[Keyboard] Magnavox Videowriter conversion with Pro Micro (#7634)

* Magnavox Videowriter convertion

* Magnavox Videowriter: readme, images

* Update keyboards/handwired/videowriter/info.json

* Update keyboards/handwired/videowriter/README.md

* Update keyboards/handwired/videowriter/README.md

* Update keyboards/handwired/videowriter/info.json

* Update keyboards/handwired/videowriter/info.json

* Update keyboards/handwired/videowriter/info.json

* Update keyboards/handwired/videowriter/info.json

* Update keyboards/handwired/videowriter/info.json

* suggested changes

* suggested changes

* fix comment symbol

* Update keyboards/handwired/videowriter/rules.mk

* Update keyboards/handwired/videowriter/rules.mk

* Update keyboards/handwired/videowriter/rules.mk

1 files changed, 61 insertions, 0 deletions

diff --git a/keyboards/handwired/videowriter/README.md b/keyboards/handwired/videowriter/README.md
new file mode 100644
index 0000000000..ef8471aa91
--- /dev/null
+++ b/keyboards/handwired/videowriter/README.md
@@ -0,0 +1,61 @@
+# QMK-based firmware for Magnavox Videowriter keyboard
+Matrix layout is based on info from this [article](https://deskthority.net/workshop-f7/magnavox-videowriter-keyboard-cleanup-and-conversion-t19687.html).
+
+![Videowriter](https://i.imgur.com/zNTHmZa.jpg)
+
+Magnavox Videowriter keyboard conversion project: direct connection of Pro Micro to the matrix.
+
+* Keyboard Maintainer: [DmNosachev](https://github.com/DmNosachev)
+* 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).
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/videowriter:default
+
+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).
+
+# Modding
+
+## Matrix
+
+Videowriter has 8x10 matrix:
+
+| col/row | 0        | 1         | 2         | 3         | 4        | 5         | 6         | 7       |
+|---------|----------|-----------|-----------|-----------|----------|-----------|-----------|---------|
+| 0       |          |           |           |           |          |           | 51 LShift | 39 Caps |
+| 1       | 08 Copy  | 07 Find   | 06 Split  | 05 Center | 04 Page  | 03 Spell  | 02 Print  | 01 Menu |
+| 2       | 16  5    | 15  4     | 14  3     | 13  2     | 12   1   | 11 Delete | 10 GoTo   | 09 Move |
+| 3       | 24 BkSpc | 23 Equals | 22 Minus  | 21  0     | 20  9    | 19  8     | 18  7     | 17  6   |
+| 4       | 32 U     | 31 Y      | 30 T      | 29 R      | 28 E     | 27 W      | 26 Q      | 25 Tab  |
+| 5       | 41 S     | 40 A      | 38 Return | 37 ]      | 36 [     | 35 P      | 34 O      | 33 I    |
+| 6       | 49 ;     | 48 L      | 47 K      | 46 J      | 45 H     | 44 G      | 43 F      | 42 D    |
+| 7       | 58 M     | 57 N      | 56 B      | 55 V      | 54 C     | 53 X      | 52 Z      | 50 "    |
+| 8       | 67 Left  | 66 Up     | 65 Insert | 64 Space  | 63 Style | 61 /      | 60 .      | 59 ,    |
+| 9       |          |           | 62 RShift | 72 Undo   | 71 Help  | 70 Do     | 69 Right  | 68 Down |
+
+## Separating Shift keys
+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).
+
+![Right shift](https://i.imgur.com/ttdTVtC.jpg)
+
+## Stock components removal
+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).
+I've also removed two electrolytic capacitors and some ceramic capacitors just to free an additional space. 
+
+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.
+
+## Pro Micro
+Suggested mount position for the Pro Micro:
+
+![PCB bottom side](https://i.imgur.com/bb7zZD0.jpg)
+
+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).
+2. Solder the Pro Micro to the Videowriter's PCB.
+3. Solder 6 wire bridges (pink color on the photo).
+4. By this point rows 0-4 and all columns will be already in place.
+5. Connect rows 5-9 (see right side of the PCB) to the corresponding pins of the Pro Micro using additional wires.
+6. Optional: connect a push button between Reset and Ground pins.
+
+![PCB top side](https://i.imgur.com/PVEXIxj.jpg)
+
+Compile and flash the firmware. Use matrix [debug mode](https://docs.qmk.fm/#/feature_command) if something is wrong.