Advantage! 6050d/6066d © 1994 AST Research.
The AST Advantage! 6050d and 6066d are classic 486-based all-in-one desktop systems from the mid-1990s. While AST Research also produced "Advantage!" models with Pentium processors (such as the 6060P), the d suffix in your models specifically denotes their 486 heritage.
These systems were aimed at the home and small business market, often sold through retailers like Radio Shack. They were typically bundled with a wide array of software (the Adventure suite), making them quintessential "multimedia" PCs of the Windows 3.1 and early Windows 95 era.