[Coco] MMU testing utility

[Barry Nelson]

Enable the mapping as per the doc? Those are the defaults, they should be enabled at boot. Are you trying to set all the registers, or just a few you want to change to test things? What exactly is “CoCoMEM”?

> On Sep 22, 2017, at 1:56 AM, Jim Brain <brain at jbrain.com> wrote:
> 
> On 9/22/2017 12:48 AM, Barry Nelson wrote:
>> From Extended Color BASIC 2.0 you should be able to poke values into the MMU registers and then read the memory and see the results. If you poke in a value that maps into the video display you should be able to see the memory contents on the screen.
>> 
>> http://www.lomont.org/Software/Misc/CoCo/Lomont_CoCoHardware.pdf
> I am trying that, but as soon as I try to enable the MMU functionality in CocoMEM via BASIC and setting up the registers as per the doc, the mappings goes all wonky and BASIC disappears. Obviously, I have bugs in my MMU code, but can't move forward without some simpler debug code.
> 
> Jim