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Managed to modify a 39gs into a 48gII
04-25-2015, 02:04 PM
Post: #1
Managed to modify a 39gs into a 48gII
Here are the results:
   
File manager, 256KB RAM:
   
Equation library:
   

Here are the instructions about how to modify (I'm not native speaker, sorry for my poor English):
1\ get a 39gs and a 48gii
2\ disassemble them
3\ connect your 48gii to computer via JTAG.
(the JTAG pin lies in J2 connector, which pinout is TCK TDI TDO TMS GND GND
4\ dump the ROM to your PC (2MB). (I used the SEGGER J-Flash software since I'm using SEGGER J-Link ARM-OB)
5\ desolder the original 39gs ROM chip (SST39VF800, 1MB)
   
6\ solder a new 2MB ROM chip (I used SST39VF160)
   
7\ connect your 39gs to computer via JTAG and flash the ROM which you have dumped in step 4.
8\ Enjoy~ May be a keyboard sticker is needed.
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Managed to modify a 39gs into a 48gII - Zweb - 04-25-2015 02:04 PM



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