Reply 20 of 66, by Deunan
For the most part, yes. Unfortunately on most 286 mobos (except the very late ones with advanced chipsets) the KBC does have several more functions than just keyboard I/O. It controls A20 gate/mask, it can reset the CPU (and NPU), and some input port pins might be connected to jumpers, things like color/mono monitor select for example. So a swap with different KBC won't always work. Frankly I had a pretty bad record of trying to do just that but then again I've read plenty of posts where it worked (at least good enough to figure out if original KBC was faulty) - so maybe I'm just that unlucky.
So, would it be worth trying a different one - yes, if you don't have to pay for it. A swap from another mobo you have in other words. Otherwise I'd wait for some more test results. Well, unless money is not a problem, then go ahead 😀
UPDATE: Here's a set of files to program and test. EVEN goes into what is U47, ODD into U48. These are 32k images but should hopefully also work if the mobo uses only upper 16k part. I was unable to test it on my 286 mobo, I messed up a few days ago and broke a pin on one of my W27E512 - and I only have 2, ordered more but haven't arrived yet. I don't want to solder it back as the solder blob could damage the socket, so I can only hope I didn't mess this up. You should see some values on the POST card, 3 sets actually but the first 2 could be very brief so try to maybe capture a video, or de-turbo the mobo to 6MHz, or both. After the last set the code will stop, so reset to make it run again.
Please report the codes shown, and if there are none it's likely there's some ROM addressing issues on your motherboard.