First post, by einr
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So I'm working on building my 486, and it's getting to be a lot like whack-a-mole... Pound down one problem, another pops up on the other side of the board 🤣
Quick backstory: found a complete 486 DX4/100 at a flea market. Everything worked fine except the motherboard which was dead. Bought a new board off eBay. New board (M Technology R407E/V with AMIBIOS) came with RAM and a DX-33 CPU. It booted fine the way it was. Tried putting the new board into the old case. New board has different layout; 72-pin RAM slots blocked by 5,25" drive cage. Order new 30-pin RAM. Install motherboard in case, replace DX33 with DX4, install 16 megs of 30-pin RAM. Connect all the buttons and LEDs. Boot it up, everything eventually works fine... Except!
After putting the motherboard into the case, installing new RAM, and switching around the cards a bit, now my mouse doesn't work.
The mouse is a serial Microsoft mouse that definitely worked with the same motherboard and I/O ISA card before I put it in the case. While working on the board I might have switched around the positions of the ISA cards etc. Don't really remember how it was.
So: I plug the mouse into COM1 on the multi I/O card. MOUSE.COM detects it fine, MSD.EXE shows correct-looking mouse info, and the mouse pointer shows up:
However, mouse is immobile. Can't move the pointer. So I check the IRQ settings and this looks really weird:
Why would it show IRQ 0 as being handled by the mouse driver? Isn't this wrong? What's going on here? What should I do? Honestly, don't know where to even start with troubleshooting this. Help appreciated 😖