mak kini wrote:
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I am using pcf8574 for interfacing parallel printer to my 89S8252-based System. I am using printer STB line to strobe 7 bit data to write a character to printer.
But i am not looking for busy/ACK pin of printer since
I have only 1 pcf8574 for this purpose.

Would it be possible to use a port pin on the 89S8252 chip to monitor the busy line? The busy line is all you have to monitor. When there is a printer "error" (busy, paper jam, paper out, offline etc.) busy goes high.

Best regards,

Mikkel C. Simonsen