What happens when processor is attending an interrupt if it gets another interrupt?

The response to another interrupt request during servicing of an interrupt depends on the setting of the interrupt enable flag and/or the interrupt mask. If the interrupt service routine is thread safe, it will process correctly. More probably, problems will arise so the proper procedure is to either set the interrupt mask (8085) to not allow this or lower priority interrupts before reenabling interrupt, or to leave interrupts disabled until this iteration is complete.

If interrupts are disabled or masked, a subsequent interrupt will be posted but not processed until the first is completed.