> On Jan 29, 2022, at 12:28 AM, Chris Zach via cctalk
> wrote:
>
> Old question: I'm looking through some old reports from 1977 about a failed
> DEC project with the DMX11 multiplexer system and there is reference to the
> following key items:
>
> 1) The DMX was designed to handle block mo
> 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
> On Jan 29, 2022, at 3:58 PM, Noel Chiappa via cctalk
> 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_DH1
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
wrote:
>
>
>> On Jan 29, 2022, at 3:58 PM, Noel Chiappa via cctalk
>> wrote:
>>
>>> From: Paul Koning
>>
>>> DH-11 is unusual in that it has DMA in both directions
>>
>>
http://www.bitsavers.org/pdf/dec/qbus/EK-DHQ11-UG-002.pdf
DHQ11 User Guide, EK-DHQ11-UG.002
The main application of the M3107 DHQ11 is for interactive terminal
handling; it can also be used for data concentration and real-time
processing. It has two programming modes, DHV11 and DHU11. The
register
