[Coco] Coco 3 Memory Map Questions

[Dave Philipsen]

So I suppose to find out you could write a little m/l program and probe 
pins 7, 10, 11, and 12 with a 'scope.  Or maybe someone out there has 
already done this....

Dave


On 2016-02-08 15:51, Darren A wrote:
> On Sun, Feb 7, 2016 at 8:05 PM, RETRO Innovations wrote:
> 
> 
>> Looking at the schematic, other items that makes me wonder:
>> 
>>  * It looks like to save 1 pin on GIME, Tandy brought out S0,S1,S2
>>    select lines to a '138 to select 4 different IO spaces (SCS, CTS,
>>    ROM and the two PIAs).  I wonder if the other 4 select lines are
>>    decoded to some spot in memory.
>> 
> 
> 
> GIME S2..S0:
> 
> 000 = Internal ROM
> 001 = CTS*
> 010 = FF0x and FF2x  (PIAs)
> 011 = FF1x and FF3x
> 100 = Internal SCS*  (for possibly planned on-board floppy controller)
> 101 = ???
> 110 = External SCS*
> 111 = RAM ???
> 
> 
> - Darren