First post, by feipoa
- Rank
- l33t++
The Chaintech 486SPM, like the MSI MS-4144, has solder pads in place for native PS/2 mouse implementation. If you want to add PS/2 support to the Chaintech 486SPM, I've added some easy to follow images of which components need to be added on. I tested the mouse and it is working fine.
You can also add a coin cell CR2032 battery holdfer if you pull up D1, which would otherwise charge the battery.
If you want to add variable voltage support, replace the 909 ohm resistor with a 1 Kohm trimmer as shown. This will give you a variable 3.0 - 4.1 V to the CPU.
What's needed (for the PS/2 mouse addition):
2x 3-pin headers w/jumpers
3x 2-pin headers w/jumpers
1x 4-pin header w/PS2 mouse connector
2x inductors ~1-6 uH
2x SMD capacitors, 47 pF
2x SMD resistors, 10 Kohm
1x 7406 inverter IC
Use Modbin to add PS/2 support to your AWARD BIOS. Actually, I will just upload my modified BIOS here.
Click images for larger resolution.
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