11

The 68000 does nothing; it is entirely disabled. Ditto the Yamaha OPN. The Mega Drive's VDP is almost entirely backwards compatible with that of the Master System — it implements the graphics mode used by all but one of the Master System's games natively*. So there's no emulation or translation, it's just a different graphics mode. Similarly the SN76489 is ...


3

The video circuitry was a lot simpler in those days and there was no true GPU as we have today. The video memory was part of the CPU memory space and any video circuitry merely converted it into a video signal. There was no graphics processing outside of what the CPU did. Some, particularly earlier systems use discrete components to produce a simple video ...


2

Broadly speaking, all these systems worked in the same way. The base system is always the same, generate the lines and synchronisation pulses needed to build display frames. The video circuit (could be a single chip or not) knows when it starts a single frame, and has somewhere access to memory (which can be private or shared with the microprocessor). It ...


2

A standalone processor, such as the ones you have listed, would usually only be able to perform some basic operations on integer data. This would typically be add and subtract because those operations can be trivially implemented with minimal amounts of logic (see Ben Eater's series on building a CPU on a breadboard as an example). Earlier versions of the ...


2

I've done my first shares of Genesis disassembly with Charles Doty's DISASM.exe. Please, note that you will need to run it in DOSBox.


1

Not really an answer, but... ...The phrase "co-processor," can mean two different things. When you're talking about a "floating point co-processor" or "FPU," you're probably talking about a chip that extends the capabilities of the main CPU. In a very real sense, it becomes part of the CPU when it is installed. It adds ...


1

If you object using non-demo ida pro, you can try Ghidra tool, which is much like ida pro (and not simply an disassembler!). It is open source and does support 68000.


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