WindTerm

WindTerm is free and is available for Windows, macOS, and Linux.

Setup for Z88 Communication

Open

New Session, then pick the Serial tab at the top. Pick your serial device (it will be a COM port for Windows users). Leave "Data" set to binary.

Open

Choose Serial Protocol, then configure Baud Rate to 38400bps and Flow Control as RTS/CTS.

Open

Finally, select X/Y/Z modem on the left, then set the drag & drop default protocol to YModem. Note the default Packet Size is 1024. The 'Upload Command' here is irrelevant since we are not sending files to a remote shell.

Sending Files to Z88

Now you can simply drag and drop a selection of files onto the WindTerm window to send them to the Z88.

Receiving Files from Z88

Open

To receive files from the Z88, it's Tool > Transfer Binary > Receive YModem.