Found in 2 comments on Hacker News
ethbr0 · 2022-09-16 · Original thread
People miss the trees for the forest when complaining about Hackers.

rzzzt · 2018-06-18 · Original thread
One more from Mr. Norton:

It covers a wide range of interrupt routines, both DOS and the BIOS ones. Also, some PCJr sound chip programming got snuck in.

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