From: [EMAIL PROTECTED]
Date: Sat, 29 Oct 2005 09:41:47 EDT
Were there ever any problems with compatibility among daughtercards
for >> Mach 5 motherboards?
For instance, the speculative processing fix is in the ROM of the Mach 5
machines, but it is not in any pre-Mach 5 machine, and the third-party
cards have to patch the ROM in order to handle speculative processing.
(I don't think the 7300 motherboard had this fix, even though the 7300
motherboard used the 8600/9600 powering scheme, and you can install a
7300 motherboard in an 8600/9600 case).
Correct. The 7300 has the original 8600/9600 ROM, not the
Kansas/Mach V ROM. Only the Kansas ROM corrects the Speculative
Processing issue. The Kansas ROM will work properly in all earlier
machines including the Catalyst based machines, if you can find a way
to install it in them.
ROM versions (ROM Revision in ASP) by machine:
$77D.28F1 -- about 1/2 of 7200s(?)
$77D.28F2 -- about 1/2 of 7200s (?), 7500, 8500, 9500, All Power
Computing except PowerBase, S900, J700, Genesis, 7600
$77D.34F2 -- original 8600, original 9600, 7300
$77D.34F5 -- 8600 Enhanced, 9600 Enhanced; AKA Kansas machines.
The ROMs are physically four 1.1" X .5" chips with 22 pins down each
long edge for 44 pins total. They are pin compatible with AT49F8192,
AM29F800 and HY29F800 Flash memory in the appropriate package
(PSOP44, or SOC44), although the Reset and WE pins on the Flash must
be tied to 5V to use them as ROM substitutes.
The labeling on the ROM chips is as follows:
$77D.28F1 -- 341S0106 through 341S0109 (found in 7200 only, I think)
$77D.28F2 -- 341S0168 through 341S0171
$77D.34F2 -- 341S0280 through 341S0283
$77D.34F5 -- 341S0380 through 341S0383
So one way to distinguish an original 8600 or 9600 board from a
Kansas 8600 or 9600 board is to look at the numbering on the ROM
chips. Of course, if it's installed in a bootable machine, just look
at the ROM revision ($77D.xxxx) in Apple System Profiler.
One way to get the Kansas ROMs into an older machine is to get a
Power Computing ROM DIMM from any machine except the PTP, PowerWave
or PowerBase, remove the existing chips (341S0168 through 341S0171)
and solder in a set of Kansas chips (341S0380 through 341S0383).
Then find the 1K ohm resistor that ties pin 116 to ground and remove
that resistor. Then connect the resistor pad on the Pin 116 side to
5V (IOW, tie pin 116 to 5V). Pin 23 of any of the ROM chips is 5V.
Then the ROM DIMM can be installed in any x200/x500/x600 machine with
a ROM slot and it will disable the motherboard ROM, while installed,
and substitute its ROM.
The pin 116 modification is necessary in order to disable the
motherboard ROM. A Power Computing ROM DIMM in stock condition will
not disable the motherboard ROM and you'll end up with contention
between the motherboard ROM and the DIMM based ROM.
The ROM DIMM has the same form factor as a Beige G3 ROM but don't
plug it into a Beige motherboard! The Beige ROM runs on 3.3V and
the X200/X500/X600 ROM runs on 5V.
Jeff Walther
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