Posted By
Csabo
on 2015-12-20
16:23:29
|  Re: unused I/O location for debug purposes
You're right gerliczer, it seems $FF20-$FF3D *is* usable when RAM is paged in (just as $FF40 and above - that's pretty common actually). But regardless, the correct answer is what siz said above, and of the bytes marked as free should be good.
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