[Coco] CoCo 1 64K upgrade failed :(.
lamune at doki-doki.net
Fri Sep 26 17:23:41 EDT 2008
Ryan Pritchard wrote:
> On further reviewing the Datasheets say 128 refresh cycles/2ms, so because
> it says so, I am not going to bother to understand the logic.
> On Fri, Sep 26, 2008 at 4:05 PM, Ryan Pritchard <coconut at pritchard.ca>wrote:
Only the columns are refreshed. Although it may look to the system like
a symmetrical "square" array, the array is actually "rectangular" in
many larger DRAMs.
So, logically, a 128 column 64k DRAM (they do exist) behaves physically
not like a 2 dimensional 8x8 array but more like an array that's 2x8x7.
kind of weird, yeah, but that's how they work- reducing the number of
columns makes refresh easier.
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