HP-95LX  palmtop personal computer

Battery acid corrosion - the biggest enemy of any electronic equipment.

Self test.

Easter egg hidden inside the self test:

Use a Torx T6 screwdriver to undo the 4 screws hidden by the four rubber feet.

Intel versus NEC. In the picture:
NEC μPD71055C PIU from 1986.
NEC μPD70108C aka V20 16-bit CPU from 1986 (clone of Intel 8088)
Intel 8080A 8-bit CPU from after 1974.

BASIC on a chip.

Intel P8052AH-BASIC Version 1.1 from 1983.