
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- [Good Example](https://people.engr.tamu.edu/rgutier/web_courses/ceg453_s00/l2.pdf) of how to program the device and handle the interrupts in C.