Installation of the 16c54 6-wire Mod
for an 80-pin QFP PlayStation
Removal of the PSX cover
- Turn unit over and remove the 5 screws.
- Turn unit right-side up, and lift the cover off.
Removal of the laser housing
- Disconnect the ribbon cable by pulling straight up on the black connector. This will release the cable, which can then be removed, by pulling straight up.
- Disconnect green connector (3 grey + 1 white wire) by pulling straight up.
- Disconnect collection of rainbow colored wires by pulling straight up.
- Lift off laser housing.
Removal of the controller/memory card housing
- Remove the 5 screws holding the thin metal bracket in place.
- Lift off the bracket.
- Disconnect the ribbon cable by pulling straight up.
- Lift off the controller/memory card housing.
Removal of the heavy metal bracket
- Remove the 5 screws holding the bracket in place.
- Lift off the bracket.
Removal of the circuit board
- Remove the 3 screws along the top edge.
- Lift off the circuit board.
Mounting the chip
- Carefully bend the the pins of the chip so they are parallel with the chip. Now when the chip is placed right-side up, the profile is much lower.
- Locate the area near the upper right corner on the back-side of the board. You will see 2 large chips. One, an SEC Korea chip and the other, the 80-pin QFP. The instructions that came from the chip manufacturer specify an 80-pin QFP chip (SSAS9544B). This number is not correct. In this case, all 80-pin chips are the same. So, if you have an 80-pin QFP, this mod should work for you. The pins on this chip arent numbered, but they follow convention. While looking at the chip, so you can read the writing on it, the pin on the far left along the bottom edge is pin number 1. Count up as you go along the edges of the chip, in the counter-clockwise direction. This will place pin 80 just to the left and up a bit from pin 1. If this is confusing, look on the front of the board, many of the chips have their pins numbered there.
- Carefully glue the chip upside down between these two chips. (A small bit of silicone works nicely, but its your call).
Making the connections between the chip and the PSX PC board
Relevant pins of the 18-pin 16c54 chip
With the chip right-side up and the notch at the top, pin numbers are read
counting down the left side from 1 to 9, and up the right side counting from 10 to 18. Pin 18 is located directly across the chip from pin 1.
4 - pin 20 of QFP
5 - GND
7 - pin 32 of QFP
8 - pin 2 of 082B
14 - VCC
16 - pin 22 of QFP
Key for subsequent diagrams
Pin 4 -> pin 20 of QFP
Pin 5 -> GND
Pin 7 -> pin 32 of QFP
Just to the left of, and about 1.5 inches below the SEC Korea chip.
Pin 8 -> pin 2 of 082B
Just below that same chip.
Pin 14 -> VCC
Locate a 7805 regulator approximately 3 inches diagonally up and to the left
from the bottom right of the board. This regulator will only have three pins
on it, all on the top side of the chip. Connect pin 14 on the 16c54 to the
leftmost pin on the regulator.
Pin 16 -> pin 22 of QFP
That's all there is to it. Be sure to insulate the chip from the metal plate on the bottom of the PSX. Now, just reverse everything you did to take this thing apart,
and you're done. Fire it up and play your imports without having to swap ever again.