Hum,
1. Place the A1200 unit upside down on a flat surface.
2. Use a screwdriver to remove the five case screws.
3. Turn the unit to normal, face front position. Do carefully flip backwards the top cover
and then the keyboard assembly.
IMPORTANT: Take care not to damage the cables to the top cover or the ribbon cables to the
keyboard assembly.
4. The main printed circuit board - protected by a shield - is now in full view. The
operating system ROM ICs are labelled and located at position U6A (under) and U6B (upper),
just at the blank of the shield. The old ROM chips should be marked: @1992 V3.0 39.106
5. Note the orientation of the old operating system ROMs, and then remove them from the socket.
IMPORTANT: You should be aware of the fact that there are spare pins at the sockets. You
have to align the ROM ICs to the right side of the sockets so that there are spare pins at
the left of the ROM ICs.
6. Align the 3.1 ROMs with socket U6A and U6B, and press firmly into place. Be cautious
not to bend pins.
7. Installation is now complete.
Guide link hereGood luck...
