How Wozniak’s code for the Apple 1 works

Ben Eater walks through the 6502 assembly code of Steve Wozniak's Apple 1 system monitor.

More 6502 stuff: eater.net/6502 Support these videos on Patreon: patreon.com/beneater or eater.net/support for other ways to support. 0:00 Variables 2:16 Hardware initialization 2:54 Reading input from the keyboard 10:18 Parsing the command 13:45 Parsing a hex value 21:29 Examine mode 28:28 Block examine mode 31:16 Store mode 34:28 Print routines ------------------ Social media: Website: eater.net Twitter: x.com/beneater Patreon: patreon.com/beneater Reddit: reddit.com/r/beneater Special thanks to these supporters for making this video possible: Adrien Friggeri, Aleksey Smolenchuk, An Dương, Anthony Weems, anula, Ben, Ben Cochran, Ben Williams, Bill Cooksey, Bill Watkins, Binh Tran, Богдан Федоров, Bradley Stach, Brian Haug, Burt Humburg, Carl Fooks, Carsten Schwender, Chai, Chaitanya Bhatt, Chris Anders, Chris Lajoie, Chris Sachs, criis, Cristi Cobzarenco, Daniel Pink, Daniel Tang, Daniel Zimmer, Dave Walter, David Clark, David Cox, David Dawkins, David House, David Klassen, David Sastre Medina, David Turner, Dean Bevan, Dean Winger, Deep Kalra, Dennis Henderson, Dennis Schubert, Dilip Gowda, Dirk Sperling, Dmitry Guyvoronsky, Dustin Campbell, Dzevad Trumic, Emilio Mendoza, Eric Dynowski, Erik Broeders, Erik Granlund, Ethan Sifferman, Eugene Bulkin, Evan Serrano, Evan Thayer, Eveli László, EvinSaysMarxWasRight!, Florian Bürgi, fxshlein, George Miroshnykov, ghostdunk, Gregory Burns, GusGold, Hailey, Hovis Biddle, Ingo Eble, Jacob Ford, James Beldock, James Capuder, Jared Dziedzic, Jason Bowen, Jason DeStefano, Jason Grim, Jason Thorpe, JavaXP, Jaxon Ketterman, jemmons, Jeremy Cole, Jesse Miller, Jim Kelly, Jim Knowler, Joe Beda, Joe Pregracke, Joe Rork, Joel, Joey Murphy, John Hamberger jn., John Henning, John Meade, Jon Dugan, Jonn Miller, Joseph Portaro, Justin Graziani, Kai Wells, Kefen, Ken Paul, Kennard Smith, Kenneth Christensen, Kyle Kellogg, Lambda GPU Workstations, László Bácsi, Lithou, Lukasz Pacholik, Marcos Fujisawa, Marcus Classon, Mariano Uvalle, Mark Day, Martin Noble, Mats Fredriksson, Matthew Clifford, melvin2001, Michael, Michael Cartwright, MICHAEL SLASS, Michael Tedder, Michael Timbrook, Michael Weitman, Miguel Ríos, mikebad, Miles Macchiaroli, Muqeet Mujahid, NacOJerk, Nate Welch, Nicholas Counts, Nicholas Moresco, Nick Chapman, Oli Homer, Olivier HUBER, Örn Arnarson, Paul Heller, Paul Pluzhnikov, Pete Dietl, Phil Dennis, Philip Hofstetter, ProgrammerDor, Ralph Irons, Randal Masutani, Randy True, raoulvp, real_huitz, ReJ aka Renaldas Zioma, Ric King, Richard Wagoner, Rick Hennigan, Rob Bruno, Robert Brown, Robert Diaz, Robert Keown, Robey Pointer, Roland Munsil, Sagnik Bhattacharya, Sam Sturgis, Scott Gorlick, Scott Holmes, Sean Bright, Sean Patrick O’Brien, Sergey Kruk, Shane Mulcahy, SonOfSofaman, sorek.uk, Spencer Ruport, Stefan Nesinger, Stephen Kovalcik, Stephen Riley, Steve Jones, TheWebMachine, Thomas Eriksen, Tim Oriol, Tim Sanders, Ti