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RE[3]: 65816 instruction set


The M65's CPU remains 8-bit, but makes it much easier to work with >64KB RAM, which is really the main benefit of the 65816 as well, which gave 16MB address space. With the 45GS02, you have 32-bit memory space via special ZP indirect addressing. I fully concede that the decision is a rather arbitrary one at some levels, as to what to add, and what not to add. However, there are architectural factors at play as well, such as the 4510 had no spare opcodes to make it easy to switch modes to 16-bit mode as for 65816.

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