Re: plus4 power supply

From: Gerrit Heitsch <>
Date: Fri, 21 Sep 2012 13:42:05 +0200
Message-ID: <>
On 09/21/2012 12:58 PM, wrote:
> BTW, Gerrit - what do you think was the point in providing two +5Vs in the 64? One called +5 and the other CAN+5? Looking at 252312-right, they dropped this idea on the narrow boards. But I am wondering why they introduced it in the first place.

There are 3 reasons I can imagine:

1) Power, 5V, 2A might have needed a different plug

2) Keeping the power for the VIC and clock generation seperate from the 
rest of the system to prevent RF noise from leaking. Remember, the first 
boards had the discrete PLL inside the can.

3) Providing the VIC with its own power source that doesn't contain all 
the noise from the rest of the system which might otherwise become 
visible on the screen.

I think it's a mix between 2) and 3). With the creation of the 8701, 2) 
became less important.


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Received on 2012-09-21 12:00:37

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