[Coco] CoCo 3 RAM upgrade question

[Boisy G. Pitre]

Blake,

The upgrade board you have is not the Cloud-9 512K SIMM board (I'm not sure what kind it is, actually), so i am hesitant to say clip C66.  I'll let Mark chime in, but I think you're safe in leaving C66 in place.

Best Regards,
Boisy G. Pitre

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On Feb 1, 2012, at 2:22 PM, Blake Patterson wrote:

> So, part of the haul of CoCo items I got in this recent package was a somewhat hacked up CoCo 3 bare motherboard with a 512K RAM expansion on it. I removed it and performed the upgrade to my main CoCo 3. 
> 
> http://www.flickr.com/photos/blakespot/6802978703/in/photostream
> 
> To figure out the drill I looked over at Cloud9 for instructions on their SIMM board. It said to pull the 4 existing RAM chips and clip the upper C64 cap and the lower C65 cap. I noticed on the CoCo 3 that this upgrade came from that the C65 (lower) cap was clipped, but not the C66 (upper) cap. This is contrary to the Cloud9 instructions, but perhaps it's a different drill for different boards?
> 
> The system powers up fine with the upgrade in it, but still I get just a few blocks read through DriveWire before it just sits there on almost every OS9 boot I perform using "DOS" command. Boisy thought maybe I was running out of RAM -- was hoping that things would be working now.
> 
> Do I need to clip that upper cap? Is the RAM not fully recognized? 
> 
> Thanks.
> 
> 
> 
> 
> bp
> 
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