Search found 329 matches

by dorkvader
10 Sep 2020, 18:08
Forum: Workshop
Topic: PS/2 to USB adapter PCB
Replies: 16
Views: 736

Re: PS/2 to USB adapter PCB

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=EU6...
by dorkvader
07 Sep 2020, 16:57
Forum: Workshop
Topic: PS/2 to USB adapter PCB
Replies: 16
Views: 736

Re: PS/2 to USB adapter PCB

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 holes...
by dorkvader
06 Sep 2020, 04:21
Forum: Workshop
Topic: PS/2 to USB adapter PCB
Replies: 16
Views: 736

Re: PS/2 to USB adapter PCB

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 project...
by dorkvader
05 Sep 2020, 17:03
Forum: Workshop
Topic: PS/2 to USB adapter PCB
Replies: 16
Views: 736

Re: PS/2 to USB adapter PCB

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 (impossi...
by dorkvader
04 Sep 2020, 18:15
Forum: Workshop
Topic: PS/2 to USB adapter PCB
Replies: 16
Views: 736

Re: PS/2 to USB adapter PCB

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, just ge...
by dorkvader
04 Sep 2020, 16:49
Forum: Workshop
Topic: PS/2 to USB adapter PCB
Replies: 16
Views: 736

PS/2 to USB adapter PCB

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 f...
by dorkvader
23 Sep 2018, 00:41
Forum: Workshop
Topic: Man vs MicroSwitch: Converting a SD16234
Replies: 39
Views: 4890

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 ...
by dorkvader
05 Sep 2018, 03:04
Forum: Workshop
Topic: Man vs MicroSwitch: Converting a SD16234
Replies: 39
Views: 4890

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/La...
by dorkvader
03 Sep 2018, 19:22
Forum: Workshop
Topic: Man vs MicroSwitch: Converting a SD16234
Replies: 39
Views: 4890

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 that...
by dorkvader
03 Sep 2018, 05:43
Forum: Workshop
Topic: Man vs MicroSwitch: Converting a SD16234
Replies: 39
Views: 4890

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 nee...
by dorkvader
01 Sep 2018, 17:38
Forum: Workshop
Topic: Man vs MicroSwitch: Converting a SD16234
Replies: 39
Views: 4890

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 whateve...
by dorkvader
29 Aug 2018, 15:36
Forum: Workshop
Topic: Man vs MicroSwitch: Converting a SD16234
Replies: 39
Views: 4890

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 ...
by dorkvader
29 Aug 2018, 03:12
Forum: Workshop
Topic: Man vs MicroSwitch: Converting a SD16234
Replies: 39
Views: 4890

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 o...
by dorkvader
28 Aug 2018, 05:22
Forum: Workshop
Topic: Man vs MicroSwitch: Converting a SD16234
Replies: 39
Views: 4890

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 o...
by dorkvader
13 Mar 2018, 06:19
Forum: Gallery
Topic: 1977 microswitch keyboard
Replies: 10
Views: 3463

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 t...
by dorkvader
25 Feb 2018, 21:46
Forum: Workshop
Topic: Honeywell Micro Switch Reverse Engineering and Conversion thread
Replies: 111
Views: 13394

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, nothi...
by dorkvader
29 Jan 2018, 03:02
Forum: Workshop
Topic: Honeywell Micro Switch Reverse Engineering and Conversion thread
Replies: 111
Views: 13394

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/post398120....
by dorkvader
29 Jan 2018, 00:07
Forum: Workshop
Topic: Hall Effect Keyboard Sensing and Wiring Explained
Replies: 11
Views: 2466

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...
by dorkvader
28 Jan 2018, 22:57
Forum: Workshop
Topic: Hall Effect Keyboard Sensing and Wiring Explained
Replies: 11
Views: 2466

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 goin...
by dorkvader
28 Jan 2018, 21:37
Forum: Workshop
Topic: Hall Effect Keyboard Sensing and Wiring Explained
Replies: 11
Views: 2466

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 active ...
by dorkvader
28 Jan 2018, 20:56
Forum: Workshop
Topic: Hall Effect Keyboard Sensing and Wiring Explained
Replies: 11
Views: 2466

Hall Effect Keyboard Sensing and Wiring Explained

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. Vintag...
by dorkvader
03 Dec 2017, 18:31
Forum: Workshop
Topic: CommonSense: matrix LCR meter with a HID interface
Replies: 569
Views: 73219

Anyone knows how to make a spacebar to be more solid? Those washer retention clips are not ideal. Maybe a "retaining washer" that would actually grab hold of the barrel. Something like this: http://daemar.com/wp-content/uploads/2013/09/dmr-retaining-ring-ty-external-push-on-ring-flat-rim-01.jpg I h...
by dorkvader
13 Feb 2017, 17:11
Forum: Workshop
Topic: Honeywell Micro Switch Reverse Engineering and Conversion thread
Replies: 111
Views: 13394

XMIT and I met up recently, and he told me about this thread. so I will be cross posting my findings here from the GH thread I recently started: https://geekhack.org/index.php?topic=87453 Basically: switches require 0.13 mA unpressed and 4mA pressed. Next, I will be driving a switch with a 100kHz sq...
by dorkvader
22 Nov 2016, 22:21
Forum: Gallery
Topic: Alps AKB-3420 vintage keyboard
Replies: 36
Views: 5903

having a 1 layer PCB and numbered switches really helps wiring it up. Basically you want to figure out the matrix of rows and columns that make up the keyboard. So find out what switches are on the same row electrically, and the ones on the same column electrically. For example in your case, switche...
by dorkvader
12 Oct 2016, 03:27
Forum: Gallery
Topic: Yet another beamspring
Replies: 5
Views: 1192

I see they have opted for the very cheapest of the possible stabilizers for microswitch. I first saw this on a fisher rosemount industrial process control KB and as far as I know it's somewhat uncommon (and terrible)

All the other ones use beefy and awesome wires.
by dorkvader
20 Jul 2016, 20:31
Forum: Keyboards
Topic: How to troubleshoot broken Novatouch?
Replies: 9
Views: 1423

Yeah its a cap. The chip is a Topre-specific TP1684 capsense controller. http://www.kbdmania.net/xe/best_article/8164664 According to that, pin 2 (the one that goes to C15 and test point) might be some sort of bias control, which would explain why it's not working without it. It goes to ground, so i...
by dorkvader
08 Feb 2016, 05:16
Forum: Keyboards
Topic: What is the meaning of this novelty cap?
Replies: 3
Views: 683

its not a floater, its a glider, The smallest "moving" creature in Conway's Game of Life, the most popular cellular automata. It's also the hacker emblem http://www.catb.org/hacker-emblem/ I had some custom ones made a while ago from qwerkeys UK, but I didnt know SP did a run. I'd have got some for ...
by dorkvader
08 Feb 2016, 05:02
Forum: Gallery
Topic: Ultratec Supercom 4400 TTW w/ USw LXBW02 Switches
Replies: 10
Views: 1367

interesting! I have a few (three) of the at&t ones with cherry profile keycaps and MX blacks. I also know they used alps switches on some (and one PCB accepts alps or cherry switches if I recall correctly)

I plan to string some telephone wire between them and send messages to myself.
by dorkvader
08 Feb 2016, 04:29
Forum: Gallery
Topic: IBM Blue Alps
Replies: 48
Views: 6397

You'll notice the IBM logo is also in the MIDDLE of the badge rather than at the top, as usual. Maybe it's a way to recognise these boards. I'm still curious as to whether or not this is a knock off or a legitimate board produced by or for IBM. I am as well. I think it has to be legit. The 1390131 ...
by dorkvader
31 Aug 2015, 06:41
Forum: Keyboards
Topic: Proof that Friday is the best day of the week, hands down.
Replies: 90
Views: 6005

Also WHAT is that thing that says "4.00 MHZ" on it? Oo Quartz crystal oscillator, provides timing for the microcontroller on the board. mandolin crystal identified I think I have 2 of them now. AFAIK they were only used in late 1985 - early '86. which is what I would expect from a 1388032. If it ha...

Go to advanced search