30 Jun
2012
30 Jun
'12
6:49 p.m.
On Jun 30, 2012, at 18:36, "Chuck Guzis" <cclist at sydex.com> wrote:
Finding someone who knows where to dig up that data is a significant challenge. I'm
given to understand that the internal chips weren't always even all that well
documented; I have a document dump on the SWIM 2 and 3 chips that in places are little
more than scrawled notes. Al may have some insight.
- Dave
On 30 Jun 2012 at 16:37, Ryan Brooks wrote:
They do not. My recollection is that the early Power Macs were essentially a port of their
corresponding Quadra architectures (610, 650 and 800) to PowerPC, with relatively little
modification save a bus adaptor.
Can you get into open firmware as others have
suggested?
Well, you have me there. I didn't think that NuBus Macs had open
firmware. At any rate Cmd+option+O+F is completely ignored. But
if
there's Open Firmware on that machine, I'd appreciate knowing how to
get to it.
Out of luck in that respect, unfortunately.
And this is
different than a PC motherboard how? Let me
(reliably) reflow that BGA that I can buy where? Data sheet?
I can find datasheets for most PC chipsets of the 6100's vintage
(1994) and at least know what signals to look for. On the Apple, not
so much. I don't replace BGAs (but I know people who do) but I have
replaced QFPs without serious issues--and the ones on the 6100 aren't
particularly fine-pitch, so they should be a walk in the park to
change.
So where are the Apple datasheets on the 4 largish 124-pin QFPs on
the 6100? Surely, Apple can't be worried about IP on a nearly 20
year old design...