WindTerm
WindTerm is free and is available for Windows, macOS, and Linux.
Setup for Z88 Communication
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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.
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Choose Serial Protocol, then configure Baud Rate to 38400bps and Flow Control as RTS/CTS.
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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
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To minimise delays from handshake timeouts, the sending side should always be started before the receiving.