At 15.53 18-03-1997 -0800, you wrote:
>Has anyone had problems with the IBF, OBF and/or IBOV flags getting set
>erroneously when operating the parallel port in polled mode (not using
>the PSPIF bit/interrupt) in the 16C64?
>
>I see the IBOV flag getting set when the host is reading the PIC's
>output register (in a polling loop), than when the host writes to the
>PIC, the new data is not transferred to the PIC's input register and the
>PIC ends up with the same data from the last legitimate write.
>
>thanks,
>Gary
>
>
There is the same or a similar problem with the 16C74 PSP which is described
in an errata sheet.  There might be one out for the 16C64 too.  Try to look
it up on the Microchip home page.

Regards
Michael