Skip to content
Branch: master
Find file History
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Type Name Latest commit message Commit time
..
Failed to load latest commit information.
keymaps
README.md
config.h
info.json
rules.mk
videowriter.c
videowriter.h

README.md

QMK-based firmware for Magnavox Videowriter keyboard

Matrix layout is based on info from this article.

Videowriter

Magnavox Videowriter keyboard conversion project: direct connection of Pro Micro to the matrix.

  • Keyboard Maintainer: DmNosachev
  • Hardware Supported: Alps-based Magnavox Videowriter keyboard, 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 and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.

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

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

  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

Compile and flash the firmware. Use matrix debug mode if something is wrong.

You can’t perform that action at this time.