HP 9000-236 (9836CU) video cable.

[Robert]

Thanks, chaps.

Tony: That pinout is great, many thanks! It will help me if I have to
build a cable.

I don't suppose that there's a part number on yours? If there are any
for sale the p/n might help me find one.

Rico: If I have any HP-UX it will be on one of several SC80 hard
drives - I have no removable media. I don't know about the 200 series
- my 9816 has no keyboard and I haven't even begun to think about
solving that problem.

Robert

On Tue, May 22, 2018 at 12:07 PM, Tony Duell <ard.p850ug1 at gmail.com> wrote:
> On Tue, May 22, 2018 at 5:56 PM, Robert via cctalk
> <cctalk at classiccmp.org> wrote:
>> My latest score is an HP 9836CU (so, color with a 68010 CPU and HP-UX
>> support) with a 98625A disk interface. I got the matching monitor, but
>> I didn't get the video cable.
>>
>> Googling turns up that it's a very proprietary interface, but I could
>> find nothing about the cable. It's a 15 pin D-sub at each end and I'm
>> hoping that it's just straight through, but have been unable to verify
>> that.
>>
>> Does anybody know? Or Is there anybody that has a 9836C or CU and
>> would be willing to examine the video cable, please?
>
> The original cable has moulded connectors so I can't examine the
> internal wiring.
>
> It _is_ straight-through electrically, but there is a catch. There are 3
> coaxial cables (and some plain wires) in there. The coaxial cables,
> I guess 75 ohm characteristic impedance, carry the video signals.
> They seem to be wired :
>
> Red : centre to 12, shield to 13
> Green : centre to 10, shield to 2
> Blue : centre to 9, shield to 1.
>
> The other pins are, as far as I know, plain wires. There is probably
> an overall shield, grounded to pin 8
>
> The pinout, AFAIK, is :
> 1 : Blue shield
> 2 : Green shield
> 3 : ground
> 4 : ground
> 5: N/C
> 6 : ground
> 7 : +12V (computer to monitor, to cause the latter to turn on)
> 8 : ground (overall shield?)
>
> 9 : Blue
> 10 : Green
> 11 : HSync
> 12 : Red
> 13 : Red shield
> 14 : VBlank
> 15 : VSync
>
> Syncs and blanking are TTL levels, the video signal are current
> (not voltage) levels, sourced by the monitor and sunk by the
> computer.
>
> -tony