[Coco] CoCo 3 MMU test for all

[Mark Marlette]

Roger,

I haven't been following this that close because it is something I do everyday.

As james has indicated, basic CoCo understanding of the CoCo's 
internal registers. A stock MMU is only 6 bits wide. 'AND' off the 
upper two bits, bit6 & bit7.

Go to a 1 meg machine and bit0-6 will be used.

Go to a 2meg machine and bit0-7 will be used.

256 blocks of 8k sized blocks = 2megs.

Mark
Cloud-9






At 1/20/2008 03:00 PM, you wrote:

>At 02:54 PM 1/20/2008, you wrote:
>>Roger Taylor <operator at coco3.com> wrote:
>>
>> > It also turns out that storing a 121 in 65441 under both VCC and MESS
>> > emulators returns the 121 back, even though a 57 is initially
>> > there.  This is good.  As long as somebody on the M.E.S.S. team
>> > doesn't go and try to mess this up for everybody, I can make a single
>> > LOADMable version of my extended size games with all components
>> > embedded and automatically stashing to specific MMU blocks in the
>> > CoCo while loading.
>>
>>How would making MESS more accurate be bad in this case?
>>
>>You should also really find out how a 2 meg upgrade will effect these
>>results.
>
>I caught what I said and it shouldn't matter, no.  It might even 
>clear up other problems?  Who knows.  Give it a try.
>
>Hopefully somebody with a 1 and 2-meg upgrade will post their 
>results eventually.  So far, 128k and 512k is behaving the same.
>
>
>
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