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Startup chime volume is stored in PRAM. You may have cleared PRAM when removing the battery. You can mute the startup chime by holding the mute key while turning on the system

It seems like there isn't much information in one place on how the graphics on Classic MacOS work (relatively to modern graphics APIs like Vulkan etc). I'd like to document this further, hopefully to fix graphics acceleration for newer processor/OS or to implement your own graphics interface...

There's on-board RAM. The bus is going to be the bottle neck

Latest GCC has more proper support for language features and has more optimizations. Also, it has a higher possibility to be automated with Continuous Integration compared to older toolchains.

Looks like only emulation of fastram, IDE, mmu, fpu, and CPU. Rest is real hardware. I think the idea of PiStorm is nice, as you could have similar possibilities as RaSCSI but with more bandwidth. It looks like A314 (trapdoor expansion for Raspberry Pi) services can be integrated on the PiStorm.

On Pi4, USB is implemented over PCIe. On CM4, the PCIe bus is exposed, allowing you to add USB or another interface. (PCIe<->PCI<->NuBus?)

Most likely. The eMMC would take up the place of the SD connection.

You can also use an eMMC to microSD adapter for your Raspberry Pi. eMMC are more reliable than microSD

A/UX requires ROM patches in order to work. They are specific to the ROMs installed in the machine. If you want to fix this, you would need to re-implement A/UX Startup so that it will load the correct ROM from the disk, then apply the patches.

Binutils does not require any patches. The version used is 2.10.1. The last version of Binutils to support m68k-coff format is 2.16.1. GCC requires patches. I ported the patch to 2.7.2.3 in unified format.  Retro68 exists, but it creates applications for the Macintosh environment, not the...

If I remember correctly, GCC is pre-installed on this image: https://github.com/unxmaal/aux_sdcard Be aware that it is an older GCC based on the 2.7 series. I planned to port GCC 10 but other things took my time. You cannot use the GCC patch as-is when cross-compiling, since it requires the...

I think it would be possible for terminator power. However, as mentioned before, the Raspberry Pi needs to be up first before the Mac. Powering the Raspberry Pi using the terminator power would be possible if the Mac has a lot of RAM, and thus takes a while doing the RAM check, giving time for...

A SCSI Manager API shim on the Pi side would be nice so you don't have to learn 2 different APIs… https://developer.apple.com/library/archive/documentation/mac/pdf/Devices/SCSI_Manager.pdf // Constants enum { /* TIB instruction opcodes */ scInc = 1, /* transfer data, increment buffer...

The Unarchiver already exists. For something written in C, this project was made to extract System 6 disk images, based on The Unarchiver sources: https://www.gryphel.com/c/minivmac/extras/ua608d/index.html

https://github.com/autc04/Retro68#apple-universal-interfaces-vs-multiversal-interfaces

Retro68 has assembler and C compiler targeting classic Mac OS.

For the ethernet driver, someone developed some hardware that can be used with existing driver:  I wonder how portable it is to RaSCSI… I haven't taken a look at the sources

Some patches for Linux ADB driver have been posted. https://lkml.org/lkml/2020/6/28/8

What happens when you put A/UX Startup back in Startup Items

It is because /opt is on a different partition on a different virtual drive configured on scsi2sd utility