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Are old 65C816s TTL compatible? If their Vih is 2.0v, they are certainly TTL-compatible. Was there some kind of change? All WDC chips seem to be verilog-reimplemented, so when they synthesized them into netlist, they've intentionally dropped TTL-compatibility of IO-pins. The reason for that might be the need to have chips working in 1.8V..5.0V range (...


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