Bought Fujitsu Lifebook 520T not so long ago, and realised there's not very much info on that thing online.
The reliable info i found were some files on Internet Archive:
https://archive.org/details/pcworld152unse_0/ … /76/mode/2up?q= - PC World Magazine (February '97).
https://archive.org/details/boot-magazine-iss … su+Lifebook+500 - Boot Magazine: Issue 04 - Lust List 96 (Dec 1996)
About specs:
CPU 120MHz Intel Pentium

External Cache 256K pipeline burst

RAM 16MB EDO DRAM

Video Cirrus Logic CL-7548, 2MB VRAM

Hard Drive 1 Fujitsu 1CGB EIDE

Still haven't powered it up yet! Bought a charger that might fit, but it is still in delivery so I'm waiting.
The hypothetical problem it has is that Hard Drive makes Weird noises when i flip the laptop, like something is loose there and metal is clinging against other metal piece. We'll see if there's really a problem with it, if so, it is possible to change it with CF adapter with some old-ass CF card i can get on flee market. The other option is to replace it with SD to IDE adapter, but i will need to find a way to power it because it need (totally not gonna solder any wires onto motherboard).