GH337 built-in calculator and RBS-info

Instructions how to enable the built-in calculator and rbs-info on a GH337.

Connect RS232 to phone via a TTL to RS232 converter.

[Dr Who's Note: It occurs to me that some older computers, such as the 
Commodore 64, use TTL levels already, so no conversions is neccessary with
them. It remains to be seen, however, if they can successfully do 9600 bps]

NOTE! You can NOT connect the RS232 directly to the phone,
      you MUST use a TTL to RS232 
converter!
      
        Pin 8   DC GND                           ->  ComPort GND
        Pin 11  RXD (TTL serial data TO phone)   ->  ComPort TXD
        Pin 12  TXD (TTL serial data FROM phone) ->  ComPort RXD

Connect external 5 volts to Pin 9 (FLASH 5/12volts input)
(Pin 6 SWDC5 [5 volts out] to pin 9 may also work, but have not tried it)

Pin 1 is leftmost pin (near Mic), when looking at the front/bottom.

Set ComPort to 9600bps, 8 data, 1 stop, no parity.

Power on phone by pressing "NO/ENDpwr".
When performing its powerup sequence the phone will send two ">>"
(ASCII 62 decimal) characters. Within 1 second, reply to it by
sending the 4 character sequence "TP1".

If everything whent fine you should get the "OK" prompt back.


Test the TEST PROGRAM by sending the commands terminated by a :

        PROG 0          (shows Test Program product number info)
        PROG 1          (shows Test Program product date info)
        PROG 3          (Shows Main Application product number info)
        PROG D          (Shows Main Application product date info)

To enable the built-in calculator and rbs-info, 
send the command:

        EEWR 047A 01

If you decide you don't like it, you can disable it with:

        EEWR 047A 00

Wait for the OK prompt, power off the phone and disconnect it from the 
interface cables. Powerup and browse thru the menus, enjoy.