What to do if power LED is not ON and there is no picture on Atari 400?
If the power LED is off and there's no picture on your Atari Desktop, the power supply might be damaged and needs to be replaced.
Why does my Atari 400 Desktop show a green screen, black screen, random characters, or lock up?
If you are seeing a green screen, black screen, random characters on the screen, or the unit locks up on your Atari Desktop, it could be due to loose or dirty contacts with the RAM or CPU boards on the motherboard. Clean the RAM Memory PCB and CPU PCB contact fingers following the instructions in paragraph 5.2.1, PCB Contact Cleaning and Lubrication.
What to do if my Atari Desktop will not perform math calculations?
If your Atari Desktop won't perform math calculations, the CPU board may be damaged and needs replacing.
What to do if I have screen oscillation when using Paddle Controller on Atari Desktop?
If you experience screen oscillation when using a Paddle Controller with your Atari Desktop, the motherboard requires an engineer fix. Send the motherboard for repair.
General| Manufacturer | Atari |
|---|---|
| Model | 400 |
| Type | Home Computer |
| Release Year | 1979 |
| CPU | MOS Technology 6502 |
| CPU Speed | 1.79 MHz |
| ROM | 10 KB |
| Operating System | Atari OS |
| Keyboard | Membrane keyboard |
| RAM | 8 KB (expandable to 48 KB) |
| Graphics | ANTIC and GTIA chips |
| Sound | 4 channels |
| Display | RF output for connection to TV |
| Storage | Optional cassette tape drive or floppy disk drive |
| Ports | Cartridge |
| Display Resolution | 320x192 (16 colors) |
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