Home Video Game Systems of the 1970s and 1980s
| System | Manufacturer | System type | Approximate number of units sold worldwide |
|---|---|---|---|
| Famicom Disk System | Nintendo | console | 4,000,000 |
| ColecoVision | Coleco | console | 2,000,000 |
| Atari 2600 | Atari | console | 18,450,000 |
| ZX Spectrum | Sinclair | computer | 2,300,000 |
A student is writing a research paper on the global rise of the home video game industry during the 1970s and 1980s. The student is surprised by differences in the number of units sold by some systems compared to those sold by others. Most remarkably, the __________