Search found 775 matches

by Engicoder
22 Jan 2019, 19:47
Forum: Gallery
Topic: IBM stash in Houston
Replies: 36
Views: 1407

Re: IBM stash in Houston

Nice. That space invaders board looks essentially new. I bet those feel nice.
by Engicoder
16 Jan 2019, 16:14
Forum: Workshop
Topic: Cleaning a plate without removing switches
Replies: 16
Views: 432

Re: Cleaning a plate without removing switches

Hypersphere's instructions are excellent. I will add that I find having some foam swabs in addition to cotton ones is useful as they come in several sizes and don't leave fibers on sharp edges. I find these small ones are useful to get in the narrow areas and crevices. https://www.amazon.com/Semi-Fl...
by Engicoder
11 Jan 2019, 19:36
Forum: Gallery
Topic: IBM stash in Houston
Replies: 36
Views: 1407

Re: IBM stash in Houston

Who knows what treasures are hidden in the heap. Good luck!
by Engicoder
09 Jan 2019, 02:50
Forum: Gallery
Topic: Atari PC2 8088 Keyboard
Replies: 2
Views: 207

Re: Atari PC2 8088 Keyboard

Really nice. I love seeing rare space invaders boards. Holy card fish look at those feet!!
by Engicoder
07 Jan 2019, 19:58
Forum: Keyboards
Topic: Making a Secure Keyboard
Replies: 12
Views: 541

Re: Making a Secure Keyboard

Some of the teensy boards have a microcontroller with a small amount of eeprom (1K), which is persistent, but no other persistent memory. More could be added by connecting an external eeprom or disk storage such as an SD card.
by Engicoder
07 Jan 2019, 01:23
Forum: Want to buy
Topic: Atari PC2 8088 Keyboard
Replies: 1
Views: 120

What caps do you need? I have some extra space invader caps, as long as they aren't specific to that board I may be able to help.
by Engicoder
02 Jan 2019, 22:59
Forum: Deskthority talk
Topic: DT Update Log and TODO
Replies: 312
Views: 6540

Fingers crossed.
by Engicoder
24 Dec 2018, 05:16
Forum: Gallery
Topic: IBM Model F AT restoration
Replies: 17
Views: 769

Looks great! I agree with fohat, the ANSI enter/backslash and backspace mod is well worth doing for the 2u backspace and does not require any non reversible modifications.
by Engicoder
21 Dec 2018, 19:39
Forum: Gallery
Topic: IBM Model F AT restoration
Replies: 17
Views: 769

fohat wrote: Whoa!

That mat looks very thick and stiff.
Will it squish? :lol:
by Engicoder
21 Dec 2018, 19:37
Forum: Gallery
Topic: What's in the box?!?!?! (IBM Industrial SSK)
Replies: 17
Views: 742

Nice pickup. Good luck with straightening that case. That should be an adventure!
by Engicoder
17 Dec 2018, 00:21
Forum: Gallery
Topic: IBM Model F AT restoration
Replies: 17
Views: 769

This thread covers the various options people use
keyboards-f2/replacement-foam-mat-for-i ... t8033.html
and this one from GH
https://geekhack.org/index.php?topic=58814.0
by Engicoder
13 Dec 2018, 17:20
Forum: Keyboards
Topic: What do "M" and "F" stand for?
Replies: 32
Views: 1568

It's simply the IBM designation for the technology used for the line of keyboards.
by Engicoder
12 Dec 2018, 20:51
Forum: Workshop
Topic: A solution for cracked Hi-Tek switches (VT100, Hazeltine, HP, etc.)
Replies: 6
Views: 229

Smart idea. The slight loss in travel seems very acceptable to have a functioning key.
by Engicoder
11 Dec 2018, 06:47
Forum: Keyboards
Topic: Alps switch identity?
Replies: 7
Views: 281

Noodle called it, its alps spring over membrane. I have a few loose examples of this switch as well. Also the same switch with white slider.
by Engicoder
11 Dec 2018, 03:43
Forum: Workshop
Topic: C.ITOH CIT324/324E - Alps Buckling Springs... (Conversion to USB?)
Replies: 38
Views: 1765

Nice work! Agree, that clicker is a bit much. :shock:
by Engicoder
11 Dec 2018, 02:29
Forum: DTA News
Topic: Deskthority Awards 2018: the Winners!
Replies: 71
Views: 2473

I had a friend who was able to debug code by listening to the PC beeper tonal fluctuations (this is actually a true story) I had a problem about 20 years ago where I had to use subtle variations in drive light activity as part of my debugging for a file replication problem. Of course this was back ...
by Engicoder
11 Dec 2018, 02:20
Forum: Workshop
Topic: Low quality solder, iron, and desoldering iron - burnt my PCB pads
Replies: 24
Views: 515

@__red__ touched on two important factors that most beginners under appreciate: flux and tip selection. Flux does wonders for getting solder to behave nicely and the correct tip allows for quick work without over or under heating. This old video covers from Pace the basics better than any other I ha...
by Engicoder
11 Dec 2018, 00:09
Forum: Deskthority talk
Topic: Future of DT
Replies: 80
Views: 2151

Edit: hansichen already mentioned this, but... The wiki is invaluable and I have a long list of things I have been meaning to add. My biggest hurdle is the amount of time it takes to add a set of pictures to the wiki. The current process requires adding each picture individually and entering the sam...
by Engicoder
10 Dec 2018, 23:33
Forum: Keyboards
Topic: Zenith Z-150 black badge still not convert-able?
Replies: 5
Views: 213

It is most certainly convertible. The problems have been that existing configurable converters such as Soarer's do not handle it correctly at all times, specifically the reset line. There are a number of "XT" keyboards that have proprietary variations from what IBM used with it's PC/XT keyboard and ...
by Engicoder
10 Dec 2018, 20:16
Forum: Gallery
Topic: AKB-3320
Replies: 16
Views: 543

Really nice find.Thanks for sharing and providing such a detailed writeup.
by Engicoder
10 Dec 2018, 20:13
Forum: Keyboards
Topic: NBM RT6671?
Replies: 5
Views: 224

Definitely the slider over dome. Keycap profile is wrong for 725 series (i.e. space invaders). Space invaders has a lower profile and in 99% of cases a stepped caps lock key. I have never seen an RT-6xxx with space invaders. RT-8xxx indicates space invaders.
by Engicoder
05 Dec 2018, 23:18
Forum: Workshop
Topic: Mechamorphosis
Replies: 26
Views: 679

Really nice work! I love all the details.
by Engicoder
05 Dec 2018, 21:49
Forum: Workshop
Topic: IBM 5110/5120 keyboard conversion
Replies: 72
Views: 1940

All the silver ones are hermetically sealed, axial electrolytics, probably tantalum. The yellow ones are either polystyrene film or old avx molded ceramic; 12nF from code ('123')
by Engicoder
28 Nov 2018, 05:12
Forum: Workshop
Topic: IBM 5110/5120 keyboard conversion
Replies: 72
Views: 1940

Comparing it to others one the same page, it is definitely the capital letter 'O' and not the number zero '0' but the question is, is it a typo.
@snuci, do you happen to have the schematics for the 5110 (i.e. Ibm 5110 System Logic Manual)
by Engicoder
27 Nov 2018, 16:20
Forum: Workshop
Topic: Unpopulated sockets on a keyboard PCB
Replies: 4
Views: 191

The empty socket was most likely for a ROM chip. Currently the keyboard has an Intel 8048 microcontroller which has on-board ROM for program code, but PCB offers the flexibility of using an 8039 or 8040 microcontroller which does not have ROM and store the program in the separate ROM chip. In additi...
by Engicoder
27 Nov 2018, 16:03
Forum: Workshop
Topic: IBM 5110/5120 keyboard conversion
Replies: 72
Views: 1940

Oh, and You have to pay attention to point 2) of the guide " the selection of a device address then makes the data available on the bus in bits lines " So the 5110 keyboard should worlk like this: a) a key is pressed and released b) a "scan counter chip or circuit" records the keycode in an interna...
by Engicoder
27 Nov 2018, 15:53
Forum: Workshop
Topic: IBM 5110/5120 keyboard conversion
Replies: 72
Views: 1940

From the pinout you posted, I would assume, as lucar mentioned, that the data is parallel, i.e. Kbd 0 through Kbd 7 are the bits of the scan code and Kbd P is a parity bit, although a parity bit is unusual with parallel data.
by Engicoder
14 Nov 2018, 04:58
Forum: Keyboards
Topic: AMPEX 220 Converter
Replies: 3
Views: 183

What does the back label say? I have a very similar board (without the awesome caps) that sends ANSI key values via asynch serial.
by Engicoder
12 Nov 2018, 04:30
Forum: Workshop
Topic: Televideo - The beginning of a journey. The end of my social life.
Replies: 79
Views: 3137

Thanks for posting the video! I love the thockiness of these boards. Just finished sprucing up these two for engicoder. I thought they looked particularly nice. Thank you, snacks! I am really looking forward to these two. I will be able to reunite "The Patriot" with his as yet un-named 101 key Libe...
by Engicoder
11 Nov 2018, 07:04
Forum: Keyboards
Topic: Tips for NMB maintenance?
Replies: 9
Views: 318

Great video. Very clear even if it is upside down :P

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