You can also use a WiModem to connect to the Internet. The WiModem is a microcontroller with an RS-232 interface, and it's very useful on systems like the Altair Clone. I've started using one, since it lets me connect to the Altair from across the room, and I can leave the system on my dresser, where it lives these days.
I use this unit by Jim Drew:
https://www.cbmstuff.com/proddetail.php ... dem232OLEDand a 3D printed case from COREi64
https://corei64.com/shop/index.php?rout ... uct_id=117To make this work, you do need a couple of additional components. Since the Altair is wired as a DCE device (like a modem), it needs a male-male DB25 cable and a null modem adapter. It also needs 5v power. Rather than use an external power adapter, I got a small USB regulator. It was originally intended to hook up a Raspberry Pi, but it also works for the WiModem.
here's an example:
https://www.amazon.com/dp/B00CGQH1RQ/You can also use the WiModem on the second serial port for dialing out to other systems... it acts just like a Hayes modem from back in the day; you can connect to other nodes with the ATD command, and you can answer an incoming call with ATA. This makes it nearly 100% compatible with legacy terminal software. The only software that doesn't work is software that tries to be too smart and filter text out of the dial string (Telemate did this; it converted letters to their telephone keypad numeric equivelant.)