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

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Mon, 20 Apr 2020 07:56:32 +0200 Message-ID: <5435ca9e-39f5-a024-65cb-5364d6cd2e64_at_laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

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.

The only video chip I know from that time that really does free the bus 
when it doesn't need it is TED in the 264 series. It will then also 
double the CPU clock during that time.

   Gerrit