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для ЕХТ МЕМ интель пишет:
In either case, the low byte of the address is time-multiplexed with the data byte on Port 0. The ADDRESS/DATA signal drives both FETs in the Port 0 output buffers. Thus, in external bus mode the Port 0 pins are not open-drain outputs and do not require external pullups.
а для ИО верхний транзистор откл. - нужен пулап.
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