PowerBook 540c

The Apple Macintosh PowerBook 540c features a 33 MHz 68LC040 processor, 4 MB or 12 MB of RAM, and a 320 MB or 500 MB hard drive in a sleek portable case with a 9.5" color active-matrix display.

The PowerBook 540c is similar to the PowerBook 520c, but has a faster processor and a higher quality 8-bit and active-matrix display.

Source https://everymac.com/systems/apple/powerbook/specs/mac_powerbook540c.html