Remove the cover from the computer by releasing the six screws on the bottom of the unit.
Step #2Carefully lift the keyboard to reveal the flex cable connecting it to the main PCB.
Gently pull upwards at the base of the flex cable to part it from its socket.
Be very careful with this cable, bending it can destroy it.
If your 800xl still has the RF shield installed, you will need to remove it to access the PCB.
RF shield types vary on the 800XL, usually it requires you remove a number of screws around the edge of the board. Some shields are kept on with rivets that must be removed from the bottom.
Step #4After removing the RF shield, locate the OS ROM on the motherboard. Its location is marked on the photograph. If your OS ROM is soldered in, continue to step 5 to replace it with a socket. If the OS ROM is socketed, skip ahead to step 8.
Step #6Carefully desolder the OS ROM. Be very careful when removing the ROM after desoldering. The traces on the 800xl motherboard are VERY FRAGILE and will delaminate easily from excess heat or force. If the ROM does not lift out easily, re-check your desoldering work before proceeding. In the empty place where the OS ROM was located, install and solder in place the 28-pin DIP socket included in your installation kit. The completed work is shown here, with a socket ready to accept the Warp+ OS upgrade.
Step #8Carefully remove the OS ROM from its socket and place it in the anti-static container your upgrade came in. If you ever want to restore your computer to it factory configuration, you will need this ROM.
Remove the Warp+ OS upgrade board from its package and insert the board into the OS ROM socket.
The photo on the right shows the correct orientation of the OS board in the Atari. Do not insert the board backwards or it will be damaged. Damaged boards will not be replaced.
DO NOT APPLY EXCESSIVE FORCE INSERTING THE BOARD.
If you encounter too much resistance inserting the board into the socket, check the alignment of the pins in the socket and make sure it is correct.
Press straight down on portion of the board over the OS ROM socket to insert it. Do not insert the board at an angle or one side at the time, as this will bend or break the gold pins.
Once the board is inserted, look underneath it to verify all the gold pins are in the socket. If any are hanging over the edges then remove the board and re-insert into the socket correctly.
A wire set for 3 solder connections is included with your OS upgrade.
Connection point 'D' is the left side of R87 in the 800xl.
Connect the WHITE wire to this point.
Connect the RED wire to this point.
Connection point 'S' is the center pad in a group of three on far the right side of the board.
See the large photo above for its location. The photo to the right is a close-up of this location
Be careful not to bridge the connection between any of these pads.
Connect the BLACK wire to this point. If your kit has two
black wires, cut one of the black wires off near the connector, it is not required.
It does not matter which black wire you remove.
Once you have soldered the 3 required connections, you must plug them into the header on the OS Upgrade board.
Connect the plug to the header so that the RED wire is on the same side as the asterisk (*) printed on the circuit board.
Attach the power and monitor connections to the Atari and turn it on.
The system should start normally (possibly with a dark-blue screen), and you should reach BASIC or SELF-TEST.
If the system does not function normally, check all connections.
Reassemble system and re-test.
On some models you may have to bend, cut or omit the RF shield during reassembly to make room for the module.
Hold SELECT down on the keyboard while powering up the Atari to reach the OS Selection Menu.
The descriptions you entered when building your OS will appear on screen. Simply select a new OS using the keyboard and the system will reboot using that OS.
Every time you power on the Atari it will use the OS you selected. To change the OS again, just hold down SELECT while turning on the computer.
You may also hold SELECT+OPTION down on the keyboard while powering up to reach the APE Remote Control software.