MyIDE Internal Installation Guide

For Atarimax MyIDE w/ Flash OS in 800XL

Step #1

Remove the cover from the computer by releasing the four screws on the bottom of the unit.

Step #2

Carefully 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.

Step #3

If your 800XL still has the RF shield installed, you will need to remove it to access the PCB.

To remove the top RF shield you must remove the screws and straighten a number of metal tabs around the edge of the shield using needlenose pliars.

After unbending these tabs, the top shield should lift off.

Step #4

After 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 #5

In order to desolder the OS ROM, you will need to remove the motherboard from the case and remove the lower RF shield.

To remove the PCB and lower RF shield, remove the six phillips screws holding the board to the case. Three are located at the front of the PCB. The others are located at the rear near the power switch, monitor jack and SIO port.

Mounting screw position may vary by where and when your 800XL was manufactured. Once you have all the screws removed, you can carefully life the PCB out of the case.

The lower RF shield is held in place by the tabs you straightened in step 3 and should come off without any extra effort if the tabs are straight.

Step #6

Carefully 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 MyIDE upgrade.

Step #7

Testing the socket installation.


Take the original OS ROM you desoldered, straighten any bent pins, and carefully insert it into the new socket.

Hook up the power and monitor connections to the Atari and verify the system operates normally.

If the system does not operate normally then you need to recheck your socket installation work.

The most common sources of failure at this point are torn traces, bent socket pins or an improperly inserted OS ROM.

DO NOT PROCEED past this step until the system functions normally.

Step #8

Carefully 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.

Step #9

Remove the MyIDE Internal 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.


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.

Step #10

A wire set for three solder connections is included with your kit.

This harness has four wires, one red, one white and two black. The two black wires for are the same signal, so cut off one of the black wires close to the harness connector, it does not matter which one.

Locate the GTIA IC on your 800XL main board using the diagram above.

Connect the white wire to GITA pin 33.

Connect the black wire to GTIA pin 30.


Locate the 74x138 IC on your 800XL main board using the diagram above.

Connect the red wire to 74x138 pin 14.


Step #11

Once you have soldered the 3 required connections, you must plug them into the header on the Upgrade board.

Please see the orientation diagram above before plugging in the wire harness.

You must plug the wire harness into the 4-pin header on the PCB that is facing the front of the 800XL. Align the harness as shown in the orientation diagram above with the RED wire closets to the '*' printed on the PCB near the header.

Attach the power and monitor connections to the Atari and turn it on.

The system should start normally 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 made need to omit the RF shield during re-assembly or make a hole in it to accomodate the module.