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As Brendan suggests it is best to establish that the Gemini 1 RS233 port is working by connecting to a PC via USB to RS233 converter cable before trying to connect to anything else. Connecting to a PC is a lot easier because this is a well understood process and will confirm that the Gemini-1's RS233 port works.?
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Until you establish the fact that you have a working USB connection with a PC using a known good USB to RS232 converter and cable you will be banging you head and ours against a wall without any significant hope of success.??
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Chip Louie Chief Daydreamer Imagination Hardware?
? ?Astrospheric - South Pasadena?
Chip Louie