Re: Vic problem

From: Terry Raymond <traymond20_at_gmail.com>
Date: Sat, 26 Sep 2015 11:33:47 -0700
Message-ID: <CAEFCF-pL2Ahsm59p3Xp9mDcjCxyTuuJZVcrfZwtV-Rm_HnZZiw@mail.gmail.com>
Well yes the key barely even responds.

On Saturday, September 26, 2015, Marko Mäkelä <msmakela@gmail.com> wrote:

> 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
>>>> greeting
>>>>
>>>
>>> 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 value.
>>
>
> 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.
>
>         Marko
>
>       Message was sent through the cbm-hackers mailing list
>


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Received on 2015-09-26 19:00:07

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