🚀 go-pugleaf

In article <1993Jan11.160754.1011@dragon.com> cts@dragon.com writes:
> I have various MicroVAX II systems with Telebit worldblazers attached.
> Currently, these are using DHV11 interfaces, which top out at 19.2 kb.
> It appears this is the bottleneck;  what options exist for getting faster
> speeds on an MVII, if any?
> 
> The top speed of the DHV/DHQ/DZQ appears to be 19.2;  the only board
> that's 38.4 capable for the Qbus is the CXY08, and it looks like this
> board isn't supported on the MVII.
> 
> Any suggestions?  I've considered getting a DLV11-J, and adapting the
> driver from the decus tape;  however, I'd rather have a DMA capable
> device....
> 
>   Charles Smith
>   cts@dragon.com
> 

There have been some Q-bus multiplexors (from Emulex and possibly others)
that support 38.4K when the OS sets the speed to some little-used value
like 2000 baud.  Bear in mind, though, the the VMS terminal driver doesn't
have terrific throughput, and you probably can't support streaming 38.4 K
on an MVII.

The fact that the VMS driver doesn't support RTS/CTS handshaking is another
drawback to high-speed transfers.  The WorldBlazer will do XON/XOFF, but
somewhat less efficiently.

I see (looking back) that I'm assuming that you're using VMS.  If you're
using UNIX, your mileage may vary.

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