To be honest, I do not really understand your question. What DA do you like to output? As you tell a soundcard is no option and later talk about macSD (are you talking about the CD-ROM drive emulator https://macsd.com/  ?) I am wondering if you just talk about DA from CDs? If so why no using you CD drives DA output? Or CD-DA transfer over SCSI with an SCSI drive?

Also I do not understand why a soundcard is no option for you? There are some good FireWire interfaces, even if they are technically also soundcards, just "external" means at the FireWire bus instead of PCI.

It has nothing to do with the display and everything to do with the hardware and driver.

SheepShaver's emulated graphics device supports all color depths and resolutions in Mac OS 9.0.4.

A program shouldn't depend on a color depth unless it's using its own drawing routines.

A game that's made for the original black and white Macs, on top of requiring a black and white mode, may also require a specific resolution (512x342) and even a specific framebuffer address.

I suppose you could make an emulated framebuffer in a newer Mac and copy that buffer to the real framebuffer at 60fps (or less if that takes too much processing power). Changing the framebuffer address is probably not possible (unless you can do something tricky with virtual memory?) - it may be easier to patch the program.

Overclocked my 867 module last night and it runs really well now. Was a bit hesitant at first but so easy to do. I had a non working 9250 ATI card I scavenged a 102 1k resistor from, did the swap and all is good!

While I had the heatsink off I removed the foil strip, masked off the contact area and set to it with 600 and 1200 automotive paper. The contact surface is now almost mirror smooth and even at 933mhz the heatsink stays very cool during use with the addition of a dot of Arctic 4 paste.

Well worth doing in the end.

I could quite happily just disconnect the speaker I just don’t like an unsolved issue.

Thank you.