a screen from DOS DEBUG showing the value 'CC' coming from a register, as well as some flags showing new data available in the register.
https://files.mastodon.social/media_attachments/files/111/003/521/045/793/509/original/c6f35e84cb79c153.png
bidirectional registers now work! i can write a command from the PC to the Teensy, and i can write a response from the Teensy and read it from the PC. there are also status flags showing when new data is available. it may not seem like much, but this is huge progress.
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