It is simple : Doug sent me the files needed to compile a program that will rebuild a valid ROM with the requested sound. It’s easier to have two, for a good reason: as we play with the boot ROM, the risks are to totally crash the machine. Good news for me, Doug used a Power Mac G3 B&W for his trials, and I just have two of these available. With “New World ROM” Macs, the ROM is to be modified with a software (it can be flashed like a BIOS) and changing the startup sound is possible. Doug had already changed the startup sound on an old Mac by directly modifying the ROM, but it requires a lot of equipment. I contacted him, he helped me a little, and I did it, too.īasically: the Mac startup sound is stored in a ROM (with Open Firmware on old items, the EFI on recent ones). But obviously, Doug Brown has not read the Internet or asked anyone : he just did it. When I searched on the Internet, I found messages indicating that it was impossible. When I asked if it was possible, I was told that was impossible. Changing the startup sound on a Power Mac.
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