internal power supply unit for vintage laptop?

[hollandusa]

laptops now have an external PSU but earlier predecessors like with a small but foldable screen had a built-in PSU just like a desktop. I want to learn more about a brand/model that has this built in.

 

[modem7]

I want to learn more about a brand/model that has this built in.

An example is the Toshiba Satellite Pro 430CDT.
Information at [here].