Yes, it is generally true that modern microwaves have significantly more computational power than computers from the 1980s.
Microwaves today often incorporate microcontrollers or microprocessors as part of their control systems. These microcontrollers are capable of executing complex instructions and handling various functions within the microwave, such as controlling power levels, timers, and sensor feedback. While the computational capabilities of these microcontrollers may not be on par with modern high-end computers, they still offer considerable processing power for the specific tasks they are designed to perform.
In contrast, computers from the 1980s had relatively limited processing power and memory compared to today's standards. They typically featured slower processors, lower memory capacities, and lacked many of the advanced technologies and optimizations present in modern computing devices.
Therefore, it is safe to say that the processing power available in a modern microwave exceeds the capabilities of computers from the 1980s. However, it's important to note that the design and purpose of a microwave and a computer are fundamentally different, with each being optimized for their respective functions.