Re: Guru Meditation Exact Visual Specs

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Sat, 13 Aug 2016 11:33:59 +0200 Message-ID: <94fe64fd-4a12-0183-fc1e-5bbded3a738b@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 08/13/2016 10:22 AM, smf wrote:
> On 13/08/2016 06:51, Gerrit Heitsch wrote:
>> You could still switch by software though. I think the pin was needed
>> for Vbb.
>
> Yes you can still switch via software, I said "PAL and NTSC specific
> versions" not "fixed to PAL or NTSC".
>
> Vbb (which I think is for the back bias generator) rings a bell. I don't
> know why they needed it and earlier ones didn't.

The only explanation I can come up with would be higher yield if Vbb was 
buffered by an external capacitor.

Someone said that Commodore was maybe the first company to use this 
trick and by now it's standard in the industry.

  Gerrit

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