Note: Before attempting the troubleshooting steps below, verify that you are using the latest Internet Adapter version.

"I get timeouts, lockups, and other communication issues."

This could mean one of four things...

1. The RS-422 cable is getting interference and might need to be shielded. Please connect the cable shield to the GND pin on the RS422 adapter only (find out why). Also, check your solder joints to ensure they are securely connected and not touching the outside plug surround or other wires. An insufficient electrical connection is a bad electrical connection. Your cable is the lifeline to the NABU PC; ensure it is reliable and built correctly. Note: GND should be connected to the shield only at one end. If your cable is grounded on the DTECH connector, do not connect the shield to the outer rim of the DIN connector. (find out why)
2. Keep your cable away from power cords and wires carrying AC voltage. Unless your communication cable is twisted-pair or has a shielded ground, you may experience issues due to AC voltage interference. If the RS422 portion of your cable (not the USB part) is near or touching AC power cords, you will experience a high failure rate. This is the most likely cause of issues. I recommend keeping the RS422 portion of the cable as short as possible, as it is most susceptible to interference.
3. The RS422 USB adapter may not have the required capacity for a USB HUB or docking station. Docking stations that share an HDMI output, particularly for multiple monitors or 4K resolution, may have bandwidth limitations that prevent the RS422 adapter from functioning correctly. Ensure the RS422 adapter is connected directly to a computer USB port.
4. The baud rate is incorrect because you are using a Linux system. The .NET ports library has a bug that prevents selecting the correct baud rate for the NABU. This is documented in many places on this website, and a link is provided above in the Linux section. Until this bug is fixed in the Linux .NET ports library, you will continue to experience issues if operating at 115,200 bps, which is not the correct baud rate for the NABU.
5. Clean the NABU Adapter Connection. The NABU computers are 40+ years old and have not been stored in ideal environments. The connection terminals may have corrosion, dust, or dirt that causes a poor connection. With the power off and unplugged, I sprayed the plugs with 99% alcohol and pushed the mating plugs in and out a few times (that's what's said).

"The log gives me either 00 or 3E errors."

The cable is connected backward. That means your RX is connected to the TX of the NABU. Also, verify the polarity. We're not. That's why so many DIN diagrams are incorrect online. We provided the correct pinout of the DIN connector on this page above, taken from Wikipedia. The image looks at the soldered part of the connector, not the part that goes into the NABU. That means you hold the connector with the soldered part facing you so that you can match the pins to the diagram.

"I get an error that 00 was received."

The value of 00 means NULL. This means the cable has been connected incorrectly to the RS422 USB adapter. Verify the NABU'NABU'stive wires connect to the RS422RS422'stive wires and the NABU'NABU'stive wires connect to the RS422RS422'stive wires. Also, ensure the transmit connects to the receive, and the receive connects to the transmit. There have been reports that 5 Pin DIN connector drawings on the internet are incorrect. Please refer to the correct drawing on this page.

"What kind of joystick can I use on the NABU?"

Any Atari-style joystick will work with the NABU. Get an Atari-compatible joystick and plug it into the keyboard's joystick port.

"Putty does not display the Internet Adapter correctly."

If you experience an issue using the Internet Adapter with PuTTY, please configure the correct terminal type in PuTTY's settings.

1. In PUTTY settings, go to Settings->Connection->Data->Terminal-type
2. And enter xterm-256color

"Access Denied on COM Port in Linux or MacOS."

If you receive Access Denied when attempting to use the COM (/dev/ttySx) port, you may require ROOT. In that case, launch the application with the sudo command.

$ sudo ./NABU-Internet-Adapter-84

"The Internet Adapter crashes immediately and does not load."

Some Linux distributions (including Ubuntu) have an issue where the Internet Adapter fails to load and crashes immediately. This can be fixed with a solution found by a user named jefferystone. He suggests the following...