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62 lines
3.9 KiB
Markdown
62 lines
3.9 KiB
Markdown
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# QMK-based firmware for Magnavox Videowriter keyboard
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Matrix layout is based on info from this [article](https://deskthority.net/workshop-f7/magnavox-videowriter-keyboard-cleanup-and-conversion-t19687.html).
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Magnavox Videowriter keyboard conversion project: direct connection of Pro Micro to the matrix.
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* Keyboard Maintainer: [DmNosachev](https://github.com/DmNosachev)
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* Hardware Supported: Alps-based [Magnavox Videowriter keyboard](https://deskthority.net/wiki/Magnavox_VideoWriter), Pro Micro 16MHz 5V MCU board (you can use any MCU which is supported by QMK and has 18 or more IO).
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Make example for this keyboard (after setting up your build environment):
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make handwired/videowriter:default
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See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
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# Modding
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## Matrix
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Videowriter has 8x10 matrix:
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| col/row | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
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|---------|----------|-----------|-----------|-----------|----------|-----------|-----------|---------|
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| 0 | | | | | | | 51 LShift | 39 Caps |
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| 1 | 08 Copy | 07 Find | 06 Split | 05 Center | 04 Page | 03 Spell | 02 Print | 01 Menu |
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| 2 | 16 5 | 15 4 | 14 3 | 13 2 | 12 1 | 11 Delete | 10 GoTo | 09 Move |
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| 3 | 24 BkSpc | 23 Equals | 22 Minus | 21 0 | 20 9 | 19 8 | 18 7 | 17 6 |
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| 4 | 32 U | 31 Y | 30 T | 29 R | 28 E | 27 W | 26 Q | 25 Tab |
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| 5 | 41 S | 40 A | 38 Return | 37 ] | 36 [ | 35 P | 34 O | 33 I |
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| 6 | 49 ; | 48 L | 47 K | 46 J | 45 H | 44 G | 43 F | 42 D |
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| 7 | 58 M | 57 N | 56 B | 55 V | 54 C | 53 X | 52 Z | 50 " |
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| 8 | 67 Left | 66 Up | 65 Insert | 64 Space | 63 Style | 61 / | 60 . | 59 , |
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| 9 | | | 62 RShift | 72 Undo | 71 Help | 70 Do | 69 Right | 68 Down |
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## Separating Shift keys
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Initially left and right Shift keys are connected in parrallel. You need to cut the traces from right Shift (switch 62) and wire it to column 2 (switch 65, right pin) and row 9 (switch 71, bottom pin).
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## Stock components removal
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SN74LS145N IC (BCD-to-decimal decoder, drives matrix rows), NEC D8049HC IC (MCU, drives matrix columns) and resistor array need to be desoldered from the PCB. You need to shorten the 4 diodes (D2–D5) in the bottom right corner of the PCB (solder a wire between their pins).
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I've also removed two electrolytic capacitors and some ceramic capacitors just to free an additional space.
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Optional: add diodes between each switch and corresponding row for NKRO. If you choose not to add them, create `config.h` file in your personal keymap folder and add `#define MATRIX_HAS_GHOST` to it.
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## Pro Micro
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Suggested mount position for the Pro Micro:
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1. Solder two 8-pin headers to the Pro Micro (pin D1-B5 on the left side and pins F4-B6 on the right side).
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2. Solder the Pro Micro to the Videowriter's PCB.
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3. Solder 6 wire bridges (pink color on the photo).
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4. By this point rows 0-4 and all columns will be already in place.
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5. Connect rows 5-9 (see right side of the PCB) to the corresponding pins of the Pro Micro using additional wires.
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6. Optional: connect a push button between Reset and Ground pins.
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Compile and flash the firmware. Use matrix [debug mode](https://docs.qmk.fm/#/feature_command) if something is wrong.
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