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From the A500+ service manual (talking about the 8375)
"In the 1 meg configuration, A19 is still used to determine the RAS line to be asserted. If A19 is low RAS0* is active and if high RAS1* is active"
I suspect the predecessors of 8375 work the same way.
In (unmodified) R5 and R6A A500s CPU's A23 is routed to Agnus' A19 via JP2. In (unmodified) R8a A500+s CPU's A19 is routed to Agnus' A19 via JP2.
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