Re: Vic problem

From: Marko Mäkelä <>
Date: Sat, 26 Sep 2015 19:09:39 +0300
Message-ID: <20150926160939.GB10340@x220>
On Sat, Sep 26, 2015 at 05:49:55PM +0200, Gerrit Heitsch wrote:
>On 09/25/2015 12:26 PM, Marko Mäkelä wrote:
>>>This NTSC Vic when powered up takes a little longer to display the Rom
>>This is also normal. I suspect that it is holding the RESET line low
>>longer than the C64 does. Because of this super-long delay, my Vic Flash
>>Plugin firmware skips the RAM check, to get the start-up time somewhat
>>at par with the C64.
>The VIC has nothing to do with the RESET signal. It doesn't even have 
>a RESET pin. The timing of the RESET signal it controlled by one side 
>of the 556 timer and a few resistors and capacitors. If it takes too 
>long for your taste you will have to replace a resistor with a smaller 

I meant the 556 circuit. I think that the one in the C64 uses a somewhat 
shorter delay than the one in the Vic-20 (or VC-20). I thought that the 
"NTSC Vic" was referring to a whole system, not the 6560-101 VIC chip, 
which IIRC indeed is not even connected to the RESET line.


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Received on 2015-09-26 17:00:07

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