deskthority

Much of the trading function handling is inside the keyboard itself, so the firmware naturally makes some assumptions that limit what one can do a bit.

For external power, REG1 , visible in the third photo, is connected to pin 23. Give it 9-12V DC, like from a wall wart. Ground is on pins 3, 8-13 ...

Should anyone care to convert without rebraining, it is not that complicated.

The DIN-8 pinout is as follows:

1, 8 Clock
2 Data
3 Reset
4 Ground
5 +5V
6 Busy
7 End


The protocol has eight bit key codes. A clock pulse signals each bit. Additionally, if the end signal is high, that is the ...

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 ...

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 ...

Oh, yes, you are absolutely right. I apologize for giving unsafe advice.

Just change the direction when scanning to set one low.

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

When you get one, I can pass along the extra PS/2 codes that control the small-button LEDs and the VFD.

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.

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.

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 ...

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 ...

It's 1200 baud serial ASCII. See https://geekhack.org/index.php?topic=86197.0.

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 ...

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 ...

Reimu64 wrote: 21 Nov 2021, 21:45 I have no idea what 61, 62 or 63 stands for.

Showa 62 is 1987.

Check the wiki.