Below is the connection diagram and sample test program, which shows how to use PSP-slim serial port to interface with gps devices like Holux gpslim236-240, M1000-1200 and others.
Following wire colors are used in the official PSP remote accesory cable, which can be used for this DYI project:
1 = gray
2 = yellow
3 = ---
4 = green
5 = ---
6 = ---
7 = brown
8 = orange
9 = blue
10 = --
11 = --
12 = --
audio:
^
[] white
[] red
[] copper
Here is the program in action with factory-made prototype cable, provided by pc-mobile.net:
The cable soon will be available for sale from their website.
The attached executable and source was tested on slim with M33 3.71-2 CW