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Joint Photographic Experts Group Image  |  1999-12-01  |  145KB  |  700x906  |  8-bit (256 colors)
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OCR: for a number of cycles would either require many transistors or are too easily disabled. Instead, we recommend simply not providing a program counter that can run over the entire ad- dress space. A 16-bit program counter can easily be replaced with the combination of a say 7-bit off- set counter O and a 16-bit segment register S, such that the accessed address is S + O. Instead of over- flowing, the offset counter resets the processor after reaching its maximum value. Every jump, call, or re- turn instruction writes the destination address into S and resets O to zero. The processor will now be completely unable to execute more than 127 bytes of machine code without a jump, and no simple FIB Figure 8: The interrupted white line at the bot- edit will change this. A simple machine-code post- ...