[Coco] XPander-Coco lives!

[Zippster]

In fact now that you bring this up, I think on mine, I’m going to test this with a bunch of different
CoCos here to make sure the system reset won’t be a problem.  Then implement what I
mentioned below here.  Great another revision.  I guess that’s why it’s called development. lol..

Thanks for bringing this up Jim, it probably saved me some trouble.

- Ed


> On May 1, 2016, at 6:13 PM, Zippster <zippster278 at gmail.com> wrote:
> 
> That’s a good point I didn’t give much thought to.  I know the reset switch works ok, 
> but that doesn’t mean something else would.
> 
> Since we’re working with a CPLD in the mix on these boards, I guess the reset
> signal to the cart ports could be routed through it, and used to toggle !MR on the MAX811.
> 
> Then I guess you’d need to read the status of the reset line (CoCo side) and forward that
> to the slots as well for a full system reset.  Complicates things a bit.
> 
> - Ed
> 
> 
>> On May 1, 2016, at 5:42 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
>> 
>> On 5/1/2016 5:38 PM, Zippster wrote:
>>> Hmmm, I would think so, but the MAX811 has a master reset on pin 3.  You can drive this low to activate reset as well.
>>> Glancing at the data sheet, consider !MR internally held high by the equivalent of a 10K pull up.
>>> 
>>> Are you wondering if a cart will be able to reset the system with the MAX811 in place?
>> Yep.  I think the supervisor is a great idea, but since RESET is a "wired or" type line, I think the device needs to allow others to pull reset low.
>> 
>> Jim
>> 
>> 
>> 
>> 
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>