VOGONS


First post, by jedikwon

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Hello. I have this 386 computer with AUSTIN COMPUTER SYSTEMS PREDATOR motherboard and AMD 40mhz cpu.

It's got headers to set CPU clocks as you can see in the picture.

The attachment 386_01.jpg is no longer available

I can set the clock from 20 to 40, making it equivalent to switching from a fast 286 to a fast 386, which makes the system very versatile.

But changing jumpers requires opening the case, and it's just too much hassle, so I came up with a simple solution.

The attachment 386_02.jpg is no longer available

I just ran some wires directly to the headers, allowing me to move the jumpers around to set the speed I want.

It works fine, but it looks rather ugly.

So my question is: Is there a way to convert those headers into something neater and easier to manipulate, like DIP switches or even push buttons?

Ideally, I want four buttons, each representing a clock speed of 20, 25, 33, or 40. With a single press, I can change the clock speed and then start the computer.

Or a set of DIP switches could work?

Please share your ideas. Thank you.

Reply 1 of 4, by debs3759

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If the headers have a common track, then a 4 way rotary switch will help prevent setting two jumpers at the same time, and would be a neat solution.

See my graphics card database at www.gpuzoo.com
Constantly being worked on. Feel free to message me with any corrections or details of cards you would like me to research and add.

Reply 2 of 4, by jedikwon

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debs3759 wrote on 2025-03-23, 22:30:

If the headers have a common track, then a 4 way rotary switch will help prevent setting two jumpers at the same time, and would be a neat solution.

That’s a great idea.

There are 2 jumpers to move around so I believe I need to buy a 2 pole rotary switch. I will give it a shot. Thank you.

Reply 3 of 4, by jedikwon

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I got a rotary switch from Aliexpress and yes indeed it works perfectly.

The attachment 386.jpg is no longer available

Now I need to find a way to mount it on the computer.

Drilling a hole in a 5.25" bay cover will probably do the job. I guess.

Reply 4 of 4, by debs3759

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jedikwon wrote on 2025-03-31, 01:25:
I got a rotary switch from Aliexpress and yes indeed it works perfectly. […]
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I got a rotary switch from Aliexpress and yes indeed it works perfectly.

The attachment 386.jpg is no longer available

Now I need to find a way to mount it on the computer.

Drilling a hole in a 5.25" bay cover will probably do the job. I guess.

That's what I'd do, if you have enough spare covers. And maybe use an old ribbon cable to keep the wiring neat.

See my graphics card database at www.gpuzoo.com
Constantly being worked on. Feel free to message me with any corrections or details of cards you would like me to research and add.