Re: Independent CPU/VIC-II setup

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Sat, 29 May 2021 22:08:58 +0200 Message-ID: <96e28b6d-171e-c8f9-dda8-48449ac8aaed_at_laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 5/29/21 9:26 PM, Spiro Trikaliotis wrote:
> Hello,
> 
> * On Sat, May 29, 2021 at 12:37:29PM -0500 tokafondo wrote:
>   
>> The idea is to have 64K of memory exclusive to the VIC-II mapped into the
>> memory address of the '816.
> 
> Adding to what Jim already wrote: Please be aware that the VIC-II can
> only address 16 KB of RAM without help.

But it will generate multiplexed addresses as if they were for 64 KB and 
will also generate a 256 cycle Refresh. So you need to supply 2 more 
bits and best would be to demultiplex everything and go with SRAM since 
then you can implement your own access timing easier as if you were 
using DRAM.

  Gerrit