USB 2.0 conflict

Pcchips / M755
March 21, 2010 at 20:03:07
Specs: Microsoft Windows XP Professional, 801 MHz / 239 MB
Good morning. I bought a SkyMedia PCI card USB 2.0 4p (four doors) to install on my pc whose motherboard is a PCCHIPS 755L whose operating system is WIN XP 2. By placing the card into the slot of the motherboard and only showed me three lines in the following description: "SIS 630 AGP True Color and Video Accelerator GRAFCO 2M Bytes Video Memory, BIOS Version .51 Support Test Vesa BIOS Extension Ver 3.0. I went to the BIOS setup to disabled the usb card, nothing happened only the same answer on the screen. I changed the IRQ from 7 to 5. The same thing happened. I disabled the VGA to free IRQ, the computer started very slowly but I did reset several times and stopped on WELCOME in the windows, I did it again and the system stops when appeared the desktop icons, actually do not even remember how many more tests I did. I gave up. It is important to say that the bios only reads 400mhz, to increase the clock to 800mhz I always connect to the PC, go to setup and change the clock. Already changed the battery, still the BIOS does not fix what I put, even when I changed to try to make mother board recognize the usb 2.0. Please someone has a solution without mentions that I have to buy another pc or return the USB 2.0. I bought the web far from my state.
Thanks
Greetings from Brazil

lalama


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#1
March 21, 2010 at 21:20:26
Return BIOS to factory defaults, go back into windows and install the drivers for the USB 2.0 card you purchased either from CD media that was supplied with it, or from manufacturer's web site.The card should be recognized in your bios, but will not work in windows until you install the software for it. ALSO know that you should NOT use USB keyboard or USB mouse on this card, or it will not be available during boot up, they need to be directly on the motherboard USB ports (or stay with PS2 ports).

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#2
March 21, 2010 at 21:27:47
This motherboard can be connected to either an AT or an ATX power supply (20 pin connector, one piece, two rows).
If it's connected to an ATX power supply....
You MUST unplug the AC power cord to the computer, or otherwise switch off the AC power to the computer, whenever you're unplugging or plugging in anything to the mboard or to the power supply inside the computer case .
Did you do that ?

Did you by any chance install the SkyMedia PCI USB card in the last PCI slot closest to the center of the motherboard ??
If you did, move it to another PCI slot !

DO NOT install ANY PCI card in the the last PCI slot closest to the center of the motherboard, unless it is a PCI video card !
That slot is forced to share it's IRQ with the video on the motherboard , and if the PCI card in that slot is NOT a PCI video card, that usually causes problems!

"I went to the BIOS setup to disabled the usb card,..."

Doing that only disables the USB ports built into the motherboard. It will not disable the SkyMedia PCI USB card .
The USB that's built into the mboard IS NOT A CARD ! A CARD is removable and plugs into a slot on the motherboard inside the computer case.

If you have the SkyMedia PCI USB card in the last PCI slot closest to the center of the motherboard, move it to another PCI slot !

Then load Bios Defaults in the bios Setup, save settings, because you've probably messed up settings in that.

You did not need to change the bios battery, unless it's at least 5 years old !
........

PCChips Brazil (Portuguese) web site
Manual (English) for your motherboard:
http://www.pcchips.com.tw/PCCWebSit...

It's a *.doc file, not a *.pdf

You will need to read it in Microsoft Word, or in something that can read Word *.doc files. e.g. The Microsoft web site has a free Word reader available in the Microsoft Office support, or the freeware Open Office can read Word files.

755L

Your motherboard has headers for two USB ports, probably USB 1.1

Each memory slot can hold SDRAM, PC133 with a maximum of 256MB per slot

GFXcel chipset (Hsing Tech / PCChips specific labelling)
SiS 630 \ 730S

This mainboard has a Socket 370, which uses either an Intel PPGA/FCPGA Celeron or FCPGA Pentium III processor.

The following list notes the processors that are currently supported by this mainboard.

PPGA/FCPGA Celeron: 300~700 MHz, FSB: 66 MHz
FCPGA Pentium III "Coppermine": 500~1130MHz, FSB: 100MHz, 133MHz

"It is important to say that the bios only reads 400mhz, to increase the clock to 800mhz "

The cpu multiplier is automatically set according to the type of cpu detected by the bios.
The only way you could get 400mhz in the bios instead of 800mhz is if the fsb speed was half what it should be.
So - the fsb speed should be set to 133mhz in the bios, not 66mhz, if you have 133 mhz ram (and the ram should be set to 133mhz) .


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#3
March 27, 2010 at 05:49:22
Good morning.
I tried either suggestions gave by you two, however the response remains the same. I do not know exatly what's happening because the set up doesn't fix anything I change even the hour or it's clock. All the the time I turn on the pc I have to go into F1 up to CPU PnP Setup and set the clock to 800Mhz. Probably, I don't know, this is the cause of all the problem.
The web store whose I purchased the plate said it's ok for Pentium III, however PCCHIPS enterprise said the MB it's not compatible. (?)
Tks

lalama


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#4
March 27, 2010 at 08:16:41
This is a quote directly from the manual for your mboard that I provided the link to:

"The following list notes the processors that are currently supported by this mainboard.

PPGA/FCPGA Celeron: 300~700 MHz, FSB: 66 MHz
FCPGA Pentium III "Coppermine": 500~1130MHz, FSB: 100MHz, 133MHz "

After the manual was made, there may have been 800mhz Celerons available that the mboard's bios would recognize, especially if someone updated the bios version.

The multiplier of Intel cpus is often "locked" and usually can't be changed in the bios Setup on most mboards of the age of yours.
A 800mhz Celeron would have a multiplier of X12 -
12 X 66.66mhz = ~800mhz.
A 800mhz PIII would have a mutilpier of X8 - 8 X 100mhz = 800mhz
or - it would have a multiplier of X6 - 6 X 133.33mhz = ~800mhz

Since you're getting 400mhz and 800mhz depending on settings...

I suspect you have a PIII cpu with a multiplier of X6 - 6 X 133.33mhz = ~800mhz
- when the fsb speed and ram speed is set to 66mhz, it runs at 400mhz.
- when the fsb speed and ram speed is set to 133mhz, it runs at ~800mhz.

ALL of the ram installed must be PC133 in order for the cpu to run at 800mhz.

In order for your changes to "stick" ...

- you must SAVE the bios settings before you exit the bios Setup when you have made changes.

- the cmos battery must be detected by the bios as being okay - if it isn't, you will get a message "Cmos Checksum Error" or similar every time you boot the computer after the computer has been shut off, and when you go into the bios, the time and date are not correct - they've been set back to defaults. Since you say you have changed the cmos battery (I'm assuming was it a NEW battery), the only way that can happen is if the battery is installed backwards so the + is not showing on it when it has been installed, or one of the contacts in the socket is not touching the battery, or there is corrosion in the battery socket that needs to be cleaned up (or if it was NOT a new battery, the battery may be too weak or dead).
.......

"The web store whose I purchased the plate said it's ok for Pentium III, however PCCHIPS enterprise said the MB it's not compatible. (?)"

If you mean the SkyMedia PCI card, it will work, but you MUST NOT INSTALL IT (or any card except a PCI video card) IN THE PCI SLOT ON THE END CLOSEST TO THE MIDDLE OF THE MBOARD, and you must install install drivers for it !

If you have a PCI video card, it can use that slot !

If you mean a USB wiring adapter that plugs into the mboard USB header - it has one or two female connectors and wiring and a plate with two USB ports in it that installs at the end of lot space - the pattern for the wring of such an adapter and the uses for the pins on the mboard USB header was never standardized. Where the wires are on the female wiring connectors, what they are for, may not work with the what the pins are for on the USB header on the mboard.

Page 23 of the 755L manual I pointed to shows which pins are for what on the USB header.

Common wiring 5 in a row female connectors with 5 wires will NOT work with the USB header; 4 in row female connectorscannot work with the USB header. You would need to have an oddball wired 5 in a row female wiring connector, or wiring that has individual female connectors for VCC (+5v) and (power) ground, and individual female connectors for UV+ and UV - (data + and data -), although the ones for USB data could be in a two in row connector.



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#5
March 27, 2010 at 11:22:50
Quoting from the 755L manual I pointed you to....

"All processors are automatically configured using firmware and a synchronous/asynchronous Host/DRAM Clock Scheme.

The mainboard has two DIMM sockets for system memory modules. You must install at least one memory module in order to use the mainboard. You must install the first memory module in the DIMM1 socket to provide shared memory to the onboard VGA display circuitry."

My notes - DIMM1 is the one closer to the cpu .
You MUST have a ram module in DIMM1 if you're using the onboard video.

"For this mainboard, you must use 168-pin, 3.3V unbuffered SDRAM memory modules. If the installed CPU uses a 100 MHz system bus, you must use PC100/PC133 memory. If the installed CPU uses a 66 MHz system bus, you must use PC66/PC100 memory. You can install any size memory module from 16MB to 512MB, so the maximum memory size is 2 x 512MB = 1 GB.

The edge connectors on the memory modules have cut outs, which coincide with spacers in the DIMM sockets so that memory modules can only be installed in the correct orientation."

My note - Also.... If the installed CPU uses a 133 MHz system bus, you must use ALL PC133 memory.
.....

"BIOS Setup Utility"

"CPU PnP Setup Page"

"CPU Speed The item displays the internal clock speed of the CPU, based on the next two items.

CPU/SDRAM Frequency Use this item to sets the external clock frequency for the CPU and the memory bus frequency. The options include combinations of 66 and 100MHz. Set the CPU clock based on the requirements of the CPU installed on the board. Select the memory frequency based on the speed of the memory installed on the board.

CPU Multiple Freq. Use this item to set a multiplier for the CPU external frequency. The multiplier times the external CPU frequency sets the internal clock speed of the CPU, e.g. 100 MHz (external clock or "FSB") x 4.5 (muliplier) = 450 MHz (internal clock speed of the installed CPU)."

My notes...

If the 800mhz PIII cpu type uses a 8X multiplier, you MUST use 100mhz X 8, and ALL your ram must be PC100 or PC133.

If the 800mhz PIII cpu type uses a 6X multiplier, you MUST use 133mhz X 6, and ALL your ram must be PC133.

You MUST save the bios settings.

If you set that wrong, the next time you boot you will get a message "Wrong CPU Type - press F1 to change settings " or similar, because the bios has detected you're using the wrong cpu settings for the type of cpu you have installed - it's detecting the unchangable multiplier the cpu requires, and you don't have that set right..

"BIOS Setup Utility"

"Advanced Setup Page"

"System BIOS Cacheable If you enable this item, a segment of the system BIOS will be cached to main memory for faster execution."

My notes...

The default is that's Disabled.
Usually your mboard will boot a little faster if that's Enabled.
.........

If you don't have anything that can read newer Word files (*.doc files).

Word Viewer 2003
Download Size: ~12mb
wdviewer.exe

This is no longer available on the Microsoft web site, but if you search the web with: wdviewer.exe
some places on the web have it for you to download.

E.g.
http://ca.search.yahoo.com/search?p...

Note that some "hits" for wdviewer.exe actually download the latest one - make sure you're downloading wdviewer.exe (12.x mb) and NOT wordview_en-us.exe (24.5 mb).
.......

This is the only one available on the Microsoft web site, but it's a much larger download....

Word Viewer
wordview_en-us.exe
Download Size: 24.5 MB

Brief Description
View, print and copy Word documents, even if you don't have Word installed. This download is a replacement for Word Viewer 2003 and all previous Word Viewer versions.
Download Size: 24.5 MB
http://www.microsoft.com/downloads/...


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