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Subject: Re: GDB and serial port
From: Joachim Schiffer (
Date: 2002-02-06

Hi !

In the Jukebox recorder, the TXD1 line is present at the
connector between the main and the interface board,
at pin 39. On the interface board, this pin is not
connected, as far as i know.
Since both units are very similar, maybe it's the same case
in the player?

By the way, this is actually a good idea, having a complete
serial port to connect to. This would make it possible to build
remote controls with a display :)


----- Original Message -----
From: "Nielsen Linus (ext)" <>
To: <>
Sent: Wednesday, February 06, 2002 1:05 PM
Subject: GDB and serial port

> Hi everyone!
> I am writing a Gnu Debugger stub for the jukebox, and
> I plan to use serial port 0 as the debugging port.
> This requires a modification to the Jukebox since
> only the Rx line is connected to the remote control.
> I have the following idea:
> - Cut the wires from the Line In connector.
> - Connect Rx and Tx to the Line In connector
> - Connect Line In to the PC via an external RS232 converter
> I have one small problem. The Tx line from the SH1 is probably
> not connected to anything on the circuit board, so I will have
> to solder a wire directly to the CPU pin itself. Not for the
> weak hearted, I know.
> Does anyone know if the Tx line is connected to anything, or do
> I have to dust off my magnifying glass?
> /Linus

Page was last modified "Jan 10 2012" The Rockbox Crew