[dorkbotpdx-blabber] Designing a Parallel-to-USB Converter

[Paul Stoffregen]

> Strobe the data in with a pin change interrupt.

What is the minimum hold time spec?

Don't forget to consider the worst-case interrupt disable (which the C 
compiler makes rather difficult to estimate), because it really sucks to 
meet a hold time spec in the common case but latch too late when it 
occurs while interrupts are disabled.

Some things are best solved with real hardware.