https://github.com/TurBoss/TurBoLink

TurboLink Opens Port UART1 from the UEXT and GPIO pin headers and allows you to send and receive data

https://agonconsole8.github.io/agon-docs/GPIO/

Check the releases page for binaries

https://github.com/TurBoss/TurBoLink/releases

Get z88dk development kit

• https://z88dk.org
• https://github.com/z88dk/z88dk
• https://github.com/z88dk/z88dk/wiki/installation

Obtain the source code using git.

Run make in the root directory of the project

git clone https://github.com/TurBoss/TurBoLink.git
cd TurBoLink
make

Should output this

z88dk-z80asm -mez80 -b -Iinclude -oturbolink.bin main.asm

turbolink.bin should have been created

Copy the bin file to any place on the SD card,

placing it on /MOS has issues don't place the bin there

/ *load turbolink.bin
/ *run

Using a modem to dial bbs servers

• Zimodem esp32 https://github.com/bozimmerman/Zimodem
• espressiff AT es8266 & esp32 https://www.espressif.com/en/support/download/at
• PicoWifiModem Easpberry Pi Pico W https://github.com/mecparts/PicoWiFiModem/
• tcpser PC + rs232 ttl adapter https://github.com/FozzTexx/tcpser

This may depend on your modem but should be similar to this

ATDTserver.address:port

Please refer to each modem At commands reference docs