• Hello, Guest! Welcome back, and be sure to check out this post for more info about the recent service interruption and migration.

Power Mac 9600 - 350Mhz CPU Card Issues

KGLlewellyn

Active member
Hey all,

I've recently picked up a Power Mac 9600/350, unfortunately its CPU card is unwell. I know the machine is good as it works fine with the Sonnet G3 233Mhz card I picked out of my 7600. However, when the 350Mhz 604 card is installed, it'll just chime and the monitor will stay dark. It's labelled as the Macintosh High Performance Processor Card 100, with the resistor on the 350Mhz solder points.

Has anyone been able to repair one of these, or do you think it's perma-toast?
 

macuserman

Well-known member
Have you tried wiggling the card side to side and checking to see if reseting the pram after that gets it to boot? I've found that the cards have different thicknesses sometimes they don't want to play nice after you swap them around like that.
 

KGLlewellyn

Active member
Yup, I've tried that. No go sadly, also used some deoxit on the contacts and the slot.

One thing of note the first time using it, the startup chime sounded pretty garbled with static, but thereafter it sounded fine, but still nothing on the screen. I hooked up a serial cable to see if it was dropping into OF, but it appears that it isn't. I've ordered a 300Mhz card which appears identical to the 350Mhz one, and I'm going to see if I can use it to help troubleshoot the 350Mhz one.

Ofc if someone has info on modifying the 300Mhz one for 350Mhz then that'd be uber helpful. As far as I know, putting the resistor on the 350Mhz solder points isn't sufficient, that only impacts how the card reports to OF and the OS. Thanks!
 

Powerbase

Active member
I take it youve confirmed it's a Mach V motherboard and not an older one someone swapped in.

Im not sure what the older boards did when you tried to run a Mach V card in them.
 

KGLlewellyn

Active member
The machine is badged as a 9600/350 and the card is branded as a Mach V and the computer identifies itself as a 9600 with a G3 card in it. I'm not at home right now to double check the board. I'll report back on that.

I will say, it may be an early 9600 board as it doesn't have soldered ROMs on the board and instead has a ROMsimm installed.

Actually here's a bit of the board from the original eBay listing, not sure if you can determine it's a Mach V from that? Part No is ..20-0939-03 guessing by the pic?

Seems to be this one https://commons.wikimedia.org/wiki/...sh_9600_logic_board_820-0865-A_(661-1221).jpg (Board Copyright Date 1997)

The other variant appears to have a 1996 copyright date and has the square IC's on. https://commons.wikimedia.org/wiki/...20-0865-A_Power_Mac_9600_Motherboard-0928.jpg (I presume this is the non-Mach V board?)
 

Attachments

  • s-l1600.jpg
    s-l1600.jpg
    319.2 KB · Views: 8
Last edited:

Franklinstein

Well-known member
The 9600/350 was indeed factory-equipped with the 604ev Mach 5 (unless yours has had a logic board swap at some point). It was the early run <300MHz ones that may not play nice with a Mach 5 card because they weren't qualified to run it. I'm not entirely sure what differences exist between the logic boards but there must be something, at the very least possibly a higher-wattage power supply, to support the faster CPU and its high-speed inline cache.

The 9600 is also getting a bit old so it could be something capacitor-related such as not giving the 604 card as much power as it wants, causing the instability. The G3 cards use markedly less power than the 604 cards so something that may be marginal running a 604 may be fine with a G3 card.
 

jeremywork

Well-known member
The machine is badged as a 9600/350 and the card is branded as a Mach V and the computer identifies itself as a 9600 with a G3 card in it. I'm not at home right now to double check the board. I'll report back on that.

I will say, it may be an early 9600 board as it doesn't have soldered ROMs on the board and instead has a ROMsimm installed.

Actually here's a bit of the board from the original eBay listing, not sure if you can determine it's a Mach V from that? Part No is ..20-0939-03 guessing by the pic?

Seems to be this one https://commons.wikimedia.org/wiki/...sh_9600_logic_board_820-0865-A_(661-1221).jpg (Board Copyright Date 1997)

The other variant appears to have a 1996 copyright date and has the square IC's on. https://commons.wikimedia.org/wiki/...20-0865-A_Power_Mac_9600_Motherboard-0928.jpg (I presume this is the non-Mach V board?)
The board in the auction photo is a Kansas board, correct for a Mach V CPU. The four plus two unpopulated sets of pads oriented vertically are for motherboard cache, only populated on 604e Tsunami boards. The four horizontally oriented sets of pads are indeed for ROMs. There are some comparison pictures on the page below.

 

KGLlewellyn

Active member
The board in the auction photo is a Kansas board, correct for a Mach V CPU. The four plus two unpopulated sets of pads oriented vertically are for motherboard cache, only populated on 604e Tsunami boards. The four horizontally oriented sets of pads are indeed for ROMs. There are some comparison pictures on the page below.

Sweet, thanks for confirming that! At least we know the CPU card is compatible. :) And thanks for the link, that guide was a very interesting read.
 
Last edited:
Top