hi guys, I have a S3 Virge DX card, a PT-75 from AOpen. I don't remember where I got it from years ago, I had never test it before, until some weeks back. After cleaning and visual inspection it appeared to be mostly fine. Just a slightly bent pin (but not making contact with another) on the main …

Excellent, thanks for the pictures! I'll take a look in my stash to see what parts I already have and what I need to buy. Well, I measured the clock signal on the ISA bus with a friend's oscilloscope. it delivered 7 point something Mhz (i forgot it), although with a certain "noise" (a small spike) …

TheMobRules wrote on 2023-07-30, 09:51: Now I'm tempted to add the 3V regulation components to my own board! I hope these pictures may help you to do that:

Dorunkāku wrote on 2023-07-30, 10:05: 4700 Ohm It is connected to the gate of the MOSFET. In the picture the LT1085CT does not have a heatsink, it really needs one! Yes, I removed the heatsink to take the photo, so the board could be seen better. in the photo of the complete board you can see it

No, that is not going to give you correct readings. The LT1805CT needs a minimum current to actually be able to regulate its output. Measure the voltage on the capacitor TC12 with a CPU installed. Also use a Award BIOS if you like to lift the board from sub-par performance to one of the best …

Yeah, considering that both the Intel and AMD DX4 variants support the VOLDET pin I don't understand why they would do it differently. I have another SiS471 board, the ASUS VL/I-486SV2GX4 which implements this feature in the following way: there is a jumper that allows you to connect the VOLDET pin …

Interesting... not sure why this motherboard handles the voltage differently for AMD CPUs, but who knows? Anyways, if you get the 5x86 working with the SV8B configuration the only thing remaining would be to set the 4x multiplier for 133MHz. At least on my version of the motherboard you can do that …

I measured Vcc for most of the 3.45v configs. off course no CPU in the socket Intel DX4 W/T: 5.1 v Intel DX4 W/B: 5.1 v AMD DX2: 3.53 v AMD DX4 V8T: 3.53 v AMD DX4-S SV8B: 3.53 v AMD DX4-S SV8T: 5.1v "Misc 5x86": 5.1v see? Anyway, I'll stay working with the configuration AMD DX4-S SV8B for the …

on the resistor to the left: 150 ohms on the resistor to the right: 10K I measured the voltage without the CPU in the socket. I will test every jumper config and tell you the voltage in each case I gave the regulator a close look. for the Intel dx4 on the ADJ leg of the voltage regulator there are …

TheMobRules wrote on 2023-07-27, 16:42: Thanks for the pictures! Give me some time while I go through the jumpers with my multimeter and I'll get back to you. you welcome. but, if you only have the 5v version, how can you measure the 3.45 settings? I asked because in your initial post you said you …

Do you have any idea why with the configuration for the intel dx4 it is giving 5 volts? Could you share the configuration of the jumpers you are using? Can you take close photos of the components around the CPU and regulator area, including the markings on the regulator chip? I have this board, but …

hi, friend. I know this is an old thread, but it's the only place I've found to ask. I have that same Acer/AOpen VI15G motherboard (actually, I have two), the revision with a voltage regulator and support for 3.3 volts. It is part of my two old PCs, stored about 20 years ago and that nostalgia has …

hi, friend. I know this is an old thread, but it's the only place I've found to ask. I have that same Acer/AOpen VI15G motherboard (actually, I have two), the revision with a voltage regulator and support for 3.3 volts. It is part of my two old PCs, stored about 16 years ago and that nostalgia has …

hi, friend. I know this is an old thread, but it's the only place I've found to ask. I have that same Acer/AOpen VI15G motherboard (actually, I have two), the revision with a voltage regulator and support for 3.3 volts. It is part of my two old PCs, stored about 16 years ago and that nostalgia has …

I've tried with 8MB SIMMs instead, and an ISA VGA card. Still nothing happens, and it doesn't complain about RAM when none is installed either. I already got my refund and the board is now in my parts box. :P Hi, I know it's an old thread. I have that same board. stored more than about 15 - 16 …