PeterHaas

The DC7700 and DC7800 certainly have their issues, but the DC7900 is reasonably clean, except for LAN and audio.

My DC7900 CMT runs Mountain Lion flawlessly using the Intel kext for LAN and an nVidia 8400GS for video and Voodoo for audio.

One of mine was originally a DC7800 but was converted to a DC7900 by a mobo swap ($40, delivered, on eBay, using B-I-N). An E6850 proc.

The other DC7900 CMT was built for (presumably) Microsoft, but was surplussed by them as brand-new, but unused systems. An E8400 proc.

The brand-new DC7900 CMT was my main system for nearly a year.

Alas, the LAN is sort of non-standard. The Audio definitely is non-standard.

My subsequent systems have been 7-Series, with the proviso that the LAN HAS to be R8111, and the codec HAS to be ALC892 or ALC897. My own custom DSDT to allow any type of USB device to be inserted in any USB receptacle, adapted from Mieze's code.

Too many Hacks, too little time.

DSDT Editor provides additional, and very much needed, functionality over DSDTSE (Simple Editor), although I generally continue to use DSDTSE in preference to DSDT Editor.

DSDTSE will not, or cannot, detect instances where an assignment is being made from a wide variable or value (e.g., 64 or 32 or 16 bits) to a less wide variable (e.g., 32 or 16 bits or 8 bits). DSDT Editor can, and does.

My strong preference is to use DSDTSE for all or almost all development, until I get a clean and working DSDT, and then pass it, or rather "wash it", through DSDT Editor to catch any lingering errors, such as the assignment statement errors.

But, DSDT Editor can also catch and eliminate other errors, through use of the "Fix Errors" option of the error dialog of the compile option.

Both tools are useful to me, and I have come to depend upon DSDTSE for its rather simple interface, and also on DSDT Editor for its superior error detection and its optional correction.

This is especially helpful in a very complicated DSDT modification, such as porting Mieze's USB 1.1/2.0/3.0 compatibility mods from her MSI B75MA-P45 implementation (four slot) to another MSI or, especially, a non-MSI motherboard.

Using both DSDTSE and DSDT Editor, I have successfully ported her mods to MSI B75A-G43 (seven slot) and ASRock H77M (four slot) motherboards.

macphreak4evr, on 21 August 2009 - 04:44 PM, said:

We did over on Hackintosh Questions-Answers ... both the DC7800 AND the DC7900.

I got my DC7800 SFF and later my DC7900 CMT up and running on Mountain Lion withing 30 minutes of the availability of the download from the Apple Store.

You MUST be on the highest BIOS release from hp/Compaq for the USB flash drive boot method to work properly.

For Audio, I used Voodoo 0.2.1.

There is LOTS of work required on hp/Compaq's DSDTs for perfect OSx86 compatibility.