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One more thought. Probably silly, but make sure pin 31 (!EA) on S700 is grounded. It needs to be grounded so the MCU can read code from the external EPROM and not from its internal memory. There should be a jumper for this.
However this check is probably useless as your ECU has a 28-pin EPROM.
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Gilles
RoW 88 Carrera coupé
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