Hardware management of older processors, where to start?

Question

Do it yourself

The idea is to connect some kind of harness to the old processor and run it without a motherboard, connect something like an stm32 type microcontroller to it, and, for example, read the temperature sensor.
Ideally, the ultimate goal is to be able to load some small algorithm into it in order to count. Is there any chance of success? What kind of documentation to start with to approach this?

Answer 1

It depends on how old the processor is. If i8086, then there is a lot of documentation for it and its analogues, there should not seem to be any problems. The question is why? STM32F407 is comparable in performance to intel 80486. And newer processors will be very difficult to connect.