[Coco] CoCo 1 64K upgrade failed :(.

[Mike Pepe]

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.