Motherboard Revisions
The Atari 2600 VCS Domestic Field Service Manual describes the differences as follows:
| “ | 2600A model revisions 1-13 In addition to the component changes, the physical location of several parts has also been changed. Instead of having the right and left difficulty switches placed on top of the game console, they are located at the rear, next to the game controller plugs. The channel selector switch is also located at the rear of the console. The game cartridge socket is no longer angled, but is mounted vertically on the board. 2600A model differences - revisions 14 and 15 Revisions 14 and 15 contain the model differences described above, and in addition have new components on the TIA lines, LM1 and Sync. There are two IN914 diodes to prevent feedback on the lines and two additional pull-up resistors to insure the signal is at +5v. To compensate for any signal loss, R215 and 217 have been changed to 47K (R215) and 24K (R217). 2600A model differences - revisions 16 and up |
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Read more about this topic: Atari 2600 Hardware
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