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Tandy CoCo 1 Crashes Randomly


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On 11/23/2022 at 1:00 PM, MrDave said:

I would say its not a good ram to use

I am not a expert on the coco1.. but some of those old ram chips used 3 voltages   12v -5v  +5 v

This one was modded to support 4164 chips that used +5. I did some reading and as long as pin 1 is connected to ground it will be fine.

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On 11/26/2022 at 8:59 AM, MrDave said:

Can you measure the voltages on the ram socket 4 corners ?  And yes the main caps have to be good as it changes ac to d c voltage and uses thoose caps to smooth out the power .

All the voltages are in the 5% range the service manual says.

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