> On Jun 18, 2020, at 2:14 PM, Peter Coghlan via cctalk <cctalk@classiccmp.org> 
> wrote:
> 
> ...
> As I mentioned in another reply, I have a pair of baseband synchronous modems
> and were it not for a speed incompatibility between them and the MicroVAX
> synchronous serial interfaces I have access to, ...

I'm curious about that.  Synchronous modems supply the bit clock to the 
interface.  So a synchronous interface works at whatever speed the modem 
delivers, so long as it's not too fast for the interface. What are the Microvax 
sync interfaces you have?  DMV?  DUV?  A DMV will work at up to 56 kbps.  

        paul

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