On the old A4000 was the message, "Amiga showed the way, then Commodore came and f**ked it up!!"
The old Oric 48K. ahd the message, "Hi Helen".
The Sinclair ZX Spectrum +3 had a whole secret programme that produced a 96 colour palette stobing background with the message, "I'm a +3" in large print across the screen.
As an qualified electronics design engineer, it is kind of traditional to leave ASCII messages in ROMs even on embedded systems, etc. It is somethnig that the construction industry has been doing with pieces of wood, paper, etc. dropped into walls for centuries.
Well at least Amiga is in safe hands with Gateway and back in production if only for NASA and the millitary.