I had some notes on the earlier serial cards, but not really a concise guide - now that these v1.1 are officially out, probably time to update that.
David has a version of his ROMTERM in the first thread here (at the moment this is version 1.26 from about August 2024):
viewtopic.php?t=7652
There is a 1.27 version, I'll ping him to see if he's ready to officially release that.
Do you have the Lazer3D case? This card will require the 90-degree "riser adapter" for the Lazer3D case. Because even with the top-lid off, the serial card won't fit in the Lazer3D due to the 9-pin serial cable adapter hitting the top of the rear panel.
And the card won't fit in the side-slot of the standard Lazer3D case. The blue base of the PCB won't clear the slot. I think a little side-slot extender should probably be-a-thing someday.
Once you have the card into any of the slots - the only other setup is attaching the antenna.
If you only want to null-modem cable connect to another systems or want to only use a WiModem-type device, then you don't need the WiFi-antenna stuff. But, >90% most folks will probably want to use the built in WiFi feature.
The WiFi/Serial card uses ZiModem (Zimmerman, not related to ZModem). So all its commands are documented at its github repo, available here:
https://github.com/bozimmerman/Zimodem
(with the main first command is "
AT+CONFIG" to setup the WiFi connection, the next useful is probably setting the baud rate).
The back of the Serial/Network card has a label describing the dip-switch settings. No real reason to adjust those, unless using multiple serial cards in the same system. ROMTERM will detect which port settings and highlight them.
If you selected a port and see "garbage" text characters, that usually indicates the wrong baud rate has been selected.
After that, you might be interested in BASTERM - it's not as feature-full (e.g. no ANSI, but can support CBM codes), and limited to lower speeds. But it's starter-code on how to programmatically access to the serial stuff on your own:
viewtopic.php?p=34240