Search found 325 matches
- 21 Nov 2022, 01:37
- Forum: Workshop
- Topic: IO expanders with RP2040
- Replies: 15
- Views: 5218
Re: IO expanders with RP2040
The data sheet seems to say that max output low (D080) is 0.6V, max input low (D031) is 0.2 Vdd = 0.6V @ 3V, min input high (D041) is 0.8 Vdd = 2.4V @3V. So it doesn't seem that 0.07V should be confusing anything. Maybe just go ahead and code up the matrix to set input pullups and one output low and...
- 13 Nov 2022, 23:54
- Forum: Workshop
- Topic: IO expanders with RP2040
- Replies: 15
- Views: 5218
Re: IO expanders with RP2040
spi_start doesn't actually communicate with the external device; it just configures the internal SPI to talk to it. So success just means no internal pin conflicts. You should look at the return value from spi_receive. If I am not mistaken, the only time this device will send you anything is when yo...
- 13 Nov 2022, 17:24
- Forum: Workshop
- Topic: IO expanders with RP2040
- Replies: 15
- Views: 5218
Re: IO expanders with RP2040
Oh, yes, you are absolutely right. I apologize for giving unsafe advice.
Just change the direction when scanning to set one low.
Just change the direction when scanning to set one low.
- 13 Nov 2022, 04:45
- Forum: Workshop
- Topic: IO expanders with RP2040
- Replies: 15
- Views: 5218
Re: IO expanders with RP2040
I assume you are following https://github.com/qmk/qmk_firmware/blob/master/docs/spi_driver.md and https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MCP23008-MCP23S08-Data-Sheet-DS20001919.pdf. Overall, I would expect: Two address pins are hardwired to fix SP...
- 18 Jun 2022, 16:45
- Forum: Workshop
- Topic: Wey MK06 without Connector Box
- Replies: 7
- Views: 2693
Re: Wey MK06 without Connector Box
In order to get all this working properly, the MK06 workstation needs to be configured to use the proper keycode table (KCT file). PCSIN001 is a good choice to start with: it has all the "standard" codes for the PC layout, which means that the translation to PS2 scan set 2 that happens on the TTL C/...
- 18 Jun 2022, 16:44
- Forum: Workshop
- Topic: Wey MK06 without Connector Box
- Replies: 7
- Views: 2693
Re: Wey MK06 without Connector Box
The global chip shortage got me thinking, though, about going outside the QMK ecosystem to CircuitPython. So, here is one with an Itsy-Bitsy M4 Express using the Atmel SAMD51. Wey-M4-converter.jpg Wey-M4-cable.jpg Wey-M4-converter-operating.jpg Now suppose one actually wanted a KVM (well K+M) keyboa...
- 18 Jun 2022, 16:39
- Forum: Workshop
- Topic: Wey MK06 without Connector Box
- Replies: 7
- Views: 2693
Re: Wey MK06 without Connector Box
A converter specifically for the MK06 interfaces to one of the serial ports. This could be directly to Port 4 or Port 5 and so implementing a single workstation. More interesting is to implement the DLINK protocol and so work for multiple workstations, possibly with different layouts or function key...
- 18 Jun 2022, 16:36
- Forum: Workshop
- Topic: Wey MK06 without Connector Box
- Replies: 7
- Views: 2693
Re: Wey MK06 without Connector Box
The easiest way to interface without a Connector Box is using PS2. Get an MDR 36 male connector from AliExpress or eBay. Build a cable that gives 12VDC from a wall wart to the two ends of the connector (- 1,19, + 18,36) and wires a 6-pin mini-DIN male (cut up an old cable) to Port 1 Clock, Data, and...
- 18 Jun 2022, 16:34
- Forum: Workshop
- Topic: Wey MK06 without Connector Box
- Replies: 7
- Views: 2693
Wey MK06 without Connector Box
The MK06 is a now obsolete KVM switching keyboard that can emulate a variety of trading keyboards. It is full-size, with three small LCD screens and two add-on keypads. The trading function keys tend to be garishly colored. The actual host connections, such as USB or PS2, as well as power for the ke...
- 29 Apr 2022, 17:48
- Forum: Workshop
- Topic: Cortron (ITW) 55-500216
- Replies: 10
- Views: 4411
Re: Cortron (ITW) 55-500216
I admit I have never seen the typewriter style, but I believe yours is another variant of keypunch, adding | and losing { and }. Compare with this , for instance, particularly keys 20-29. More details on the converter here . Do take note of the limitations of such a non-destructive conversion, though.
- 28 Apr 2022, 04:21
- Forum: Workshop
- Topic: My Deko Fast Action Keyboard project
- Replies: 17
- Views: 8275
Re: My Deko Fast Action Keyboard project
In case you're wondering, it's all PS2: Extra keys: .---.---. .---. .---.---.---.---. .---.---.---.---. .---.---. .---.---. .---.---. | 60| 17| | 1F| | 27| 2F| 37| 3F| | 56| 5E| 6F| 13| | 19| 39| | 51| 53| | 5C| 62| +---+---+ +---+ +-----+ .-------. .---. .---------------. .---------------. .-------...
- 25 Apr 2022, 04:06
- Forum: Workshop
- Topic: Cortron (ITW) 55-500216
- Replies: 10
- Views: 4411
Re: Cortron (ITW) 55-500216
The keyboard for the Sperry-Univac UDS-2000, pictured in the Wiki , uses a similar PCB, Cortron 55-500252. It comes in three styles , typewriter, adding machine, and keypunch. The photos in the Wiki are of the adding machine style, with 0 at the bottom (replacing part of the space bar). Here is the ...
- 18 Apr 2022, 05:32
- Forum: Workshop
- Topic: IR PC keyboards: IBM and Quadram
- Replies: 6
- Views: 3285
Re: IR PC keyboards: IBM and Quadram
An NEC product in this space is the PC-6601SR, aka Mr. PC. The keyboard can use infrared or a coiled cable, switching modes depending on whether it is plugged in. NEC-6601SR-case.jpg Someone has completely documented how this PC works, including schematics , keyboard scan codes , and keyboard protoc...
- 18 Mar 2022, 01:17
- Forum: Workshop
- Topic: Hi-Tek 725 terminal keyboard
- Replies: 13
- Views: 5067
Re: Hi-Tek 725 terminal keyboard
I've been working on decoding the ADDS protocol recently Maybe not the same protocol, but did you see this ? Code for that is here . I see that you have uploaded the ADDS ASCII firmware to Bitsavers (thanks), so reading that (or looking at traces where a real terminal is connected) should be enough...
- 13 Mar 2022, 22:24
- Forum: Keyboards
- Topic: Nixdorf Keyboard
- Replies: 12
- Views: 4269
Re: Nixdorf Keyboard
Okay, I had a chance to look at a G80-0801. First, to make sure that the numbering is consistent. I believe that in the close-up photo on Google Drive linked to above, it shows how S1 is numbered, with 1 at the top-left then 2 beside it. I therefore read the pinout as follows. S1:2 - DE-9:1 - green ...
- 09 Feb 2022, 18:44
- Forum: Workshop
- Topic: Consul 262.4
- Replies: 0
- Views: 1129
Consul 262.4
I do not have one of these keyboards, but I do have a Consul 262.3 and was asked about the difference and the possibility of converting the 262.4. Here are some notes on that. The short version, as noted in passing here is that the 262.3 is a parallel ASCII keyboard and the 262.4 is the serial versi...
- 23 Jan 2022, 19:30
- Forum: Keyboards
- Topic: Look at this Cool Find (Memorex 2051 Terminal Keyboard)
- Replies: 6
- Views: 6471
Re: Look at this Cool Find (Memorex 2051 Terminal Keyboard)
From the photos (and a few more clearer ones), it is possible to mostly work out how this operates. It also helps to understand how the 5251 keyboard communicates, because some of those ideas were borrowed, too. Program 8048 microcontroller (4) 74373 latch (2) and PROM (3) implement extended program...
- 17 Jan 2022, 06:27
- Forum: Workshop
- Topic: Sharp X1 Turbo
- Replies: 0
- Views: 8498
Sharp X1 Turbo
This keyboard is for a Sharp X1 Turbo. Sharp-X1-case.jpg This particular model, DSETK0011CE00, has green Alps, so it is nice enough to type on, but thankfully not yet a target for those harvesting switches. The lock keys are physically locking; there are no indicators. Sharp-X1-back.jpg The cable te...
- 08 Jan 2022, 06:55
- Forum: Want to buy
- Topic: [WTB][EU-HU] Deko Fast Action
- Replies: 1
- Views: 2207
Re: [WTB][EU-HU] Deko Fast Action
When you get one, I can pass along the extra PS/2 codes that control the small-button LEDs and the VFD.
- 08 Jan 2022, 06:48
- Forum: Want to buy
- Topic: [WTB] Keyboard and mouse for an Apollo Domain Series 3000
- Replies: 8
- Views: 5938
Re: [WTB] Keyboard and mouse for an Apollo Domain Series 3000
Well, I can confirm (and the Technical Reference does, too) that the mouse connector on the back of the keyboard is DE-9 F, so it will at least fit. The keyboard firmware reads that raw mouse and in turn encodes it within a 1200 baud TTL-level serial keyboard+mouse protocol that talks to the system.
- 08 Jan 2022, 06:15
- Forum: Want to buy
- Topic: [WTB] Keyboard and mouse for an Apollo Domain Series 3000
- Replies: 8
- Views: 5938
Re: [WTB] Keyboard and mouse for an Apollo Domain Series 3000
The Apollo mouse is not like serial PC mice: even though it uses a DE-9, it isn't RS-232.
It's like the original Macintosh mouse, exposing X- and Y-quadrature lines directly, along with the buttons. Although the pinout isn't the same.
See here.
It's like the original Macintosh mouse, exposing X- and Y-quadrature lines directly, along with the buttons. Although the pinout isn't the same.
See here.
- 01 Jan 2022, 02:19
- Forum: Workshop
- Topic: Xerox 820-II Keyboards
- Replies: 0
- Views: 10943
Xerox 820-II Keyboards
When a keyboard has a 25-pin D-sub connector, it generally has some kind of parallel output. Occasionally, this is the raw switch matrix connections. Or it can have four inputs to a row selector and outputs for the column states in the row so selected. These cases are easy to recognize by what activ...
- 26 Dec 2021, 22:49
- Forum: Workshop
- Topic: ADDS ASCII in ADDS Mode
- Replies: 1
- Views: 8455
ADDS ASCII in ADDS Mode
ADDS ASCII keyboards have four sets of jumpers that switch between PC/AT and ADDS mode. I believe most people just check these, replace with PC mode when necessary, and use the board with Soarer's converter, end of story. But what if one doesn't replace them or does so in the opposite direction? I i...
- 20 Dec 2021, 06:09
- Forum: Keyboards
- Topic: Sanyo MBC 550 conversion
- Replies: 1
- Views: 4181
Re: Sanyo MBC 550 conversion
It's 1200 baud serial ASCII. See https://geekhack.org/index.php?topic=86197.0.
- 24 Nov 2021, 05:38
- Forum: Workshop
- Topic: Convergent Technologies and Negative Serial
- Replies: 14
- Views: 17435
Re: Convergent Technologies and Negative Serial
This is a keyboard for a Sperry-Univac UTS terminal. UTS-case.jpg I believe that this is the so-called Low Profile Expanded Typewriter keyboard. UTS-back.jpg It is Key Tronic foam and foil. The foam on this particular one (from around 1988) is substantially intact, so I have not yet undertaken repla...
- 22 Nov 2021, 21:18
- Forum: Workshop
- Topic: Some parallel ASCII keyboards
- Replies: 7
- Views: 13306
Re: Some parallel ASCII keyboards
Another 55SW board with the same thick doubleshot keycaps with ASCII control legends. 55SW1-10-top.jpg This is SW-11769 / 55SW1-10. 55SW1-10-side.jpg The parallel output on the edge connector is substantially the same as SW-11234 / 55SW5-2 above, though the STROBE signal is not inverted (so rising t...
- 21 Nov 2021, 22:02
- Forum: Keyboards
- Topic: Which generation of Fujitsu Leaf Spring is this?
- Replies: 12
- Views: 5180
- 17 Nov 2021, 04:43
- Forum: Keyboards
- Topic: Need help! Which switches is it??
- Replies: 2
- Views: 1131
- 15 Nov 2021, 07:05
- Forum: Workshop
- Topic: Convergent Technologies and Negative Serial
- Replies: 14
- Views: 17435
Re: Convergent Technologies and Negative Serial
Converting a Sun Type 3 keyboard got me revisiting how that converter works again. The existing one, as described above, which originally ran its own firmware project, but now has QMK configured for hardware serial -- there is an inverter -- isn't really suitable for a DA-15. Sun-45-converter.jpg So...
- 25 Oct 2021, 08:09
- Forum: Workshop
- Topic: Some parallel ASCII keyboards
- Replies: 7
- Views: 13306
Re: Some parallel ASCII keyboards
Another Maxi-Switch linear. This one is 2160094, with PCB 630010-10. Maxi-Switch-2160094-top.jpg Maxi-Switch-2160094-bottom.jpg A general purpose microcontroller is used in place of just a converter, but there isn't anything interesting going on with the output encoding. It has both an edge connecto...