tmk
11 years ago
1 changed files with 44 additions and 58 deletions
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converter/pc98_usb/README
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| Sun to USB keyboard protocol converter | |||
| ====================================== | |||
| PC98 to USB keyboard protocol converter | |||
| ======================================= | |||
| Target MCU is ATMega32u4 but other USB capable AVR will also work. | |||
| Supported keyboards: Sun Type 5 Keyboard, CTCSP SHORT TYPE KEYBOARD(CKUB) | |||
| CTCSP SHORT TYPE KEYBOARD: http://imgur.com/a/QIv6p | |||
| Connector | |||
| --------- | |||
| 8Pin mini DIN | |||
| ___ ___ | |||
| / |_| \ | |||
| / 8 7 6 \ | |||
| | 5 4 3 | | |||
| \_ 2 1 _/ | |||
| \_____/ | |||
| (receptacle) | |||
| Connector | |||
| --------- | |||
| 8Pin mini DIN | |||
| ___ ___ | |||
| / |_| \ | |||
| / 8 7 6 \ | |||
| | 5 4 3 | | |||
| \_ 2 1 _/ | |||
| \_____/ | |||
| (receptacle) | |||
| Wiring: | |||
| Wiring: You can change this with ediging config.h. | |||
| Pin mini DIN MCU | |||
| ---------------------------------- | |||
| 1 GND GND | |||
| 1 ~RST PD1 | |||
| 2 GND GND | |||
| 3 5V | |||
| 4 RX/TX(Mouse) | |||
| 5 RX PD3 | |||
| 6 TX PD2 | |||
| 7 GND GND | |||
| 3 ~RDY PD4 | |||
| 4 RXD PD2 | |||
| 5 ~RTY PD5 | |||
| 6 NC | |||
| 7 NC | |||
| 8 5V VCC | |||
| Protocol | |||
| -------- | |||
| Singnal: Asynchronous, Negative logic, 1200baud, No Flow control | |||
| Frame format: 1-Start bit, 8-Data bits, No-Parity, 1-Stop bit | |||
| AVR USART engine expects positive logic while Sun keyboard signal is negative. | |||
| To use AVR UART engine you need exteral inverter in front of RX and TX pin. | |||
| Otherwise you can software serial routine to communicate the keyboard. | |||
| This converter uses software method, you doesn't need any inverter part. | |||
| Commands From System To Keyboard | |||
| 0x01 Reset | |||
| Keyboard responds with following byte sequence: | |||
| Success: 0xFF 0x04 0x7F | |||
| Fail: 0x7E 0x01 0x7F | |||
| 0x02 Bell On | |||
| 0x03 Bell Off | |||
| 0x0A Click On | |||
| 0x0B Click Off | |||
| 0x0E LED | |||
| followed by LED status byte: | |||
| bit: 3 2 1 0 | |||
| LED: CapsLk ScrLk Compose NumLk | |||
| 0x0F Layout | |||
| Keyboard responds with 'Layout Response' 0xFE 0xXX | |||
| Commands From Keyboard To System | |||
| 0x7F Idle | |||
| means no keys pressed. | |||
| 0xFE Layout Response | |||
| 0xFF Reset Response(followed by 0x04) | |||
| Reference | |||
| http://kentie.net/article/sunkbd/page2.htm | |||
| http://kentie.net/article/sunkbd/KBD.pdf | |||
| Singnal: Asynchronous, Positive logic, 19200baud, Least bit first | |||
| Frame format: 1-Start bit(Lo), 8-Data bits, Odd-Parity, 1-Stop bit | |||
| This converter uses software method for testing purpose. AVR UART engine will work better. | |||
| Build Firmware | |||
| -------------- | |||
| Just use 'make' | |||
| $ cd sun_usb | |||
| $ cd pc98_usb | |||
| $ make | |||
| Then, load the binary to MCU with your favorite programmer. | |||
| Other PC98 converter projects and resource | |||
| ------------------------------------------ | |||
| PC98 to USB | |||
| http://davy.nyacom.net/kbd98usb/ | |||
| PC98 to PS/2 | |||
| http://www.tsp.ne.jp/~sawada/mago/c_gka98at.htm | |||
| PC98 keyboard commands | |||
| http://www.webtech.co.jp/company/doc/undocumented_mem/io_kb.txt | |||