CoolTerm
CoolTerm is free and is available for Windows, macOS, and Linux.
Setup for Z88 Communication
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Click Options on the toolbar. Pick your serial device (it will be a COM port for Windows users). Set baudrate to 38400 and enable CTS Flow Control.
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Click Connect in the toolbar. You will now see the serial port pin status updated in real time.
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Sending Files to Z88
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Receiving Files from Z88
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To minimise delays from handshake timeouts, the sending side should always be started before the receiving.