Introduction I had an old Baycom without any use. Interest to APRS arised for some time ago. Therefore, it was quite obvious to use the old Baycom design with a PIC based controller. The PIC based controlled is based on PIC-E design. Design I made some changes to PIC-E hardware. I added possibility to connect an external device for displaying the data. The idea of using those new java based cellulars to display the APRS data via their RS232 connector came to my mind .... Can you help me to program such a java program ? I removed the microphone support. This means that this device, when connected to the the radio, cannot be used simultaneously for talking and sending of the APRS data. The software programmed to PIC-E works with this hardware. I have tested the PIC-E 0.95 sw version without any problem. It is even included in this zip file (thanks to Byon Garrabrant, N6BG). I only copied the mx614.asm to tcm3105.asm which corresponds modem used in the Baycom. I made the needed changes in pic-e.asm file in the include section. Construction The construction is made to be fitted inside the DB25 connector to minimise the space. The dc voltage to run this construction is from +9VDC to +15VDC. Current consumption is 23mA at +9VDC (PIC controller and Baycom). The dc voltages for Baycom and external device (+5V) and GPS (+3.3V) are supported. Before connecting any device, check that the voltages are correct for your device. The pic can be on-circuit programmed. Software issues Before compiling this software, change your callsign in options.asm file. After compilation, program the pic-e.hex file to your pic. I used the PicProg program to program the device. Some of the files are converted to pdf. Unfortunately, I didn't succeed to convert the PCB files (pic_top.ps and pic_bot.ps) to pdf maintaining the correct aspect ratios. Check your print copies before using them that they have correct aspect ratios. 73 de Petri oh4mvh/sm0xdo email: oh4mvh@oh3tr.ele.tut.fi 01/06/2003