DEC AXV11-C analog board

[Douglas Taylor]

Yes, I have a couple of those and they are very close to the AXV11-C, 
except for the D/A.  They have a similar method of working.   The A/D 
modules look 'identical' but I am suspicious that there are variations 
of these modules that aren't readily apparent.

On 2/6/2022 12:26 PM, Nigel Johnson Ham via cctalk wrote:
> Now that I have thought a bit more, I think it was the DT2762
>
>
>
> The board was made by Data Translation.  There is an identical board 
> sold by them, in the DT2x6x series but I can'r remember the exact number.
>
> Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
> Amateur Radio, the origin of the open-source concept!
> Skype:  TILBURY2591nw.johnson at ieee.org
>
>
>
> On 2022-02-06 12:20, Douglas Taylor via cctalk wrote:
>> I have one of these and would like to use it, however it appears to 
>> only partially work.  Here is what I have found that works and what 
>> doesn't:
>>
>> 1. CSR and DBR are present and operational.
>>
>> 2. Jumpers set to 'factory'.
>>
>> 3. D/A portion works, can deposit codes in ODT and see voltages out 
>> on DAC pins that change depending on the octal value deposited in 
>> CSR+4 or +6.
>>
>> 4. A/D portion returns full scale code, either 3777 (2's compliment) 
>> or 7777 (offset binary) whether in the input is open or shorted to gnd.
>>
>> I think the problem is that the A/D inputs are not exactly protected 
>> and damage has occurred to this portion in the past.
>>
>> Does anyone have any info on the A/D module?  Who made it?  Can you 
>> open it up?  Does XXDP have a test for this?
>>
>> Doug
>>