Restoring Satoru Iwata's 1981 Easter Egg in Star Battle for the Commodore VIC-20

Before he was President of Nintendo, before HAL Laboratory, Satoru Iwata was a Commodore fan who programmed games on his Commodore PET 2001. When he started with HAL, he made a Galaxian clone called Star Battle for the VIC-20 which was released in 1981. In that cartridge he hid a credits screen which hasn't been fully revealed until now, 42 years later.

Big thanks to Darren from Groo Tube for help with the thumbnail:    / @grootube  
Also thanks to Jason Compton for wording suggestions!

Become a patron:   / 8bitshowandtell  
One-time donation: https://paypal.me/8BitShowAndTell

Links:
Ward Shrake's VIC-20 document where I probably first learned of the hidden text in Star Battle: http://www.zimmers.net/anonftp/pub/cb...
Gaming Historian's video about Satoru Iwata:    • The Life of Satoru Iwata  

Ending music is an unreleased instrumental version of "The NPC" by Bedford Level Experiment: https://bedfordlevelexperiment.bandca...

Index
0:00 A brief history of Satoru Iwata
1:58 Star Battle: Satoru Iwata's first commercial game
3:58 Using a RAM Expander and SuperMon to analyze the ROM
6:23 The easter egg text
9:24 Triggering the easter egg
10:22 How I found it: 1) The print routine
13:25 2) Finding the easter egg code
16:04 3) How to trigger it: keyscan routine
21:59 4) How to patch to restore key combo
24:05 How it was intended: the egg
25:44 Thanks to my patrons