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Power Mac G3 ROM
From Misc Data Digs
While there is a JFIF file in the ROM at 2E6E80, it doesn't seem like it could be accessible without either opening up the Open Firmware prompt or hacking. It's unknown if there is still a way to make this image appear. Given that this ROM was one of the last Old World ROMs, it's likely the last of such photos hidden in Apple's ROMs.
Developer Credit Strings
Also present in the ROM are quite a few developer credits:
STM Version 2.2, Aaron Ludtke CTE Version 2.1
v2.1 Rules! Long Live M. Appleman, S. Williams, A. Ludtke
Software by Casey King, Hardware by James Lundblad and Mohammed Sriti
Sony. MFM Floppy Driver. (C) Jul-1997 Apple. By: Ben Koning. S Thanks: Buczek, Christensen, Parsons, Polic, Sheet, Wilkinson, Cronce, Eisenberg.
InterfaceLib - May 23, 1993.(Copyright Apple Computer, Inc. 1984-1993. Eric Traut & Sean Parent
680x0 Emulation written by Gary Davidian
Dynamic Recompilation by Eric Traut, tuned by Bob Abeles
Serial Test Menu
Hidden in the ROM at 307CE8 is this serial test menu, but there's no confirmed way to access it:
Serial Test Manager T) Execute a test, single test number follows command T0) Run ROM Checksum Test T1) Run Address Line Test T2) Run Data Line Test T3) Run Simple RAM Test T4) Run Mod3 Forward Test T5) Run Mod3 Reverse Test T6) Run NVRAM Test T8) Run AddrPattern Test T9) Run NTAWord Test A) Execute all ROM-based tests Q) Quick test X) Exit STM (Continue booting) ?) Print this menu