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Whats different on the Lisa 1 I/O board?

different LISA o
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Whats different on the Lisa 1 I/O board?

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The Lisa 1 uses two 860KB 5.25″ Twiggy drives instead of the Sony 3.5″ 400K drives. When Apple provided the upgrade from Lisa 1 to Lisa 2, resistors R41 (3.3KOhm) and R47 (1KOhm) were cut on the I/O board, the I/O ROM was changed from version 40 to version 88.

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