I have a new design that uses P89C668. I want the capablitiy to program my device with FlashMagic. Right now, my design provides RST, PSEN, TXD, RXD, VCC, and GND to a 6pin header. This header will than connect to a custom cable that will have a RS232 transceiver, along with the other circuity describe in Application note 1 Figure 1. However, I am assuming that the states of P2.6, P2.7, ALE, and EA, are no longer relevant to enter ISP mode. Is this true?
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