- A cart inserted in the system to keep the dust out of the hole.
- TIA ASIC. What makes an Atari an Atari.
- The CPU is a 6507, which is a 6502 with only 13 address lines.
- I/O and the 128 bytes(!) of RAM are in this off-the-shelf chip.
Atari 2600 innards and my "dust cover" cart.