I'm not quite old enough to have needed to use this while writing my own software. But I've come back to it repeatedly while learning enough about the operation of DOS PCs to try my hand at reverse-engineering some games. That was at least 10 years ago. (It became clear that I'd bitten off more than I could chew, so no full game RE, but I documented a couple more file formats, wrote some file viewers, and learned a lot).

Before there was PC Interrupts, there was the The Prgrammer's PC Sourcebook and similar available at specialized bookstores like Computer Literacy Bookshops. Regular bookstores would generally contain a few computer and programming titles, but they weren't necessarily the best references.

When I came upon this list, and I don't remember how, I went from the The 97 Pound Weakling to a perfectly developed hacker. Seriously, it was a game changer and launched me into a game of catchup on the PC (I was a Apple II and C64 guy). I had so much fun at work with hacks but also making cool utilities.

I remember the first time I found this list and playing around with it using Microsoft QuickBASIC. I couldn't believe how much more functionality it opened up to me. Mouse support. Graphics support. Fun memories!

Was my bible at some point. Thanks for memories

Are there any interviews with Ralph Brown around?

It doesn't help that he's not the only RB.

how much of this info has been subsumed by standardized uefi?