[Coco] Modern RS-232 solutions for the CoCo?

[L. Curtis Boyle]

If you look at the source code for Bruce Isted’s SACIA driver, some of the pin swaps DCD etc are documented in there, and have XMODEable settings to accommodate them (I think in the current repository this is now XACIA).

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>> I added the same functionality, but found a way to re-use some of the existing 6551 register bits to enable the higher bps rates, so the unit can still live within the same IO region as the existing RS232 and modem paks.
>> 
>> CMD also rewired DSR to the DCD input pin on the 6551, as I recall, to get around the issue that the 6551 will not transmit when DSR is low.  I think they also fixed an issue with CTS as well.
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> That, alone, would make me want one!
> 
>        — Allen
> 
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