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problems with bootdisk/cmos-setup/ram

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5 replies

by europanorama

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my board is asus txp4(socket 7)
i flashed the rom but had some troubles making the flash-steps.
1. system blocked when using setup-defaults(ok bootsequence had to be changed a,c-c,a is standard in setup-default-settings)
2. i tested my 4x16mb edo-ram 60ns, they are ok
but, when i set 60ns and make the boot(setting up new windows) at the end it says "access denied" although everything seems to work. all drives are accessibly. with other settings(70ns and default) everything is ok. BTW: i used the newest bios update with no improvements but currently i am using the second newest.

5 replies

by thechas

Hi Michael,

I have been thinking about your problem for a couple of hours.

First, did you have the BIOS settings to default when you flashed the BIOS?
If you were getting memory errors whith the settings you had when you flashed the BIOS, theflash could be bad.
You need to have no system errors when you flash the BIOS.

Second, did you reset the CMOS memory after flashing?
Often, the location used for a setting changes, and you need to re-set the CMOS memory to clear any extraneous settings.

Did you verify with the IC manufacture that made the RAM chips on the SIMMs, that the chips are indeed 60ns chips?

Finally, how do you know that the EDO RAM is good?
Did you use a RAM tester that verifies clock speed?
Or did you tryit in another motherboard?

On a Socket 7 motherboard, if you are not using a CPU that uses the 66MHz bus speed, you will not clock the RAM at it's maximum rate even if you set the RAM settings to fastest.

If memory serves me correctly, only 133MHz and 233MHz CPUs clock the bus at 66MHz. All other CPUs clock the bus slower. Most at only 50MHz (75, 100, 150, 200MHz).

If the test board has a 200MHz CPU, and the target board has a 133MHz, the target board actually clocks the memory at a higher rate than the test board.

The PCI bus is clocked at 1/2 CPU bus, and the RAM is 1/2 of that.
So, at 66MHz bus, the memory is clocked at 16.66MHz
At 50MHz bus, the memory is clocked at 12.5MHz (80ns).

Chas

by europanorama

its unbelievable what you know. chas, you are a mysterium(dont know if this is said in english).
i use a p200mmx(p55c). although i want to use only a mmx-processor, i will recheck your tips by testing p54c-processors with 60mhz bus speed.
btw: i had endless troubles testing standard pentium-board p54c-processors. i gave it up because i cannot sell them.
ram was tested with ctram51.exe, a tool from http://www.heise.de/ct
they had an intensieve report about ram-testing. after reading it you come to the conclusion that there are no good testing exquipment around(even the most expensive is not foolproof) and that there are a lot of difficulties all around this theme!i hope i will nob be able rating your answer. this system is so complicated.

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