DISCLAIMER:

Before attempting the procedures outlined in this guide, please be advised that neither Mr.Atari, nor the manufacturer of this device assume ANY LIABILITY WHATSOEVER for damages caused directly or indirectly by the installation of this product. By attempting these procedures, YOU AGREE to assume all responsability and liability for any damages that may occur.

FURTHER NOTE:

This document also assumes that your OS ROM is installed in a high quality, double-contact socket on your motherboard. A small percentage of XL machines were built by ATARI without socketed ROMs. The vast majority of XL machines, however, had the ROM chips socketed from the factory. The procedures for removing a "soldered-in" ROM and replacing it with a socket are beyond the scope of this text. Furthermore, this task is (in our oppinion) beyond the level of what should be attempted by the average hobbyist. We reccomend referral of this task to a professional electronics repair facility, or to a person very experienced in removing and replacing "soldered-in" chips. DO NOT ATTEMPT TO DESOLDER YOUR OS ROM FROM YOUR MOTHERBOARD UNLESS YOU ARE SURE YOU CAN HANDLE IT.

First, remove your ATARI OS ROM from the socket.

The ROMS are located on the right-rear section of the motherboard, near the SIO (disk drive) conector. The OS ROM is the frontmost and larger of the two roms. It has 28 pins.

Next, carefully plug the MyIDE-800XL board into the socket, making sure that all pins go into the appropriate holes. The pins are designed to be very tight in the socket. It is normal for quite a bit of insertion-force to be required, but make absolutely sure that all of the pins are going in straight before applying downward pressure.

Now, if you have an EPROM (MyIDE Internal BootROM), insert it into the 28 pin socket on top of the MyIDE-800XL board.

If you'd like to program your own Boot ROM, the OS ROM images can be downloaded from Mr.ATARI's website, and programed onto a 27128 EPROM.

If you do not plan to use a Boot ROM, insert your original ATARI OS ROM into the 28 pin socket on the MyDE-800XL board.

Now Find the 14 pin IC on your motherboard that has 74LS138 printed on it. Hook Wire C (shown above) to PIN 14 of this IC.

Next, locate the 6502C CPU on your motherboard. There is a row of large chips across the front of the 800XL motherboard. The 6502C CPU is the second chip from the right. This chip has 40 pins, and is marked CO14806. Hook Wire B to pin 36 of your 6502C CPU. Hook wire A to pin 39 of your 6502C CPU.

If you are installing a Hardisk Activity LED, connect it to J1 on the MyIDE-800XL board.

If you will be using a Transcend(tm) Flash module, or an IDE-CF adaptor that requires +5v power on pin 20 of the IDE connector, then place a jumper on J2, otherwise make sure the jumper is removed from J2.

If you are using a TRANSCEND(tm) Flash module, then just plug it into the IDE header on the MyIDE-800XL board, and skip the rest of this step.

If you are using a CF-IDE adaptor that has a separate power input (does not get its power from pin 20 of the IDE connector), then you will have to provide 2 wires, +5v and GROUND to your CF adaptor.

If you are using an IDE-NOTEBOOK adaptor (see picture below), you will have to provide +5v and GROUND to this adaptor as well.

Both +5v and GROUND can be found on the back of the power connector of your 800XL. We recomend 14ga or thicker wire for this purpose.

PLEASE DO NOT TRY TO POWER ANYTHING LARGER THAN A NOTEBOOK HARDISK OFF OF YOUR ATARI's FACTORY POWER SUPPLY! YOU WILL BURN IT OUT!

Most notebook drives draw between .5amps and 1.0amps. Some ATARI power supplies are rated at 1.5amps. Others are rated lower. If your power supply is rated less than 1.5amps, do not attempt to power ANY HARDISK internally, without first upgrading to a larger current capacity power supply.

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Please refer to Mr. Atari's other on-line guides for detailed instructions on how to format,partition, and install operating systems and software on your drive or flash device. Thank you for your interest/purchase, and best of luck to you from Mr. Atari and the MyIDE-800XL team.