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Re: 386DX40 build

Posted on 2011-01-21, 09:14

That overclockers website looks interesting! :happy: BTW, I've found out something interesting and important about oscillators. They don't all appear to be the same quality, and consequently, the overclocking ability is affected by this factor. Let me explain. I bought 5 100MHz oscis from a website …

Re: 386DX40 build

Posted on 2011-01-20, 22:14

Re: Siig controller. I'll take a pic and identify it first thing in the morning. Actually, I got it from the Netherlands! From our good friend Salient. It was in his signature list of goodies for sale. I removed the 60ns and 70ns SIMMs from the board, and installed 4 lots of 4MB 70ns SIMMs. Win95 …

Re: 386DX40 build

Posted on 2011-01-20, 21:21

Gasp! You've just made me rethink something. I looked at the mobo manual again, and it says the following, for my current jumper configuration: CLK2/4. Underneath, it says "CLK2 equals the OSC speed of the mother board". That means 100/4 = 25MHz! The bus speed is running at 25MHz! I thought it was …

Re: 386DX40 build

Posted on 2011-01-20, 16:57

Thanks very much udam_u! :happy: I have made a repair to the broken item. Hehe, I used a staple! I haven't tested it yet, because it's in a Contaq 386 mobo without a CPU - I'm waiting for a new CPU to arrive. If it works, that's great. If it doesn't work, because of my repair, I'll kindly ask you to …

Re: 386DX40 build

Posted on 2011-01-20, 16:10

I've got windows 95 installed, but I can't take any screen shots of the resources, etc. I've tried Everest Home and Ultimate, and also SiSoft Sandra 2001 and 2002. Everest throws up errors, while Sandra complains of missing .DLLs. Is there another win95 compatible utility I can use, to do some …

Re: 386DX40 build

Posted on 2011-01-20, 14:30

I decided to format my 2GB CF device. The one with Win98 on it. I am in the process of installing Windows 95 on it. I wanted to do Win98, but the minimum requirements are probably a 486. When Win95 is installed, I will post back with some comments. All of this is using the 386 mobo with a Siig IO …

Re: 386DX40 build

Posted on 2011-01-20, 12:48

OK, this is interesting. I go to the BIOS set up area, and enter "not installed" for the C: hard drive. I then reboot the machine. The BIOS POST display area tells me that the Siig Multi I/O controller card has found the 128MB compact Flash HDD OK, and DOS boots up as normal. I then remove that CF …

Re: 386DX40 build

Posted on 2011-01-20, 07:47

Maybe you should try some 12ns cache chips? JDRmicro had them, but they weren't cheap. Unfortunately, I think that JDRmicro has sold out of 12ns cache chips. I must admit that cache chips is not an item I look for, when hunting for retro hardware. Perhaps I should look a bit harder for them. If …

Re: 386DX40 build

Posted on 2011-01-19, 21:19

I've finished testing, using 128Kb of 15ns cache. I can't get the mobo to work any faster. It's the same story as before. The BIOS field called "Auto configuration function" must be set to Disabled, otherwise DOS won't boot up. In the process of testing, I accidentally broke this thing. It's like a …

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