Re: VIC-II cache corruption

From: Segher Boessenkool <*segher_at_kernel.crashing.org*> Date: Mon, 21 Oct 2019 19:43:19 -0500 Message-ID: <20191022004319.GH28442_at_gate.crashing.org> · segher_at_kernel.crashing.org

On Tue, Oct 22, 2019 at 01:48:25AM +0200, Mia Magnusson wrote:
> Den Sat, 19 Oct 2019 17:28:18 -0500 skrev Segher Boessenkool
> <segher_at_kernel.crashing.org>:
> > On Sat, Oct 19, 2019 at 06:01:56PM +0200, Michiel Boland wrote:
> > > Apparently the VIC-II video chip has a 40x12 bit cache (I guess it
> > > is a sort of built-in SRAM) to store the current row of 8-bit
> > > characters along with 4 bits for color information.
> > 
> > Yes, it's a simple SRAM, 40 words, 12 bit each.
> 
> Are we 100% sure that it isn't made like DRAM? The data only has to
> survive for the length of 7 scan lines which seems to be short enough
> to fit even older DRAM technology. 

Yes, it's SRAM, 100% certain.  We have pictures, just look at it :-)

Segher