Information about AGP un-synchronizing of intel440BX
First, although he plans to experiment on himself in creating this homepage Since Windows NT is often used in order for me to do Dual Celeron to their being those by whom I myself seldom spend money on a computer or to use CD-R Since it did not examine with the newest AGP card, or it examined by OS which is not supporting AGP, and it does not understand that AGP carries out asynchronous operation in no environments but trouble was made to you, I apologize.
Although it was [ which it is written below ] asynchronous as an examination, and also it performed using TTL as synchronous 1 / 2 clock made into 3.3V system etc., it has not succeeded in it being asynchronous and operating all AGP boards by the present place reconstruction method.
In the present stage, it was hard that there was a carrying-out [ AGP / asynchronous operation ] thing, or in software, although the Execute mode in AGP operation is the cause although it is unknown, and met, I understand. For this reason, it turns out that there are a board which completely operates normally, a board (it is likely to carry out) on which it operates except Direct X, and a board which does not operate at all in Windows 95/98. (It is thought that the board which does not operate at all is carrying out transmission by Excute mode also to the usual picture display.) Although it is rough, a possibility of operating with an outdated board is high.
A possibility of operating with the board on which it operates except 3D normally to reference at the time of asynchronous operation if AGP Apperture Size is set to the minimum 4MB by BIOS is high.It is said that this is because Excute mode operation may become impossible when AGP Apperture Size is set to 4MB. There is RIVA TNT2 system as an example of this type of board.
completely -- it is unlikely to move -- things were G200/G400 and S3 Savege4pro.
i740 and S3 Savege3D operated in my environment. In addition, although not confirmed, since Windows NT does not use AGP, it should operate.
It seemed that finally, it would not be concerned with AGP Aperture Size, but would operate by VANTA if it is made the AGP functional non-effect on the adjustment screen of DirectX although examined DirectX7. (It is natural, if it should be set to early PCI and it says that it is natural) If the direction to carry out an asynchronous operation examination is tried, one of methods also makes it the AGP functional non-effect.
 
The AGP asynchronous reconstruction method of intel440BX
Cautions
Although the report of asynchronous reconstruction of PCI/AGP which is the contents of this page appeared in the magazine of Softbank publishing incorporated company of November 18, 1999 sale "DOS/V magazine CUSTOM", the number of No. 8 of the leg of the photograph which explains the number of the leg of the oscillator of the crystal of AGP reconstruction in the report of a magazine had become contrary to 4. Be careful of those who look at the photograph of a magazine and are converted to prevent mistakes.

- A possibility of it being asynchronous and not operating except old AGP board is high as the above-mentioned explanation.
- I am sorry that explanation is easy compared with PCI.
- It seems that an oscillator also has the thing of 3.3V although I used the thing of 5V.
- Seemingly, it will be better to have inserted the diode into the power supply in the case of the device of 5V, and to use it by 4.5V place.
- There is a page of a reason which attaches the diode with which Mr. ROBIN was written.
There must be tip resistance written to be 220 between the chip set on a main board and AGP slot, and it investigates. A red portion is cut off by the cutter.
It is O.K., if a capacitor is attached to an oscillator, GND is connected with 5V and a clock is injected into the portion of the above-mentioned arrow.
It is the reference circuit diagram which attached 74AS04 to the power supply at the case where a capacitor addition is carried out with a diode, and the output of an oscillator. Although a meaning is to carry out [ itself ] a buffer, there may be few effects. If a buffer is set to 74LCXs04 and the power supply of 74LCX04 is made reference 3.3V, an oscillator does not need to attach a diode to the power supply of an oscillator for 5V, either.