🚀 go-pugleaf

> 
> 	from the DEC communications handbook 81-82
> 
> 	The DUV11 is a 9600 baud single line, program controlled,
> double-buffered device designed to interface LSI-11's to a serial synchronous
> line. typical use was a synchronous line concentrator or a front-end
> synch. controller to larger system.  This is not a DMA device.
> 
> 	This is all pre-microvax so I would hesitate to try and configure
> it.  It is q-bus so it may be possible, but I'm not sure it was full 22-bit
> addressing at that time. I would leave it out.

We had a DU11 on a Unibus machine, this sounds like the Qbus equivalent, 
and the above description fits pretty well.  We used one on an RJ2780 emulator 
on RSTS/E (in conjunction with a KG11 CRC unit).  Because of its limited 
buffering, and the load on RSTS/E, we had some troubles with buffer overflow.  
I don't know, but I suspect the DU11 was invented *before* 22bit Qbus (ie 18 
bits)

Regards,

John Bennett                                E-mail: bennett@dstos3.dsto.gov.au
Head, Networks Group                        Phone : +61 8 259 5292
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