I think you are thinking of overclocking the 750fx, any version of Reggie should be able to rw the L2CCR.
Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
PowerSurging to Mac OS X 10.5.8: Power Macintosh 9600 fun
- Thread starter LightBulbFun
- Start date
- Sort by reaction score
So here's a snapshot of what I see after I installed the Sonnet cache enabler. When you install it, it requires a reboot. So I rebooted and the first thing I saw on top of screen was something about Sonnet, then screen paginated rapidly to this point you see here and then it stopped.
![20210210_054224[1].jpg](https://forums.macrumors.com/attachments/20210210_054224-1-jpg.1727994/ "20210210_054224[1].jpg")
Then after I removed the Sonnet kext (per their direction if the above happened), I had to do a hard shutdown, rebooted to OS 9.1, started xpostfacto and then got to this point:
![20210210_055409[1].jpg](https://forums.macrumors.com/attachments/20210210_055409-1-jpg.1727998/ "20210210_055409[1].jpg")
I then had to hard shutdown and boot back into OS 9.1 and finally booted back into 10.4.11 successfully.
Aside from trying the powerlogix app, which apparently can't be found anywhere, I guess I need to go the CHUD route? I know absolutely nothing about CHUD.
Then after I removed the Sonnet kext (per their direction if the above happened), I had to do a hard shutdown, rebooted to OS 9.1, started xpostfacto and then got to this point:
I then had to hard shutdown and boot back into OS 9.1 and finally booted back into 10.4.11 successfully.
Aside from trying the powerlogix app, which apparently can't be found anywhere, I guess I need to go the CHUD route? I know absolutely nothing about CHUD.
What CPU do you have?
I'll walk you through CHUD and the L2CR register, once we know what values enable the L2 Cache.
Yes, we need to know the exact CPU.
ReggieSE may tell you, you can check the PVR, or likely someone here already knows the PVR Sonnet used.
CHUD, for brevity, I hosted the last versions we can still get on Google Drive....
chud4.6.2.dmg
drive.google.com
No need for all that, just install CHUD and launch ReggieSE and read the PVR register.
I.E. click the button that says PVR on the CPU tab.
Yes, that looks to be the PPC 750L, so I think the MPC750 data sheet applies here.
Also, if you could grab the L2CacheConfig file under OS 9 and upload it, or just give the text of the file.
Code:
0xB900004EOpen the L2CR in Reggie and paste that value, then hit Apply, and Refresh if it doesn't lock the system down.
Likely normal, the MPC750 says bits 19-30 are reserved, so they must have been used on the MPC750L, I just have't found the correct data sheet for that.
Also the other bits are shared, or one would hope, but you should't be at any real risk asserting these bits, assuming your data is backed up, sometimes a hard lockup can cause data loss, but that rarely happens with JHFS+.
hmmm.......
Maybe a bit we need to tick somewhere else too, I'll check the L2CacheContol source code and see if I can figure where we went wrong, you can also just try and set the lower bits 0xB9000000 and see what that does.
as I mentioned you need an older version of CHUD tools to do edit the L2Cache registers 
(make sure you use the CHUD Remover that came with your current version of CHUD before you install this older version)
(make sure you use the CHUD Remover that came with your current version of CHUD before you install this older version)