PC98 to USB keyboard protocol converter
=======================================
Target MCU is ATMega32u2 but other USB capable AVR will also work.
Connector
---------
On host/converter:
8Pin mini DIN
___ ___
/ |_| \
/ 8 7 6 \
| 5 4 3 |
\_ 2 1 _/
\_____/
(receptacle)
Wiring: You can change this with editing config.h.
Pin mini DIN MCU
----------------------------------
1 ~RST(TXD) PD3
2 GND GND
3 ~RDY PD4
4 RXD PD2
5 ~RTY PD1
6 NC
7 NC
8 5V VCC
Protocol
--------
Signal: Asynchronous, Positive logic, 19200baud, Least bit first
Frame format: 1-Start bit(Lo), 8-Data bits, Odd-Parity, 1-Stop bit
Build Firmware
--------------
Just use 'make' to bild firmware for TMK PC98 converter.
$ make clean
$ make
To flash firmware
$ make dfu
then push button on converter to flash firmware.
If you are using ATMega32u4 based board instead of premade TMK PC98 converter(ATMega32u2) use following commands.
$ make -f Makefile.32u4 clean
$ make -f Makefile.32u4
$ make -f Makefile.32u4 dfu
PC98 Scan Codes
---------------
,---. ,---. ,------------------------. ,------------------------. ,------------------------.
|Pau| |PrS| | F1 | F2 | F3 | F4 | F5 | | F6 | F7 | F8 | F9 | F10| | F11| F12| F13| F14| F15|
`---' `---' `------------------------' `------------------------' `------------------------'
,-------------------------------------------------------------. ,-------. ,---------------.
| Esc| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|JPY|Bspc| |Ins|Del| |Hom|End| -| /|
|-------------------------------------------------------------| |-------| |---------------|
| Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]| | |PgD|PgU| | 7| 8| 9| *|
|-------------------------------------------------------`Enter| |-------| |---------------|
|Ctl|Cap| A| S| D| F| G| H| J| K| L| ;| '| \| | | Up | | 4| 5| 6| +|
|-------------------------------------------------------------| |-------| |---------------|
| Shift | Z| X| C| V| B| N| M| ,| .| /| RO| Shift | |Lef|Rig| | 1| 2| 3| =|
`-------------------------------------------------------------' |-------| |---------------|
^3|Kana|Gui|Alt|MHEN| Space |HENK|Alt|Gui|App|^2 | Down | | 0| ,| .| ^1|
`-------------------------------------------------------' `-------' `---------------'
^1: Enter on keypad is identical to Enter on alphanumeric portion.
^2: Right Alt is ALT on DIGITAL WAVE Dboard while Menu on PC-9821 keyboard.
App is HOME key on PC98XL keyboard.
^3: Caps and Kana are locking keys, either mechanically or by firmware emulation.
,---. ,---. ,------------------------. ,------------------------. ,------------------------.
| 60| | 61| | 62 | 63 | 64 | 65 | 66 | | 67 | 68 | 69 | 6A | 6B | | 52 | 53 | 54 | 55 | 56 |
`---' `---' `------------------------' `------------------------' `------------------------'
,-------------------------------------------------------------. ,-------. ,---------------.
| 00 | 01| 02| 03| 04| 05| 06| 07| 08| 09| 0A| 0B| 0C| 0D| 0E | | 38| 39| | 3E| 3F| 4D| 41|
|-------------------------------------------------------------| |-------| |---------------|
| 0F | 10| 11| 12| 13| 14| 15| 16| 17| 18| 19| 1A| 1B| | | 36| 37| | 42| 43| 44| 45|
|-------------------------------------------------------` 1C | |-------| |---------------|
| 74| 71| 1D| 1E| 1F| 20| 21| 22| 23| 24| 25| 26| 27| 28| | | 3A | | 46| 47| 48| 49|
|-------------------------------------------------------------| |-------| |---------------|
| 70 | 29| 2A| 2B| 2C| 2D| 2E| 2F| 30| 31| 32| 33| 70/7D | | 3B| 3C| | 4A| 4B| 4C| 4D|
`-------------------------------------------------------------' |-------| |---------------|
| 72 | 77| 73| 51 | 34 | 35 | 79| 78| 5E| | 3D | | 4E| 4F| 50| 1C|
`-------------------------------------------------------' `-------' `---------------'
5E: HOME on PC98XL keyboard
79: ALT on DIGITAL WAVE Dboard
77,78,79: Left Win, right Win and Application on PC-9821 keyboard
PC98 keyboard commands
----------------------
http://www.webtech.co.jp/company/doc/undocumented_mem/io_kb.txt
response from keyboard:
FAh: ACK
FCh: NACK
Inhibit repeating key:
9Ch, 70h
LED control:
9Dh 7xh
second byte:
0111 xxxx
|||`- NumLock
||`-- ?
|`--- CapsLock
`---- Kana
Enabling Win and App key on PC-9821 keyboard:
95h, 03h
Raku Raku keyboard support
--------------------------
NEC PC-9801-98-S02 - raku raku keyboard:
https://deskthority.net/photos-f62/nec-pc-9801-98-s02-t5212.html
To build firmware for the keyboard
$ make KEYMAP=rakuraku clean
$ make KEYMAP=rakuraku
$ make KEYMAP=rakuraku dfu
Its scan code map is very different from standard types. This is not tested.
Other PC98 converter projects and resource
------------------------------------------
PC-9800シリーズ テクニカルデータブック HARDWARE 編 1993年 p139, p343
https://archive.org/stream/PC9800TechnicalDataBookHARDWARE1993/PC-9800TechnicalDataBook_HARDWARE1993#page/n151
https://archive.org/stream/PC9800TechnicalDataBookHARDWARE1993/PC-9800TechnicalDataBook_HARDWARE1993#page/n355
PC98 to USB
http://davy.nyacom.net/kbd98usb/
PC98 to PS/2
http://www.tsp.ne.jp/~sawada/mago/c_gka98at.htm
http://www.tsp.ne.jp/~sawada/mago/src/gka98at.asm
scan code:
http://ixsvr.dyndns.org/usb2pc98
NOTES
-----
### Tested on
- PC-9801V
- DIGITAL WAVE Dboard
### RDY
Current firmware does not control RDY line and it is drived as low to receive data always. While sending command firmware drive the line high.
PC98 host keeps RDY line high to prevent keyboard from sending data while processing.
https://archive.org/stream/PC9800TechnicalDataBookHARDWARE1993/PC-9800TechnicalDataBook_HARDWARE1993#page/n359
### Inhibit key repeating
The command(9Ch, 70h) works with Raku Raku keybaord but not with Dboard.
### LED indicater
Dboard has LEDs but it seems to ignore LED control command.
