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I cursed the lucky Rev6 owners too back in my day, but thankfully soldering that jumper wasn't such a big task afterall (I was twelve when I installed 2.04 in my old A500).
Before rev6, there were no 512kB ROMs envisioned yet and the commodore people got wrong info on the location of the uppermost address line (which was unused in the 256kB chips). This was fixed in rev6 onwards.
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