Re: DRAM refresh

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Sat, 15 Oct 2016 18:49:45 +0200 Message-ID: <2f2fbdb0-0165-aea0-996e-ce35b4425252@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 10/15/2016 09:38 AM, Segher Boessenkool wrote:
> On Fri, Oct 14, 2016 at 12:33:24PM -0500, Segher Boessenkool wrote:
>> On Fri, Oct 14, 2016 at 12:39:09PM +0200, Gerrit Heitsch wrote:
>>> On 10/14/2016 12:20 PM, Hegedűs István wrote:
>>>> Yes. It was a surprise for me also. Indeed it rolls over inside the
>>>> visible screen area several times, however there is a forced clear in
>>>> scan line 0 thus the refresh is uneven. Some rows get more refresh.
>>>
>>> Now we only have to find out if VIC does the same which would mean they
>>> just took that block from VIC when making TED.
>>
>> AFAIR the VIC-II row counter for refresh is free-running.  I'll have
>> a look later.
>
> It is reset at the end of the frame, actually.

I wonder why they do that... Making sure that the counter can't get 
stuck somehow?

  Gerrit

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