Inserting the BIOS Back

Be careful to not place the chip in wrong position, or you will probably literally burn out the BIOS chip. Both the chip and its socket have a marking called “pin 1”. You have to march the pin 1 marking on the chip with the pin 1 marking on the socket.

Pin 1

Figure 8: Pin 1 notches on DIP chip and socket.

Pin 1

Figure 9: Pin 1 notches on PLCC chip and socket.

PLCC chips are easing to be installed back, because one of its side (the pin 1 side) isn’t squared but triangle-shaped. Thus, it is impossible to insert them in the wrong position.


Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.