guidol Posted March 21, 2021 Share Posted March 21, 2021 (edited) The Z80-MBC2 is a 4-chip Z80-computer which can run CP/M and has a 5V TTL-serial-port. The Z80-MBC2 is powered and accessable via a USB-TTL-serial-adapter (configured to 5V - not 3.3V) type CP2102 seen as /dev/ttyUSB0 The easy way would be to connect the USB-adapter to a Pi-style computer wth armbian, login via SSH and start minicom for the port. But that way doenst look as good - to me - as the following way First we need to install ser2net and telnet (telnet doesnt seem to be installed as standard) in armbian via apt install ser2net telnet Then we have to edit /etc/ser2net.conf (delete all lines after the comments and insert these): BANNER:banner:\r\nser2net port \p device \d [\s] (Debian GNU/Linux)\r\n\r\n BANNER:z80mbc2:\r\nZ80-MBC2 via Telnet on Port [\p]\r\nDevice connected to [\d]\r\nConnection Speed [\s]\r\n # 2000:telnet:600:/dev/ttyS0:9600 8DATABITS NONE 1STOPBIT banner # 2001:telnet:600:/dev/ttyS1:9600 8DATABITS NONE 1STOPBIT banner # 3000:telnet:600:/dev/ttyS0:19200 8DATABITS NONE 1STOPBIT banner # 3001:telnet:600:/dev/ttyS1:19200 8DATABITS NONE 1STOPBIT banner 127.0.0.1,2023:telnet:0:/dev/ttyUSB0:115200 8DATABITS NONE 1STOPBIT z80mbc2 Now create a login "shell"/pogram for the new local user z80mbc2 as /usr/local/bin/z80mbc2 : #!/bin/sh /usr/bin/telnet 127.0.0.1 2023 exit Do a chmod 755 /usr/local/bin/z80mbc2 Now we can create the new local user z80mbc2 as seen on http://www.lug-wr.de/wiki/index.php/Howto:Network:SerialConsoleServer adduser --shell /usr/local/bin/z80mbc2.sh -q z80mbc2 If you havent done - connect your TTL-USB-Dongle to your SBC - and it should show up as /dev/ttyUSB0 : [354660.047087] usb 7-1: Product: CP2102 USB to UART Bridge Controller [354660.047099] usb 7-1: Manufacturer: Silicon Labs [354660.047109] usb 7-1: SerialNumber: 0001 [354660.112318] usbcore: registered new interface driver usbserial_generic [354660.112414] usbserial: USB Serial support registered for generic [354660.131499] usbcore: registered new interface driver cp210x [354660.131617] usbserial: USB Serial support registered for cp210x [354660.131902] cp210x 7-1:1.0: cp210x converter detected [354660.141405] usb 7-1: cp210x converter now attached to ttyUSB0 Now its time to reboot your SBC (I used my NanoPi K1 Plus) via reboot to automatically let start ser2net-service while booting Now when you connect to your SBC via SSH and use the z80mbc2 User to login, you should generate a automatic and local (127.0.0.1) telnet-login to Port 2023 where /dev/ttyUSB0 a.k.a the Z80-MBC2 device is configured. PS: other (german) interesting Page about ser2net: http://www.nwlab.net/tutorials/ser2net/konsolenserver-linux.html Z80-MBC2_SSH_Ser2Net.zip Edited March 27, 2021 by guidol added 127.0.0.1 - only localhost - to port 2023 1 Quote Link to comment Share on other sites More sharing options...
guidol Posted March 22, 2021 Author Share Posted March 22, 2021 If you want to use a "real" Terminal - instead of SSH / Ser2Net- like the TTGO VGA32 FabGL ANSI-Terminal and you dont have a 3.3V <-> 5.0V logic level converter available then using the NanoPi K1 Plus (or any other armbian device with 2 USB-ports) as a "mediator" may be possible using the "socat"-command To use socat we should disable (disable for every boot or stop until the next boot) the ser2net service: Usage: /etc/init.d/ser2net {start|stop|restart|reload|force-reload|status} sudo service ser2net restart sudo service ser2net stop sudo service ser2net start sudo systemctl disable ser2net sudo systemctl enable ser2net We do connect 2 USB-TTL-serial-Adapters to the SBC (one for 3.3V TTL-Level and one for 5V TTL-Level). Via software (socat = apt install socat) we tie them together: socat /dev/ttyUSB0,raw,echo=0,crnl,b115200 /dev/ttyUSB1,raw,echo=0,crnl,b115200 For the correct backspace-function the FabGL-ANSI-Terminal has to be in "ANSI Legacy"-Mode, because in normal "ANSI"-Mode the backspace-key doenst work right with the output of the Z80-MBC2 0 Quote Link to comment Share on other sites More sharing options...
guidol Posted April 28, 2022 Author Share Posted April 28, 2022 On 3/21/2021 at 9:52 AM, guidol said: Then we have to edit /etc/ser2net.conf In the newer version of ser2net (like v4.3.3-1) the /etc/ser2net.conf is replaced by the /etc/ser2net.yaml which has the yaml-format OK - here is a working version in yaml-format: # A fully featured configuration file is in # /usr/share/doc/ser2net/examples/ser2net.yaml define: &banner \r\nZ80-MBC2 via Telnet on Port [\p]\r\nDevice connected to [\d]\r\n connection: &z80mbc2 accepter: telnet(rfc2217),tcp,2023 enable: on options: banner: *banner kickolduser: true telnet-brk-on-sync: true connector: serialdev, /dev/ttyUSB0, 115200n81,local 0 Quote Link to comment Share on other sites More sharing options...
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