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==References==
<references />
Add discovery of software startup word
Peel back the lefthand sticker to reveal three holes that expose three gold pads on the RF reciever PCB. These pads directly connect to the EEPROM SCL and SDA lines as well as common ground in that order from left to right.
[[File:Programming_interface_pinout_pager.jogpng|thumb|Pinout of the back programming interface]]
===Programming Interface - Programmer===
*'''PL2303_Prolific_DriverInstaller_10311.exe:''' Self explanitory. Appears to be a normal installer. Unknown if modified in any way, most likely not.
*'''Uninstall.exe:''' Also self explanitory. Seems to be a standard Windows uninstaller.
====Software Startup====
Upon startup and entry of the software password, the program looks for a PL2303 Prolific based serial device attached to the computer. If found, the COM port is set in a registry key located in '''HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM'''
The software then outputs the following on the serial port before giving the "The Programmed Board not responding!" error:
<pre>GoldApollo5R </pre>
Which is the following in raw serial bytes
<pre>47 6f 6c 64 41 70 6f 6c 6c 6f 35 52 03 00 00 00 00 8a</pre>
I have tried replaying the same byte sequence in response, as well as sending just "Apollo" with no luck. There is definitely some reply word sent by the programmer itself, similar to the [http://n3ujj.com/TripMate_Self_Start_Modification.html DeLorme TripMate GPS which needs the word "ASTRAL" sent on it's RX pin to enable the GPS.]
*Channel spacing seems to commonly be set to 25 kHz, making the common DAPNET frequency of 439.9875 MHz<ref>https://hampager.de/dokuwiki/doku.php?id=dapnetfrq</ref> unable to be set without an error message. The pager can be set to use 12.5 kHz channel spacing, but requires the programming software to accomplish. The easiest solution without software access is to choose a different frequency while minding the amateur satellite band (435 - 438 MHz)<ref>https://www.iaru-r1.org/wiki/Amateur_satellites#:~:text=2%20meter%20band-,70%20cm%20band,maximum%20bandwidth%20is%20100%20kHz</ref>
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