The Atari 2600’s CPU is the MOS Technology 6507, a version of the 6502, running at 1.19 MHz in the 2600. Though their internal silicon was identical, the 6507 was cheaper than the 6502 because its package included fewer memory-address pins—13 instead of 16. The designers of the Atari 2600 selected an inexpensive cartridge interface that has one fewer address than the 13 allowed by the 6507, further reducing the already limited addressable memory to 4 kiB (212 = 4096). This was believed to be sufficient as Combat is itself only 2 kiB. Later games circumvented this limitation with bank switching.
The console has 128 bytes of RAM for scratch space, the call stack, and the state of the game environment.
The top bezel of the console originally had six switches: power, TV type selection (color or black-and-white), game selection, player difficulty, and game reset. The difficulty switches were moved to the back of the bezel in later versions of the console. The back bezel also included the controller ports, TV output, and power adapter outlets.
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Originally posted on October 21, 2020 @ 5:25 pm