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Old 06 September 2017, 19:06   #1
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What is this expansion board?

Hi all

I have just taken delivery of my new Amiga 2000... but in the process of "cleaning" it, I have managed to disconnect the two wires for the on/off switch on this expansion board. The problem is that I have no idea where they are supposed to go or what this card does.

Any ideas?!
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Old 06 September 2017, 19:12   #2
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Zorro II 8MB RAM:
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Old 06 September 2017, 19:48   #3
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Thanks...and this one?
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Old 06 September 2017, 19:53   #4
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That looks like a gvp scsi card.
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Old 06 September 2017, 20:09   #5
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With more memory?
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Old 06 September 2017, 20:37   #6
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Yep, that can also be fitted with 8MB of RAM... But you can only have up to 8MB in total, so you can't use both at the same time unless the total adds up to 8MB or less. I can't tell how much is actually fitted, but those 30-pin SIMMs are typically either 256KB or 1MB each. Perhaps the jumper settings (up near the RAM at the top of the card) might help determine how much is installed.
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Old 06 September 2017, 20:38   #7
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I have one of those 8-Up cards - there's no switch on mine. My guess is that a previous owner installed it to disable some of the RAM as needed.
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Old 10 September 2017, 21:46   #8
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Second pic is a GVP Series II HC8. Memory populates from the front edge of the card in pairs of 1MBx8 SIMMs. Jumper settings on all revision cards are identical, with 0/2/4/6/8MB settings (& all but earliest models have a 2x4MB SIMM setting for 8MB configuration, too) The memory in that second pic is in the slots, so maybe just a holding point. Benefit of using the GVP HC8 memory is DMA to onboard RAM is less intrusive to the CPU when the destination is that memory and the CPU needs to be busy elsewhere (OS housekeeping). If there was 8MB on the Supra card, then they probably disabled all the RAM on the GVP if they didn't have enough memory of that type.
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