Get you soundcard from https://dirtypcbs.com/store/designer/details/7953/6510/wm9701-zip
or recreate it yourself https://github.com/CodeAsm/AlphaSound/blob/main/Documents/WM9707AMR.pdf (No no completed KiCad/eagle files from me, only the pdf)
Please, if you do, like N64Freak, share your KiCad/Eagle files or atleas the gerber files. I planned to do so, but N64Freak was ahead of me, and started selling his. And then offered the top option with dirtypcb (and not sharing the gerber files and he doesnt really like the scene anymore. which I understand)
If you like to know more, or need help diagnosing yours join the Xbox discords im probably in (and way more knowledgeable people are there) or check https://xboxdevwiki.net/Development_Kits#Franken_Alpha (ive tried making mistakes and documenting how to fix.)
A PC with a serialport to WinDebug the Xbox alpha would really help you diagnosing your franken alpha.
You dont need the audio card for the main dashboard to boot. Games, they may, need the audio card.
The USB card isnt needed to boot the recovery iso, but you cannot press any controller buttons. but handy if you have only the Mobo, ram, cpu and videocard.
The BOM for the audio card is this I think, (the bracket isnt really needed):
7 0.1uF 1608 C15, C27, C32, C40, C43, C45, C50
1 0.33uF 1608 C51
2 2.2uF 1608 C28, C35
5 10uF 1608 C6, C38, C49, C52, C53
2 22pF 1608 C33, C34
2 220pF 1608 C30, C37
1 0R 2012 L2
2 49R9 1608 R32, R57
2 220R 1608 R33, R36
2 47K 1608 R34, R37
1 10K 1608 R45
1 WM9703 TQFP U1
1 MC78L05ACD U3
1 NC7SZ66 SOT23-5 U4
1 24.576MHz X1
1 3.5mm Jack J9
1 3 pin header J15
1608 is Imperial,
or 0805 Metric.
I would hope you donate money to Borman18, from PtoPOnline and the museum he now works https://www.museumofplay.org/blog/author/andrew-borman/
Why? well, he gotten some of these prototype games, and after a donation run (I donated too) he shared them. And made wonderfull handy pictures for us to deduce what to do or how to make these franken alphas to work. I would especially love it, when you find some donation fundraiser for a prototype game to be released and chim in. cause thats what I do aswell, and its how I got my recovery disk for my franken alpha. lets release these babies and also maybe help former devs get some money for their old work (some of them sell their old stuff).
I know, long text. Thanks linus for the awesome video. altho I kinda disagree on the powerfullness of the PC, remember the date it got made? AAnyway, great video, and YES, for sure MS learned tons about security, DRM and hackers thanks to this early xbox. Remmeber folks, anything on the OG xbox runs in Ring0, 1 exploit, no jail to escape, your already root XD
Grab this free XBox hacking book by Bunnie Huang, THE early xbox hacker https://nostarch.com/xboxfree
Ok im done infodumping for now. have a wonderful day.