1. The old school way to game…
Retro Pi
The old school way to game…

2. Atari 2600 Available September 11, 1997 Discontinued January 1, 1992
Initial price: $199
CPU: MOS 1.19 MHz
Max cartridge size: 32 kilobytes
Max colors: 128
Input devices: joysticks, paddles, keyboards, and other 3rd party devices
Source:

3. Nintendo NES Released: October 18, 1985 (North America)
Discontinued: August 14, 1995 (North America)
Initial price: $299
CPU: MOS 1.79 MHz
Max cartridge size: 2 megabytes
Max colors: 54 (25 at a time)
Input devices: controller, zapper gun, power pad, power glove, and other devices
Source:

4. Raspberry Pi Released: February 2012 Discontinued: N/A
Initial price: $35
CPU: ARMv6k 700 MHz
Max cartridge size: 32GB+ (SDHC or USB)
Max colors: 16 Million (HD 1080p)
Input devices: USB
Source:

5. Playing Old School Games
Option 1: Buy old hardware
EBay, garage sales, and thrift stores
Option 2: Use emulators and Rom Files
Available for many different types of devices
Note: You must own a legal copy of the game to legally download Rom files