how to unlock bios keyboard

May 21, 2019 at 10:41:14
Specs: BIOS boot award, 25 Mhz 486sx
4DMS HL3G-L4-VI Motherboard, It was working fine then this message start showing up and no booting after this. "keyboard locked, unlock keyboard ' Any idea as qhat to do here?

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#1
May 21, 2019 at 11:07:18
From pics on the web, appears to be an older 486-era board with a DIN-5 keyboard connector. If another keyboard doesn't work, it could be the keyboard controller (or keyboard lock switch...if it had one) has gone bad.

"Channeling the spirit of jboy..."

message edited by T-R-A


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#2
May 21, 2019 at 12:15:59
Yeah probably the 'keyboard lock' somehow got engaged. A lot of those old motherboards had jumper pins to lock the keyboard. They were meant to connect to a push button or keyed switch on the front panel of the case. If yours is that way maybe you unintentionally engaged it. If that's not it open the case and locate the pins. Remove their wired connection to the front panel so that feature won't activate.

message edited by DAVEINCAPS


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#3
May 21, 2019 at 12:26:40
Yes 486SX doing 1996 and earlier auto diagnostics. Reset BIOS jumper., took a nap, re-set jumper, put the machine together and it started working again. even I already did the bios reset for 30 secs before. .Makes me appreciate how trouble free computers are these days than they were 25 yrs ago. Jumpers, memory addresses, Power/CPU/BUS settings, it was a flashback to my early days. Thanks for your inputs, it might be the kb controller going bad. No button on front I look for it.

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#4
May 21, 2019 at 12:46:30
"...how trouble free computers are these days than they were 25 yrs ago."

Guess that depends on perspective... I'm feel that they were far less trouble 15-20 years ago (when I actually was heavily involved in repairing them).

"Channeling the spirit of jboy..."


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#5
May 21, 2019 at 16:36:20
I was building them in 1994 and jumper settings for voltages, bus, multiplier , memory addresses and com port conflicts, place the right amount of cylinders heads and sectors so the BIOS recognize the HD. All these annoyances are a thing of the past it was very frustrating with DOS and Win 3.1. If building a computer was straight forward and it was a pain, troubleshooting them was horrific, you needed the mobo manual to see if jumpers were correct and one jumper did not fall while the computer was moved. or the customer decided to take it out and placed it back, in the wrong place and the typical answer of "NOTHING" when you asked them: "What did you do?" . (personal experinces here). No I think that computer are more stable these days and trouble free. On he other hand we are loosing control of our data, .

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#6
May 21, 2019 at 16:41:44
Even though there's no keyboard lock on the front panel the motherboard probably has the pins for it. Unless someone has been inside the case it doesn't seem likely they're the problem but still it would be a good idea to make sure there's no incidental contact between them. If that's not it, sometimes the keyboard controllers are socketed. If so try removing it and reinserting it.

My first computer was a commodore 64. Right next to the on/off switch was a game port. The first day I had it I reached around to turn it on and zapped the game port instead Fortunately the store replaced it.


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