Re: Accessing the C64 memory between 65xx chips operations.

From: groepaz_at_gmx.net
Date: Mon, 20 Apr 2020 10:30:22 +0200
Message-ID: <2055762.h6RI2rZIcs_at_rakete>
Am Montag, 20. April 2020, 10:24:32 CEST schrieb groepaz_at_gmx.net:
> Am Montag, 20. April 2020, 10:17:46 CEST schrieb Gerrit Heitsch:
> > On 4/20/20 8:58 AM, Pasi 'A1bert' Ojala wrote:
> > > On 20.04.2020 08:56, Gerrit Heitsch wrote:
> > >> On 4/20/20 2:29 AM, tokafondo wrote:
> > >>> I'd like to know what happens when the VIC gets disabled by software,
> > >>> just
> > >>> like when the CPU does when loading datassette programs the standard
> > >>> way. At
> > >>> least, it would refresh DRAM but do the rest of the memory access
> > >>> apply?
> > >> 
> > >> Yes, DRAM Refresh will happen and, as far as I know, VIC will continue
> > >> to do DRAM accesses to $3FFF but no longer do badlines.
> > > 
> > > VIC-II will still also perform sprite fetches for each active sprite.
> > 
> > Even while the display is disabled?
> 
> yes. you can also trick the VICII into disabling only the badlines, but
> still disable the sprites (toggle DEN in similar way you toggle 24/25rows
> to open the vertical border)

it should have been "still display the sprites", of course :=)


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Received on 2020-05-30 01:34:06

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