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This is a photo of the connector

I have done continuity tests on the 3 pins.
1 is obviously ( from the continuity tests ) a ground pin. 1 is switched by the power switch. 1 has resistance and seems to change impedance when the power is switched on.

If anyone has any information on this connector, voltages and pinouts that'd be super useful.

Some extra pictures:

This is a custom ( I think ) board

Custom board? I think so based on the quality of the fabrication.

They pre-modded this to have an exposed swappable CMOS battery... but it's 6v?

They pre-modded this to have an exposed swappable CMOS battery... but it's 6v? The original I think was 3v.

Shot of full back w/ high density ports

Shot of full back w/ high density ports

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  • $\begingroup$ It's surely been modified for space use, so noone can help you except the guys who did the mods. You could use factory original 1530 as a reference to undo the mods, but I'm confident it would destroy its value as a space item. $\endgroup$ – Agent_L Aug 4 '16 at 8:59
  • $\begingroup$ I'd like to avoid disturbing the physical item, but restoring it to working order would be worthwhile. In addition pulling the software off before it bitrots is of even greater concern to me. $\endgroup$ – Matt Joyce Aug 4 '16 at 15:10
  • $\begingroup$ IMHO the safest way of pulling the soft off is to temporary move the hdd into another, operational computer. $\endgroup$ – Agent_L Aug 5 '16 at 9:46
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    $\begingroup$ That sounds a lot easier than it actually is. The HD is buried down deep inside the laptop and I am pretty sure I'd have to damage the plastic bolts to get it out. If I can avoid doing that, I'd like to. $\endgroup$ – Matt Joyce Aug 5 '16 at 14:42
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    $\begingroup$ I think every sign on earth and the sky says: get an unmodified 1530 and practice on it. $\endgroup$ – Agent_L Aug 8 '16 at 9:21
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The IBM laptops were flown unmodified and a special "brick" was used to convert the Orbiter 28 VDC to the regular power supply voltage and current used by the laptops. The "brick" is shown as DC PWR SPLY in this excerpt from the Orbit Ops Checklist. enter image description here

Grid dates from an earlier time but I doubt they modified anything but the connector. Do you have info on what a regular Grid used? If no, it looks like the company still exists, they might know. http://www.griduk.com

My roommate worked on these in 1983-1984 but I didn't know details.

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  • $\begingroup$ it says 16v dc on the back placard. $\endgroup$ – Matt Joyce Aug 3 '16 at 15:53
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    $\begingroup$ I could not find details on the "bricks" even for the late shuttle era. $\endgroup$ – Organic Marble Aug 3 '16 at 16:00
  • $\begingroup$ cantrip.org/leap/IDD-486.html <--- found some info on that thinkpad setup here. loathe to pump 28v into a socket labeled 16v without some sort of indicator that i should. $\endgroup$ – Matt Joyce Aug 3 '16 at 16:03
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    $\begingroup$ Looks like the "bricks" in that document took 28 vdc -> 20vdc. I def wouldn't put 28 vdc into yours. $\endgroup$ – Organic Marble Aug 3 '16 at 16:07
  • $\begingroup$ yeah. need to find more information on this 'emerald brick' $\endgroup$ – Matt Joyce Aug 3 '16 at 16:16
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I have an unmodified commercial GRiDCase 1520. The external DC connector is labelled 16V, and the output of the AC/DC convertor brick states that it is 16.25V. The GRiD Compass was the unit designed specifically for NASA/DoD use, the Case was a commercial product, and I doubt that they produced a significantly separate design for Shuttle use (though they have clearly added a more secure DC connector than the commercial barrel connector).

GRiDCase 1520 rear view, power brick removed GRiDCase 1520 power brick, inner connector

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    $\begingroup$ Does that glyph on the back with the broken and unbroken lines beside the "16vdc" tell you anything? (I am not a EE).... $\endgroup$ – Organic Marble Aug 3 '16 at 18:00
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    $\begingroup$ It means DC. Versus the waviness of AC. $\endgroup$ – Matt Joyce Aug 3 '16 at 18:02
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    $\begingroup$ @MattJoyce - given your photo, one of the mods they clearly made was a fan vent just left of the brick cavity. I assume this was to help with the well known issue, most prevalent on the Compasses, of the lack of convection cooling. It's not clear to me from your photo, but what is in the brick cavity in your model? Having said all that, it seems daft of MD to have changed the internal DC, whatever they did "externally"... $\endgroup$ – Grimxn Aug 3 '16 at 18:19
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    $\begingroup$ I can confirm that the GRiDs all ran extremely hot! We used them extensively (both Cases, and, originally Compasses) for portable marine navigation, and it was a GRiD salesman who first told me the story about the Compasses (which had no fan at all) overheating due to lack of convection in 0G... $\endgroup$ – Grimxn Aug 3 '16 at 18:32
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    $\begingroup$ ...sorry, I'm not skilled enough to disassemble the Case - it still works, so I am am not minded to hack away!!! $\endgroup$ – Grimxn Aug 3 '16 at 18:38
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That’s an MS3116 connector, used on US military equipment. If I had to guess I’d say it’s a size 8 shell. The tech specs are available on the Defense Logistics Agency website and everyspec.com, and connectors are available from DigiKey and Mouser.

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  • $\begingroup$ Might it be MS3476 instead? $\endgroup$ – JCRM Dec 2 at 9:08

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