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Author Topic: IBM Model M 1394312 Converter DIY Question  (Read 1445 times)

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Offline shananiki

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IBM Model M 1394312 Converter DIY Question
« on: Fri, 07 February 2025, 06:27:00 »
Hey there,

I just got my hands on this IBM Model M. As I am one of the few new breeds of IBM AS400 Developers I was amazed by keyboards with F13-F24.
I'm sure I can convert to USB using a RP2040 Zero or ESP32.

However I'm asking the simple question what kind of female module do I need to buy? It's not standard RJ45 is it?
I don't want to buy random stuff of Aliexpress.
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Offline zegonix

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Re: IBM Model M 1394312 Converter DIY Question
« Reply #1 on: Fri, 07 February 2025, 07:34:09 »
try it with a smaller number: https://en.wikipedia.org/wiki/Registered_jack
probably 6p6c, or 6p4c
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Offline fohat.digs

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Re: IBM Model M 1394312 Converter DIY Question
« Reply #2 on: Fri, 07 February 2025, 07:42:24 »
These have been working for most of us for years.

https://geekhack.org/index.php?topic=17458.0
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Bret Stephens (NYT 2025-03-10) starts with the tariffs, noting that every president since the Great Depression has correctly concluded that the ensuing economic crisis and World War that followed that calamity was attributable in large part to the notorious 1930 Smoot Hawley Tariffs.
That is, until the current occupant of the Oval Office. Until him, no U.S. president has been so ignorant of the lessons of history. Until him, no U.S. president has been so incompetent in putting his own ideas into practice. That’s a conclusion that stock markets seem to have drawn as they plunged following the Trump triple whammy: first, tariff threats against our largest trading partners, spelling much higher costs; second, twice-repeated monthlong reprieves on some of those tariffs, meaning a zero-predictability business environment; finally, his tacit admission, to Maria Bartiromo of Fox News, that the United States could go into recession this year, and that it’s a price he’s willing to pay to do what he calls a “big thing.” In short, a willful, erratic and heedless president is prepared to risk both the U.S. and global economy to make his ideological point. This won’t end well, especially in a no-guardrails administration staffed by a how-high team of enablers and toadies.
But Stephens goes further than simply castigating these pointless and destructive tariffs that Trump has taken such a pathological shine to. He explains how the fancifully created “Department of Governmental Efficiency, (“DOGE”) would be more aptly characterized as an engine of wholesale destruction. Because nothing Musk is doing is about “efficiency.”

Offline shananiki

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  • Posts: 3
Re: IBM Model M 1394312 Converter DIY Question
« Reply #3 on: Fri, 07 February 2025, 09:06:27 »
Quote from: zegonix on Fri, 07 February 2025, 07:34:09
try it with a smaller number: https://en.wikipedia.org/wiki/Registered_jack
probably 6p6c, or 6p4c
Would a RJ45 female fit? I can just only wire the necessary lines.

Quote from: fohat.digs on Fri, 07 February 2025, 07:42:24
These have been working for most of us for years.

https://geekhack.org/index.php?topic=17458.0

I see thanks, but I'd love to use a USB C device. That guide was made before USB C was available, should work with any Atmega though.
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Offline zegonix

  • Posts: 68
Re: IBM Model M 1394312 Converter DIY Question
« Reply #4 on: Fri, 07 February 2025, 10:10:38 »
Assuming, that i am right, NO.

The RJ45 is 8Pxx which is wider than the 4Pxx/6Pxx
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Offline wjrii

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  • Location: Texas
Re: IBM Model M 1394312 Converter DIY Question
« Reply #5 on: Fri, 07 February 2025, 21:59:16 »
Try here: https://sharktastica.co.uk/kb_db_list?search=1394312

Looks like it's a normal RJ-45.  Both the Soarer's and the Hasu can be made with a USB C Pro Micro Atmel 32u4 microcontroller.  I have made three myself, one running Hasu's converter and two running Soarer's.  You can also open up the board and safely stash the original cable and just thread a sufficiently long USB cord through the existing opening and mount the converter inside, or wire a USB-C daughterboard with the right configuration.
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Offline shananiki

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Re: IBM Model M 1394312 Converter DIY Question
« Reply #6 on: Mon, 24 February 2025, 23:35:33 »
I know my soldering skills leave much room for improvement.
I got it to work with a ESP32-S2.

However there are a few keys missing. Does anybody have experience with this?

These are the keys I have mapped so far (I have a german qwertz layout)

Code: [Select]
SCANCODE_TO_HID = {
    0x1C: Keycode.A, 0x32: Keycode.B, 0x21: Keycode.C, 0x23: Keycode.D, 0x24: Keycode.E,
    0x2B: Keycode.F, 0x34: Keycode.G, 0x33: Keycode.H, 0x43: Keycode.I, 0x3B: Keycode.J,
    0x42: Keycode.K, 0x4B: Keycode.L, 0x3A: Keycode.M, 0x31: Keycode.N, 0x44: Keycode.O,
    0x4D: Keycode.P, 0x15: Keycode.Q, 0x2D: Keycode.R, 0x1B: Keycode.S, 0x2C: Keycode.T,
    0x3C: Keycode.U, 0x2A: Keycode.V, 0x1D: Keycode.W, 0x22: Keycode.X, 0x35: Keycode.Y,
    0x1A: Keycode.Z, 0x45: Keycode.ZERO, 0x16: Keycode.ONE, 0x1E: Keycode.TWO,
    0x26: Keycode.THREE, 0x25: Keycode.FOUR, 0x2E: Keycode.FIVE, 0x36: Keycode.SIX,
    0x3D: Keycode.SEVEN, 0x3E: Keycode.EIGHT, 0x46: Keycode.NINE, 0x0E: Keycode.GRAVE_ACCENT,
    0x4E: Keycode.MINUS, 0x55: Keycode.EQUALS, 0x5C: Keycode.BACKSLASH, 0x66: Keycode.BACKSPACE,
    0x29: Keycode.SPACE, 0x0D: Keycode.TAB, 0x14: Keycode.CAPS_LOCK, 0x12: Keycode.SHIFT,
    0x11: Keycode.CONTROL, 0x8B: Keycode.GUI, 0x19: Keycode.ALT, 0x59: Keycode.SHIFT,
    0x58: Keycode.CONTROL, 0x8C: Keycode.GUI, 0x39: Keycode.ALT, 0x8D: Keycode.APPLICATION,
    0x5A: Keycode.ENTER, 0x08: Keycode.ESCAPE, 0x07: Keycode.F1, 0x0F: Keycode.F2,
    0x17: Keycode.F3, 0x1F: Keycode.F4, 0x27: Keycode.F5, 0x2F: Keycode.F6,
    0x37: Keycode.F7, 0x3F: Keycode.F8, 0x47: Keycode.F9, 0x4F: Keycode.F10,
    0x56: Keycode.F11, 0x5E: Keycode.F12, 0x57: Keycode.PRINT_SCREEN, 0x5F: Keycode.SCROLL_LOCK,
    0x62: Keycode.PAUSE, 0x54: Keycode.LEFT_BRACKET, 0x5B: Keycode.RIGHT_BRACKET,
    0x4C: Keycode.SEMICOLON, 0x52: Keycode.QUOTE, 0x41: Keycode.COMMA, 0x49: Keycode.PERIOD,
    0x4A: Keycode.FORWARD_SLASH, 0x67: Keycode.INSERT, 0x6E: Keycode.HOME, 0x6F: Keycode.PAGE_UP,
    0x64: Keycode.DELETE, 0x65: Keycode.END, 0x6D: Keycode.PAGE_DOWN, 0x63: Keycode.UP_ARROW,
    0x61: Keycode.LEFT_ARROW, 0x60: Keycode.DOWN_ARROW, 0x6A: Keycode.RIGHT_ARROW,
    0x76: Keycode.KEYPAD_NUMLOCK, 0x4A: Keycode.KEYPAD_FORWARD_SLASH, 0x7E: Keycode.KEYPAD_ASTERISK,
    0x4E: Keycode.KEYPAD_MINUS, 0x7C: Keycode.KEYPAD_PLUS, 0x79: Keycode.KEYPAD_ENTER,
    0x71: Keycode.KEYPAD_PERIOD, 0x70: Keycode.KEYPAD_ZERO, 0x69: Keycode.KEYPAD_ONE,
    0x72: Keycode.KEYPAD_TWO, 0x7A: Keycode.KEYPAD_THREE, 0x6B: Keycode.KEYPAD_FOUR,
    0x73: Keycode.KEYPAD_FIVE, 0x74: Keycode.KEYPAD_SIX, 0x6C: Keycode.KEYPAD_SEVEN,
    0x75: Keycode.KEYPAD_EIGHT, 0x7D: Keycode.KEYPAD_NINE
}
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