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I have a couple of things I want to plug into my HP50g (GPS + an old DSO)

Is the serial port programmable via UserRPL or do I need to delve into SysRPL or even ARM for that?

I have a serial cable! :)

Communication subroutines to use the RS232 port

http://www.adictoshp.org/topic/214-hp484950-como-mando-de-control-de-perifricos-externos/

Excellent thanks for posting these. Rather neat code as well!