deskthority

And for '93, check if 'numpad -' works... if it does, there's a trace coming from the controller through there and on to the other ones that don't register; just worn through between NUM- and the arrows in that case ;)

For the 1993 'board, everything is working except those keys I listed. I guess ...

off wrote:Well grats on fixing 1994!

Thanks! And thanks for the advice, you guys saved me a lot of time.

To finish that one off, here is the fully working and cleaned up 'board

It seems that your 1994 keyboard have a problem on J3.7 meanwhile the 1993 one have a problem on J3.8
Try to search in that direction :idea:


nfc

I had a quick look this evening, and a visual inspection of the 1994 'board tells me that the exposed conductor on the track that connects with J3 ...

Thanks, off and nfc. This is very valuable advice! I haven't made any progress yet, but hope to find some time this weekend.

ps, should be so much easier if you have something like a multimeter (continuitymeter) available to you, even without dismantling the board any further, finding someone's traced matrix will be semi-necessary though ;)

I do indeed have a digital multimeter. I'm hunting down the trace matrix ...

How did you clean the casing? I put one in the dishwasher once and even at only about 55 degrees it got badly warped. :/

I used some multi-purpose kitchen cleaner (Cilit Bang) diluted in a bucket of hot water, and scrubbed it with a sponge. Some low-abrasive Scotch Brite rubbing was need for the ...

the following keys don't register: 'B' ' N' '?' 'Alt Gr' the spacebar and the left, right and down arrows.
Sounds like a single trace to me.. No clue on IBMs whatsoever, but these keys are so in line with eachother that a single trace seems very likely- so it could be cut somewhere, or just not ...

I got three sold-as-seen Model M's back in March, as I reported here: http://deskthority.net/keyboards-f2/mcdonnell-douglas-anyone-know-anything-about-them-t2316.html?hilit=douglas .

First, I decided to clean up the working one, missing its external birthday label. It turned out to be a Jan 1988 ...

Embitterment? Nice vocab!
Good Game Guys.png

I also got some nice formal English, with random use of capital letters and strange spelling :-)

In reply to my request to collect in person and pay in cash, I got back:
"off-coarse You May Collect These Items, Cash On Collection is amicable as This ...

Wow. Sounds like an Aladdin’s cave! You seem to have done really well out of it, even accepting the dead keyboard. That would make a good parts mule if nothing else. You must have a bigger place, or a more tolerant woman in your life, than I do; I’d be thrown out of a second-floor window if I ...

I got three PS/2 Model M's from this seller. I picked them up in person, since I live very near Milton Keynes.

The ebay account holder and the vendors are not the same people. From the language, I'd say the ebay account belongs to someone educated in Africa. The vendors are a couple clearing out ...