Everything looks good. J7 is set correct. Are you sure you have the PS/2 port wired correct ? I have a pinout from Asus that shows their 6/8 pin PS2 port for most 486 and pentiums like this:
1 2 3 4 : 1 =Gnd, 2 = Data, 3 = NC, 4 =VCC, 5 = Clk, 8 =NC
0 0 0 0
0 - - 0
5 6 7 8

Horun wrote:

Everything looks good. J7 is set correct. Are you sure you have the PS/2 port wired correct ? I have a pinout from Asus that sho […]
Show full quote

Everything looks good. J7 is set correct. Are you sure you have the PS/2 port wired correct ? I have a pinout from Asus that shows their 6/8 pin PS2 port for most 486 and pentiums like this:
1 2 3 4 : 1 =Gnd, 2 = Data, 3 = NC, 4 =VCC, 5 = Clk, 8 =NC
0 0 0 0
0 - - 0
5 6 7 8

Yep, triple checked my wiring.

Have you tried bridging the fuse at the top left corner?
This fuse is meant to prevent overcurrent from hot plugging keyboard or mouse. Sometimes it semi breaks, creating enough resistance that some devices work and some don't.
If bridging the fuse helps don't forget to replace it with a new one. 😀
Oh and of course no hot plugging mouse or keyboard especially while the fuse is bridged. 😁

Doornkaat wrote:

Have you tried bridging the fuse at the top left corner? This fuse is meant to prevent overcurrent from hot plugging keyboard or […]
Show full quote

Have you tried bridging the fuse at the top left corner?
This fuse is meant to prevent overcurrent from hot plugging keyboard or mouse. Sometimes it semi breaks, creating enough resistance that some devices work and some don't.
If bridging the fuse helps don't forget to replace it with a new one. 😀
Oh and of course no hot plugging mouse or keyboard especially while the fuse is bridged. 😁

Thanks for the reply - do you mean bridging it like this?

Exactly - assuming those are both ends of the same yellow wire.
(Although I would have just soldered a small wire in parallel but your approach is probably more professional. 😁 )
Any luck with this so far?

Doornkaat wrote:

Exactly - assuming those are both ends of the same yellow wire.
(Although I would have just soldered a small wire in parallel but your approach is probably more professional. 😁 )
Any luck with this so far?

No luck - powered it on with the bridge in place but no change in behavior 😐

Too bad. 😒
One more thing: Does your BIOS support PS/2 mice and have you enabled IRQ 12 for mouse in BIOS under Power Management Setup?

I think it supports PS2 mice since the BIOS I programmed was the latest one from Phil’s website. I did enable IRQ 12 in power management.

I ordered a replacement AMIKEY-2 chip yesterday. My plan at this point is to use a logic analyzer and oscilloscope connected to the ps2 header to try and capture what’s happening. Based on that I may desolder the AMIKEY-2 and replace it. I’m also considering recapping the entire board. Uggggh.

Still haven't solved this unfortunately. I find it interesting that I can enter BIOS by pressing the delete key, but then the keyboard stops working once in the BIOS..

Does anyone know what pins on the AMIKEY-2 go to the chipset that would relate to PS2 functionality? I'd like to check continuity. Also would appreciate any other ideas people have for troubleshooting!

Updates

• Replaced most of the through hole tantalum capacitors on the board (haven't done any of the SMD ones)
• Verified 5v is being supplied to the PS2 connector after boot with a mouse and keyboard connected
• Bypassed main fuse (top left of board) with soldered wire - no effect

Other than replacing the controller like you plan to do I only have a few crapshots left:
Try flashing the BIOS again. Maybe it's partially corrupted?
If you're currently using the latest beta BIOS use the latest official one or vice versa.
Remove all cache and try again.

Got the mouse working! Desoldering the AMIKEY-2 and replacing with one I got from eBay did the trick 😀

Great job ! Would not have thought the KB controller was the problem but it was