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PC98 to USB keyboard protocol converter
=======================================
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Target MCU is ATMega32u2 but other USB capable AVR will also work.
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Connector
---------
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On host/converter:
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8Pin mini DIN
___ ___
/ |_| \
/ 8 7 6 \
| 5 4 3 |
\_ 2 1 _/
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\_____/
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(receptacle)
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Wiring: You can change this with editing config.h.
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Pin mini DIN MCU
----------------------------------
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1 ~RST(TXD) PD3
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2 GND GND
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3 ~RDY PD4
4 RXD PD2
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5 ~RTY PD1
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6 NC
7 NC
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8 5V VCC
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Protocol
--------
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Signal: Asynchronous, Positive logic, 19200baud, Least bit first
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Frame format: 1-Start bit(Lo), 8-Data bits, Odd-Parity, 1-Stop bit
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Build Firmware
--------------
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Just use 'make' to bild firmware for TMK PC98 converter.
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$ make clean
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$ make
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To flash firmware
$ make dfu
then push button on converter to flash firmware.
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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
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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
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PC98 keyboard commands
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----------------------
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http://www.webtech.co.jp/company/doc/undocumented_mem/io_kb.txt
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response from keyboard:
FAh: ACK
FCh: NACK
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Inhibit repeating key:
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9Ch, 70h
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LED control:
9Dh 7xh
second byte:
0111 xxxx
|||`- NumLock
||`-- ?
|`--- CapsLock
`---- Kana
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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
------------------------------------------
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PC-9800シリーズ テクニカルデータブック HARDWARE 編 1993年 p139, p343
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https://archive.org/stream/PC9800TechnicalDataBookHARDWARE1993/PC-9800TechnicalDataBook_HARDWARE1993#page/n151
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https://archive.org/stream/PC9800TechnicalDataBookHARDWARE1993/PC-9800TechnicalDataBook_HARDWARE1993#page/n355
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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
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NOTES
-----
### Tested on
- PC-9801V
- DIGITAL WAVE Dboard
### RDY
PC98 host keeps RDY line high to prevent keyboard from sending data while processing.
https://archive.org/stream/PC9800TechnicalDataBookHARDWARE1993/PC-9800TechnicalDataBook_HARDWARE1993#page/n359
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PC-9801V keyboard requires RDY pulse as acknowledgement from host, it doesn't next data without this. Dboard doens't need this.
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### Inhibit key repeating
The command(9Ch, 70h) works with Raku Raku keybaord but not with Dboard.
### LED indicater
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Dboard has LEDs but replys with FA to 9D command but ignore it. The LED indicates just its internal states. Dboard replays with FA to 9C command but it doesn't seem to understand repeat setting.
PC-9801V has no LEDs and doesn't accept LED command. It replys with 9D to 9D command. PC-9801V doesn't accept repeat setting command. It replys with 9C to 9C command.
## PC-9801V
Note that you have to connect this keyboard with converter before plug in USB port. It seems this keyboard requires for host to send any command before starting to send scan code.
