Re: MMU prototyping

From: Jim Brain <brain_at_jbrain.com>
Date: Thu, 24 May 2018 21:40:52 -0500
Message-ID: <8f774cf3-e42f-04c8-6057-484d8b030d53@jbrain.com>
On 5/24/2018 4:47 PM, smf wrote:
> On 24/05/2018 18:38, Jim Brain wrote:
>
>> You would get exactly that.  All RAM except the 4kB at the bottom and 
>> the IO page would disappear. If you were able to configure this unit 
>> to replace the open space with RAM, the entire rest of the memory map 
>> would have RAM in place for all CPU cycles.
>
> If you have a load of ROM that can also be paged in, then it might be 
> quite interesting. It would get past the vic being hard coded to see 
> character rom at magic addresses.
There is a 512kB FLASH ROM on board.
>
> Obviously you'd want to port 3-in-1 software from the plus 4.
Obviously?

Jim
Received on 2018-05-25 05:01:45

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