I am having difficulty emulating with a PIC16C74.  I am using a RICE16
emulator, and looking for a change in PORTB.  I have set INTCON to a hex C8,
and PB2 thru PB7 are setup for input, with weak pullups.  When I ground PB4,
the emulator processes the interrupt, but performing a read on PORTB does
not enable me to clear bit 0 of INTCON.  Can anyone help me with this problem?

If the input is transient, and returns to '1' immediately during the
interrupt there is no problem, but if the input remains at '0', difficulties
ensue.

Please Help

Thanks,

Bernie Gordon