Editing Atari 800 General Maintenance (section)

=== Internal Voltage Rails ===
The Atari 800 generates regulated DC voltages internally:

{| class="wikitable styled-table" style="width:80%; text-align:center;"
! Rail !! Test Point / IC Pin !! Expected Value
|-
| +5V DC || 6502 pin 8 || 4.95 – 5.20V
|-
| +12V DC || 4050 pin 1 || 11.8 – 12.3V
|-
| -5V DC || 4050 pin 8 || -4.8 – -5.2V
|}

* Test at the mainboard edge connector or directly at IC pins.
* If rails are out of spec, suspect the 7805/7812/7905 regulators or input capacitors.