[Coco] XPander-Coco lives!
zippster278 at gmail.com
Sun May 1 22:09:08 EDT 2016
Thank you Jim.
> On May 1, 2016, at 7:34 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
> On 5/1/2016 7:30 PM, Zippster wrote:
>> I’ll look into an open drain part, the MAX811 was just what I had on hand patching up the boards.
>> - Ed
>>> On May 1, 2016, at 7:25 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
>>> On 5/1/2016 6:13 PM, Zippster 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.
>>> I'd instead recommend an open drain supervisor, which are plentiful. They work the same as the MAX811, but the RESET output is open drain.
>>> Coco mailing list
>>> Coco at maltedmedia.com
> I put the following in my cart to buy:
> MIC803, which seems much cheaper than the MAX811 ($.22 versus $2.10 @100s)
> I chose a 4.38 device, but it appears MIC offers a ton of threshold voltages.
> RETRO Innovations, Contemporary Gear for Classic Systems
> Coco mailing list
> Coco at maltedmedia.com
More information about the Coco