What was a Terminal Concentration Device in DEC's products?

[Chris Zach]

Maybe that is the dhv11. Or the dv11 I'll look it up tomorrow

On January 29, 2022 5:12:41 PM EST, Paul Koning via cctalk <cctalk at classiccmp.org> wrote:
>
>
>> On Jan 29, 2022, at 3:58 PM, Noel Chiappa via cctalk <cctalk at classiccmp.org> wrote:
>> 
>>> From: Paul Koning
>> 
>>> DH-11 is unusual in that it has DMA in both directions
>> 
>> McNamara's DH11? (I don't know of another DECdevice of that name.) Per:
>> 
>>  http://www.bitsavers.org/pdf/dec/unibus/EK-ODH11-OP-002_DH11_Asynchronous_16-line_Multiplexer_Users_Manual_Sep76.pdf
>> 
>> it's DMA on output only; the input side has a FIFO that has to be emptied by the CPU.
>
>Oh.  That's amazing, all these years I thought it had DMA both ways.  Clearly not.  I wonder how I got that misunderstanding.
>
>	paul
>

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