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No jumper setting is required to detect the size of any ram memory (up to 128 MB).
The 2 jumpers are for:
a) 60 ns / 70 ns speed memory
b) to move kickstart ROM to RAM memory. Your Amiga will be about 5% faster losing 512 KB RAM.
A PDF manual for the Blizzard 1230/IV should be available somewhere.
I fear the RAM your Amiga detects is the real size. Sorry.
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