deskthority

Seller, I'm still interested in ABP151430. I am a serious bidder, but I do not want to overpay. The highest legitimate bid I saw for it was 5,69 euros. So I would like to bid 5,70 euros.

Please update the OP with the current bid on that keyboard so I can evaluate my finances if I am outbid.

Edit ...

@seller I think I'm past raoulduke-esq's max bid. Please add me to the OP.

For reference it's 5,27 euro for ABP151430

TYVM


I'll offer 5,29 euros for ABP151430

It's times like this where I sometimes wonder: Where do we Come From? What Are We? Where Are We Going? Why has a keyboard somehow ...

@seller I think I'm past raoulduke-esq's max bid. Please add me to the OP.

For reference it's 5,27 euro for ABP151430

TYVM

I just checked under my couch cushions and now I could go up to 5,18


I just found out I can con one of the undergrads to clean this for me, so I can definitely do 5,19
As you know undergrads time are worth about 0,003 euro an hour.


I just did something I’m not proud of in the metro ...

I can bid 5.13 euros on it, but only because I will be saving on shipping since I'm getting '0026 as well.


You drive a hard bargain but it's clearly worth slightly more.

But I just looked up the dollar to euro exchange rate on paypal and it's not great.

I bid 5,17


I just checked ...

I think I could get it done in only about 4:55 so I'll bid 5.05 euros for it


I'll up to 5,10 euros. Since there's two of us bidding in this range, it's clearly not worth much.


I can bid 5.13 euros on it, but only because I will be saving on shipping since I'm getting '0026 as well ...

5 euros for that ABP151430
I used to have one of these in 2012 and I sold it for about that since nobody wanted it. The one you have looks like it'll take about 5 hours to clean it up so it's usable so the offer price is adjusted to reflect that.


I think I could get it done in only about 4:55 ...

Regarding ABP151430.

I'll raise my offer to 5.02 euro.

I think I want it slightly more but still only a little.

5 euros for that ABP151430
I used to have one of these in 2012 and I sold it for about that since nobody wanted it. The one you have looks like it'll take about 5 hours to clean it up so it's usable so the offer price is adjusted to reflect that.

I looked into the side mount tactile switch that Findecanor recommended. Most pin headers plastic standoffs are 2.5mm tall, so you have that much space between the two. That's enough space for a side-mount tactile switch like this one:
https://www.mouser.com/ProductDetail/Panasonic/EVP-AKE31A?qs ...

Some great responses so far from everyone! Thanks so much for the feedback.


I was thinking more in SMD leds with their smd resistors, through hole would be a little bulky and it's not that hard to solder a couple of SMD components. Can be both things at the same time really, simply putting the ...

I would add on one or maybe both sides of the board pads for on-board lock leds, with the same spacing as the regular model M leds.

That way, add a case and a legend sticker and you can get a more compact version of what I use for my F/M-122's.


lock leds.png


Mine is just a regular off-white ...

First of all, nice job! :)

Sincerely a case would be my top request. Long time reliability depends from that, and if you want to use it at work you need plausible deniability.

Then:
- reset button
- more onboard memory (additional keymaps etc)
- add a keycombo that outputs the current date ...

Cool, all it needs now is an enclosure. I'm assuming with this type of adapter you wouldn't have to turn off your PC in order to connect and use a PS/2 keyboard?


I wouldn't say it "needs" an enclosure. Those are expensive. ($2-$4). If you go that route you don't really need the PCB anymore ...

Hi all,
I realized one week that I had given out or sold all my USB to PS2 adapters. Since the "good" ones are expensive I looked at the DIY route and it's actually pretty cheap ($11).

The PCB is basically a carrier for a PCB-mount PS/2 connector and an arduino pro micro. Below is a picture of the ...

Hi Slom and lessthanzero. Thanks for posting the explanations. I've been busy being a full time student (18 hours of classes, so I spend at least 12 hours every day including weekends on schoolwork) so I haven't had any time to test anything but I did sign up for a C class to help me understand the ...

Keep up the good work! I will now (once again) try to understand that demux part of your writeup ... I'm a software guy after all and that is above my head for now ...
I took logic design at my university last semester so I can help here. But first a datasheet:
http://ee.hawaii.edu/~sasaki/EE260 ...

Still getting some errors with the layout. I think I'm going to see if I can figure out how to compile your source code into a hex file and play with the key assignments myself.

In other news I reverse-engineered the entire circuit Here's the schematic for most of it. Missing are two components ...

Awesome news awesome, I will check the source I can fix the function row I just used the standard f-alphs as placeholders while I was debuging and forgot to replace them. The switch which corresponds to 6 numpad is broken on my board so I never set it. I can update the hex in the morning I just ...

Just count how many possible spaces there are on the keyboard I used 128 which is just the rows and cols with keys. But I think the whole board has 6*24 or 144 possible key posistion. So just change the array size which is
static const KeyInfo Keys[128] PROGMEM = {

Just change 128 to 144 or ...

It's really odd how my two texscan MSI boards have minor differences between them. the "master" board uses the buzzer and the second output of the 75451 and does not have the optocoupler populated, whereas the "slave" board has the inputs of that 75451 channel bridged (doing nothing) and the buzzer ...

What I really like (or hate) about these hall effect boards is that they're all different. This one is an excellent example of one that looks like it was modified after the PCB was printed. I mean, look at all those capacitors on top of the pull-up resistors. Mine has a ground lead that's soldered ...

Hey cool! thanks for the PM. I have this exact KB. I only had time to skim this before bed but I'll read it in depth and have a look at maybe getting mine worked on.
This is something I've noticed on several MicroSwitch boards the open parenthesis is placed over the eight and the close parenthesis ...

I don't see my old pictures still up on my archives, and the current photos are terrible, so I will reshoot new photos of this piece tomorrow.

Awesome for finding the manual. This keyboard actually has no controller, but instead there are logic gates up above the switches. I had reverse-engineered ...

Hey guys, I have been able to confirm slom's results with my copy of the board he used (from a silent 700). If Pin1 is VCC, pin 2 is output pin3 is what I'll call output control and pin4 is ground. When connected to power, output control pin shows about the same as vcc and pressing the switch ...

I completed a proof of concept today, connected two drive columns and one sense row...



Nice work! Great to see progress like this - hope you have time to continue with it!

I completed the conversion yesterday (safe for the mechanical toggle switches and the LED):
https://deskthority.net ...

I'm surprised though how many keyboards did use the 3-pin SD series switches. Originally I thought it was some cheap option that came along later, but it seems even the Space-cadet keyboard is 3-pin, based on the part numbers. That's assuming that we are understanding the part numbers correctly, as ...

Another option would be to connect switches to demultiplexor or PISO shift register.
Or just dedicate it's own GPIO pin to every key :)
https://www.mouser.com/ds/2/308/NLHV4051-D-1107585.pdf - 8-channel demux, 25 cents @100
That would work, but has a delay of 600 nS max (at 5V)! The gamers are ...

Wow, nice detailed write-up. I haven't gotten involved in the "under-the-hood" stuff like this, but I'd like to someday when I have the time to devote to it.

I think you have a typo here, or I really need some further explanation ;D :
The reason this is the case is because each switch is an ...

Cross post from Geekhack https://geekhack.org/index.php?topic=93775.0
Hi all, I've been getting some questions about hooking up hall effect keyboards so we can actually use them. Here is an explanation of two ways of doing sensing. Method #1 is 2KRO and #2 is NKRO. Both have their advantages ...