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Date: | Thu, 5 Feb 1998 10:38:41 -0800 |
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On 3 Feb 98 at 19:32, Tom Kelly wrote:
> Regarding this subject, I want to know the same info on my Micron
> Millenia(12/95)133.
>
> It has a Micronics M54Hi motherboard.(MB754-70057)(09-00236-36-REV
> B2) Phoenix Bios 4.04, M-M54Hi-9PM(This is the bios with the HD
> cylinder head calculation glitch in it. Can't recoginze drives in
> the 3.276G to 4.0?G range)
>
> The chipset, 82430FX consists ot the 82437FX System
> Controller(66mhz), Two 82438FX Data Paths, and the 82371FB PCI ISA
> IDE Xcelerator(PIIX)(33mhz???)
>
> From what I have been able to learn the 82437FX supports 128M of
> main memory.
> Why would the 82437FX be rated at 66mhz and the 82371FB rated at
> 33mhz?
The system controller has to run at motherboard speed: 50, 60 or 66
MHz. [Some motherboards will also do 75 and 83 MHz.] The PCI
"Xcelerator" only needs to run at PCI speeds, which were only ever 33
MHz when the 430FX chipset was current. [There is now a 66 MHz PCI
spec; your chipset can't handle it.]
> The MB has a 12ns 256k SRAM.(L2 cache?)
Right.
> Also two MT58LC32K36D7LG chips. The best I can discover is that
> each is a 7.5ns 1Megabit Syncronous SRAM. What do these do?
Hmmm. I make these out as 32Kx36 bits; i.e., 128KB with parity.
Two of those sounds like 256K of L2 cache. But I presume your 12ns
rating above comes from some other components. Is one of these a
COAST (Cache On A STick) module? I know some VX boards came with
256K cache on board, but inserting a COAST module (256K or 512K)
would disable the onboard cache. Not familiar enough with FX....
> So what will happen to the operation of my computer when I go
> from 24Meg of main memory to 80Meg?
You have probably seen lots of messages about how the VX and TX
chipsets don't cache above 64MB. Well, I believe the equivalent
limit on the FX is 32MB.
> Also, I thought this chipset would support busmastering, but in
> Settings/Control Panel/System/Hard Disk Controllers/Intel PIIX PCI
> IDE Controller...Bus Mastering Not Supported?????
I believe Intel's bus-mastering drivers support PIIX2, PIIX3 and
PIIX4. Yours may be the original PIIX. You might see if you have
better luck with bus-mastering drivers from "Triones".
David G
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