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geekhack Marketplace => Great Finds => Topic started by: nubbinator on Sun, 12 January 2014, 02:07:01

Title: Silicon Graphics Granite (AT-101) $54 shipped & interesting old Ketronic
Post by: nubbinator on Sun, 12 January 2014, 02:07:01

They have some sort of serial connector and come with a mouse attached, but they're interesting boards I don't see come up very often.  If they were a little cheaper, I'd grab one.

http://www.ebay.com/itm/Silicon-Graphics-AT-101-SGI-Keyboard-9500900-w-S100-Mouse-DB25-Connector-/221352696754?pt=PCA_Mice_Trackballs&hash=item3389a61bb2

http://www.ebay.com/itm/Silicon-Graphics-AT-101-SGI-Keyboard-9500900-w-S100-Mouse-DB25-Connector-/221352689734?pt=PCA_Mice_Trackballs&hash=item3389a60046

And the old Ketronic (sic?):

http://www.ebay.com/itm/NEW-OLD-STOCK-KETRONICS-COMPUTER-KEYBOARD-VINTAGE-/261372733041?pt=PCA_Mice_Trackballs&hash=item3cdb076671

http://www.ebay.com/itm/KETRONICS-COMPUTER-KEYBOARD-VINTAGE-/251423103202?pt=PCA_Mice_Trackballs&hash=item3a89fc18e2

I'm guessing it's an old Hall Effect switch.

Title: Re: Silicon Graphics Granite (AT-101) $54 shipped & interesting old Ketronic
Post by: blueSmoke on Sun, 12 January 2014, 02:22:59

I believe the first two are alps sliders and the last two are capacitive foil ones. These have a slider with a spring at top and foam+foil at bottom. not that great...

Title: Re: Silicon Graphics Granite (AT-101) $54 shipped & interesting old Ketronic
Post by: nubbinator on Sun, 12 January 2014, 02:28:55

I know for a fact that the first two are Alps, likely Cream Alps.  The next two, after closer inspection, probably are foam over foil.

Title: Re: Silicon Graphics Granite (AT-101) $54 shipped & interesting old Ketronic
Post by: AKIMbO on Sun, 12 January 2014, 06:50:54

The sgi boards are dampened cream alps. They look to be in great shape too. It's a shame about that cable.

Title: Re: Silicon Graphics Granite (AT-101) $54 shipped & interesting old Ketronic
Post by: dante on Sun, 12 January 2014, 10:18:30

Despite foam over foil the keycaps have more sex appeal than 99% of the mass produced crap shoveled today.

Title: Re: Silicon Graphics Granite (AT-101) $54 shipped & interesting old Ketronic
Post by: dorkvader on Sun, 12 January 2014, 13:59:10

Quote from: nubbinator on Sun, 12 January 2014, 02:07:01

http://www.ebay.com/itm/NEW-OLD-STOCK-KETRONICS-COMPUTER-KEYBOARD-VINTAGE-/261372733041?pt=PCA_Mice_Trackballs&hash=item3cdb076671

http://www.ebay.com/itm/KETRONICS-COMPUTER-KEYBOARD-VINTAGE-/251423103202?pt=PCA_Mice_Trackballs&hash=item3a89fc18e2

I'm guessing it's an old Hall Effect switch.

Highly doubt it: I have never seen a hall effect keytronic KB. Keytronic did make some reed switch keyboards back in the day (I have tried several). The cheapest reed switches you can get are old gilbarco panels that use them.

These two are both clearly capacitive. You can see the capacitive pads under each switch through the bottom of the PCB.

Title: Re: Silicon Graphics Granite (AT-101) $54 shipped & interesting old Ketronic
Post by: Hak Foo on Sun, 12 January 2014, 22:57:04

I'd warrant the SGI caps make a good swap for, say, an AT101W's ugly lasered caps... except for the bottom row :/

Title: Re: Silicon Graphics Granite (AT-101) $54 shipped & interesting old Ketronic
Post by: Findecanor on Mon, 13 January 2014, 00:19:04

Quote from: Hak Foo on Sun, 12 January 2014, 22:57:04

I'd warrant the SGI caps make a good swap for, say, an AT101W's ugly lasered caps... except for the bottom row :/

Why don't you use the SGI keyboard as it is? It talks PS/2. It has Cream Alps which many find to be much nicer than the Black Alps of the Dell AT101W.
If you don't like the granite case, chances are that the innards fit inside a Dell AT101.
Anyway, the "SGI Granite" is a bit of a collector's item and worth more complete.