DEC AXV11-C analog board

[Nigel Johnson Ham]

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
>