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Inside the Atari 2600 - Hardware Secrets
https://hardwaresecrets.com/inside-the-atari-2600/
The Atari 2600 came with a pair of joystick controllers and a pair of paddles. The joystick was a digital model, meaning that it was comprised of one switch for each direction you wanted to …
Atari 2600 hardware mod - Michael Richmond
https://www.smallersystems.com/blog/2013/09/atari-2600-hardware-mod/
The stock Atari 2600 produces an RF modulated video/audio signal as output. On old TVs the RF signal connects to the antenna-in jack. On modern TVs it is often easier to hook up a composite video input. Eliminating the RF modulation should also improve the picture quality.
Atari 2600 Specifications - problemkaputt.de
https://problemkaputt.de/2k6specs.htm
Atari 2600 Video Computer System (VCS) Manufacured 1977-1991 Chipset CPU 6507 - 8bit, 1.19MHz TIA 1A - Television Interface Adaptor Model 1A (Video, Audio, Input Ports) PIA 6532 - (128 bytes RAM, I/O Ports, Timer) CPU and Memory CPU: 6507, 8bit, 1.19MHz (cutdown 6502 with only 8K address space)
Questions About the Sound Capability of the Atari 2600 ...
https://atariage.com/forums/topic/318286-questions-about-the-sound-capability-of-the-atari-2600/
The programmer reads the DPC chip and stores the number to a volume register on the 2600 by the code, and you generally have to do this on every scanline (so it makes for somewhat difficult programming!) The numbers are calculated by the chip so that when stored to the volume register, they create a composite waveform of three (square wave) voices.
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