[Coco] 1mb and 2mb memory upgrades

[Hugo Dufort]

This page describes how it is possible to use the 2 upper bits for 
paging and accessing memory up to 8 mb.
http://www.geocities.ws/idezilla/CoCoZilla1/bb8mb.html

The whole (clever) scheme reminds me of the good old A20 Gate on the 
Intel 80286 systems. Though the Coco3 solution seems to work better... ;)


Hugo

Le 2015-03-13 14:14, Luis Antoniosi (CoCoDemus) a écrit :
> But how is it paged ? Since each page is 8K, the original coco3 uses only 6
> bits for the MMU register.
>
> One thing is putting 8MB other thing is making the 8MB full available for
> OS-9 to run any app without modifications.
>
>
> Luis Felipe Antoniosi
>
>
>
> On Fri, Mar 13, 2015 at 1:58 PM, Brian Blake <random.rodder at gmail.com>
> wrote:
>
>> On 3/13/2015 1:47 PM, Brian Blake wrote:
>>
>>> On 3/13/2015 1:46 PM, Luis Antoniosi (CoCoDemus) wrote:
>>>
>>>> 2MB is the maximum you can use in the MMU registers: 256 x 8K
>>>>
>>>> Luis Felipe Antoniosi
>>>>
>>>>
>>> Someone forgot to tell that to Paul Barton....
>>>
>>>
>> For example...: http://www.reocities.com/idezilla/CoCoZilla/8mb.html
>>
>>
>>
>>
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>>
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