[Coco] An interesting Korean CoCo2 - 26-3134 (no 'A' or 'B')

[Brian]

On 11/15/2012 11:50 PM, Gene Heskett wrote:
> On Thursday 15 November 2012 23:47:30 Brian did opine:
>
>> I'm pretty sure
>> I'm looking at a 64k, ECB upgrade to what was once a 16k CoCo2 with
>> Color Basic. Are all of these other jumpers and the wire from ECLK
>> necessary for it to use a 128k (27128) EPROM?
>>
>> The machine does work, and other than this particular motherboard not
>> being very well documented, I don't think there's any great mystery - I
>> guess it's more of a curiosity thing. If I get the time over the
>> holidays, I may do a component layout of the board so at least that
>> exists.
>>
>>
>> Brian
> Brian:  Those 64k/128k markers are for rearranging the rom access, either
> for a 64k (64 kilobits, aka 8 kilobytes) or 128k=16kilobytes roms.  Nothing
> to do with how much memory is in it, which appear to be a pair of 64kby4
> bit rams, so two work side by side to supply all 8 bits.
> Cheers, Gene 

Gene,

Like I said, it was more of a curiosity issue with me since I did the 
math ((64 * 4)/8)*2)=64. Was more surprised by the board layout since it 
was completely different than the other two CoCo2s that I have, and 
there didn't seem to be much info available.


Brian