Emulating Memory Access: How Hard Can It Be?

There are so many things we approximate to make life simple. Wires, for example, have no resistance or other strange effects. Crystal oscillators output their exact frequency.

Emulating Memory Access: How Hard Can It Be. But surely our model of how a computer stores and loads memory is accurate, right. You put data in a particular location and, later, you take it out.

The [FEX-Emu] developers have a different perspective. Once you have caches and, perhaps, multiple CPUs, it isn’t that easy. The basic problem is this: if one CPU (or, more accurately, bus master) writes to a location, will another CPU have access to the new value.