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# Hardware

# Machine types

* Von Neumman and the stored program
* Accumulator
* Stack
* Registers
* ISA
* Data, addresses and control registers

# Memory

* Buses
* Memory Cache
* Segmentation
* Paging and Virtual Memory
* Operation Reordering

# Interrupts

* Register saving
* Maybe different stack

# Supervisor mode

* Protected instructions
* Protected registers
* Traps

# Multi-processor systems

* SMP
* NUMA
* Memory coherency

# I/O

* Buses
* Different address space
* Memory mapped registers
* Device memory
* Shared memory
* DMA

# Operating System