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A1000 DIP Agnus (also in first A2000 revision) has undocumented "bug", display field's first or last (depending on your viewpoint) strobe isn't vblank probe which causes vblank interrupt to trigger one line later than in any other Amiga model. (yaqube found this one)
Everything else (including DFF004/DFF006) works normally, only vblank interrupt gets delayed.
Not common technical info: Paula sets the interrupt when it sees first vblank strobe in RGA bus, not Agnus. Only "real" Agnus interrupt is blitter finished and that uses separate pin that connects to Paula.
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