Hi Chris,
Firstly thanx for this great project which brings the old tech back to future...
I have some questions if you can help me with
1- i am bit confused. Your sparkfun module is converting the usb signal to RS232 or to UART ?
Because, if it is rs232, then you could directly connect it to the connector with no solder. But from your solder, i see that you solder them to UART and you also mentioned that the module is usb to rs232 converter.
2-i have HP7550 which has RS232, HPIB and i will try your method with that one. Hence, if you have any documentation etc for HP7550, i would really appreciate that.
3- i also have a Mutoh IP210 which also has the RS232 port and is based on HPGL. I believe i can apply the same method to this one. Some documentation for this one would really help me, too.

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