>> For example have the ISR right at the bottom of memory, as some
>> people prefer. Then you'd have the main code following it, eg
>>
>> org 0x00
>>
>> isr code
>>
>> org 0x100
>>
>> main code

> Huh?

I didn't make it clear that those addresses are in program memory,
not at the vector addresses. I hope it didn't confuse the OP. Reference
was made to the memory map
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