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What is at FEA0..FEFF on a GameBoy device?

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Mateusz Viste

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Aug 29, 2010, 1:04:06 PM8/29/10
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Hello,

Not sure if that this group is still alive... Let's see :)

Does anybody know what is at address FEA0..FEFF on a GameBoy's memory?
All documentation that I read is stating that this range is "empty but
unusable for I/O".. What does it exactly mean? Can it be used as regular
RAM memory?

Best regards,
Mateusz Viste

Mark McDougall

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Aug 30, 2010, 6:11:45 PM8/30/10
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On 30/08/2010 3:04 AM, Mateusz Viste wrote:

> Not sure if that this group is still alive... Let's see :)

It's pretty much dead. :(

> Does anybody know what is at address FEA0..FEFF on a GameBoy's memory?
> All documentation that I read is stating that this range is "empty but
> unusable for I/O".. What does it exactly mean? Can it be used as regular
> RAM memory?

I don't know the answer - I'd suggest you find the source to one of the
gameboy emulators and deduce the answer from there.

Going off the description, I'd guess that no - you can't use it as memory.
What is probably means is that there is no RAM, no device, and no I/O mapped
to that address range. So when that address goes out on the CPU address bus,
nothing responds, so you'll just get rubbish back.

Regards,

--
| Mark McDougall | "Electrical Engineers do it
| <http://members.iinet.net.au/~msmcdoug> | with less resistance!"

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