AT Computer Case MHZ frequency LCD display \ VOGONS

AT Computer Case MHZ frequency LCD display

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First post, by renojimmy

Posted on 2018-11-28, 05:16

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Hello, first time poster. I spent a couple hours yesterday searching this forum trying to find if anyone ran into a similar issue. I have an AT computer case and the LCD front display is parked at a set integer. If anyone has links to a post that may be a duplicate, please share. I took some (bad) pictures.

The computer is an AT pentium 2 slot 1 mobo 66mhz fsb from around 1998, and the case I believe is a bit older. It's an Elpina slot 1 i440lx motherboard, if anyone can help find the manual that would be great. I believe this may be a a copy paste clone of another mobo.

There's no turbo setting on the pinout where you'd typically find it on a 386/486 motherboard, and there's certainly no dip switches for setting the lcd. I'm wondering if this AT computer case was purpose built to interface with jumper settings on a specific motherboard? I'm guessing that at some time 20 years ago this LCD displayed a 133 or 200 or whatever, but right now it's just showing 455 🤣

Reply 1 of 6, by SW-SSG

Posted on 2018-11-28, 05:38

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The motherboard is probably the PC Chips M715. PC Chips boards often went by various alternative brand names, such as Amptron and Elpina, which explains your particular example.

As for how to program the turbo display, someone else here on the forum should know; personally I've never seen one with zero jumpers or dipswitches at all for configuration...

Reply 2 of 6, by Der_Richter

Posted on 2018-11-28, 08:52

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Investigate the pins on the top row... It looks as if those are where you may need to put jumpers to set the display.

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Reply 3 of 6, by wiretap

Posted on 2018-11-28, 10:10

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The display is probably programmable via button presses. I heard some of them required a jumper to be placed, then you can use the turbo button to set the high & low numbers. (similar to an extremely basic alarm clock) Try holding down the RESET button to see if it goes into programming mode.

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Reply 4 of 6, by renojimmy

Posted on 2018-11-28, 11:35

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Der_Richter wrote:
Investigate the pins on the top row... It looks as if those are where you may need to put jumpers to set the display.

for the suggestion. I even pulled out the motherboard to see if there were some jumpers underneath 🤣

wiretap wrote:
The display is probably programmable via button presses. I heard some of them required a jumper to be placed, then you can use the turbo button to set the high & low numbers. (similar to an extremely basic alarm clock) Try holding down the RESET button to see if it goes into programming mode.

That worked! That really made my day, I appreciate it. I wish I could buy you a beer!

Reply 5 of 6, by Der_Richter

Posted on 2018-11-28, 11:44

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Guess my eyesight is really deteroriating with age. I could have sworn it had a top row of jumpers, like found on some turbo/speed displays. I see now that it has none. Sorry... On the other hand you got a chance to dust underneath the MB 😀

Preserver, refurbisher, collector. In that order.

Reply 6 of 6, by renojimmy

Posted on 2018-11-28, 11:51

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Der_Richter wrote:
Guess my eyesight is really deteroriating with age. I could have sworn it had a top row of jumpers, like found on some turbo/speed displays. I see now that it has none. Sorry... On the other hand you got a chance to dust underneath the MB 😀

I thought those solder dabs were pins as well until I got a flashlight on them. I couldn't wrap my head around how that LCD was configured, there were no jumpers. I figured it had to be a keystroke combination, or it had something to do with the fact the motherboard doesn't have a turbo connector. It makes a lot of sense that it was manipulated by holding down the reset button. Thank goodness it wasn't the turbo button that needed to be held down 🤣

edit: I also thought that maybe the case was configured with a specific motherboard in mind, and that's where the jumpers/dips were.

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