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When you start the simulation you will see the CPU with the program counter and the instruction register on the left of the screen, ROM on the right and the address bus (blue), data bus (green) and the control bus (red) in between. Refreshing the page, which simulates power-down followed by power-up, does not change the contents of ROM because ROM is nonvolatile. However, the data on the busses at this point is random. Step through the simulation by clicking on Next ->.
This simulation deals with one-byte instructions only. |
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Copyright (c) 2005-2013 James Rogers
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