[Coco] Null modem cable carrier detect

[Alex Evans]

I believe that CD simply expects high and will treat +5 has high, so
you just need to tie CD to +5.

On Mon, Apr 15, 2019 at 8:56 AM Neil Cherry <ncherry at linuxha.com> wrote:
>
> On 4/15/19 7:52 AM, rietveld rietveld wrote:
> > Hi. Is there a way to mimic a carrier detect signal on the coco when using a null modem serial cable instead of a ‎real modem. I am trying to play checkers on two cocos using the cable instead of modems.
> > The checkers program seems to be waiting for this signal
>
> Pull the CD line to -12v (though a resistor), if it expects it high.*
>
> Build a debounce switch if it expects the  CD to bounce (high (-12v)
> then low (+12v).
>
> PS I think -12v is high.
>
> --
> Linux Home Automation         Neil Cherry       ncherry at linuxha.com
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> Author of:      Linux Smart Homes For Dummies
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