Texas Instruments TravelMate 4000E
PC laptop from Texas Instruments. Uses a "486 WinDX2" processor. The 4000E appears to have been available in color or monochrome versions.
Gallery
Power Supply
Here are the voltages on the wires when laptop is on|off
1 - green wire=0.10v|0.0v
2 - white wire=5.70v|6.75v
3 - both blue and red wires=5.27/5.40v|5.27v/5.27v
shield - both yellow and black wires and both are connected to ground on the PSU