You can examine with the Bit instruction right after putting the little bit mask in A, or read through the chip's standing sign up into A and use the AND instruction. So if the VIA's status register's bit 7 is set, you know T1 timed out. The 6502 and all its variants electricity up with the interrupt disable bit (I) established, this means the processor will never at first reply to anything at all that pulls the IRQ line small.
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