[Coco] CoCo 3 memory expansion questions

[Neil Cherry]

On 2/2/19 5:19 PM, RETRO Innovations wrote:
> On 2/2/2019 4:02 PM, Neil Cherry wrote:
>> I've ordered the Boomerang board (with the buffer board) and I'm trying to
>> understand what I'm hooking up (for better documentation). Does anyone have
>> a Coco 3 schematic with the 2 memory connections? I'm trying to understand
>> what is connected to what. I think I can use the same board on my Sardis
>> ST2900 (a partial clone of the CoCo.
>>
> The 2 connectors bring out your standard 16 bit DRAM complement of signals:
> 
> RAS
> 
> CAS
> 
> D0-D15
> 
> ADDRESS0-ADDRESS8 (multiplexed, as DRAM addresses are)
> 
> WE0 (write to data 0-7)
> 
> WE1 (write to write to data 8-15)
> 
> +5V
> 
> GND
> 
> 
> I put a EAGLE library online with the connector pinout at:
> 
> https://github.com/go4retro/EAGLE_lbr/blob/master/coco.lbr
> 
> 
> Jim
> 

16 Bit RAM, interesting.

Thanks for the link to the lbr. I'll need a good look at that later.

-- 
Linux Home Automation         Neil Cherry       ncherry at linuxha.com
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