NP-41 Emulator (may be)

[Chris Chung]

(12-14-2017 08:20 AM)Massimo Gnerucci Wrote:  

(12-14-2017 05:10 AM)Chris Chung Wrote:  if others receive their unit,

if ???

Pardon my english, not a native English speaker. I mean "when".
Jokes aside, when you received the unit. I would recommend the current steps.

1. insert battery (cold start)
2. press all keys and ensure they register
3. ON-CLR sequence to get into "MEMORY LOST" state
4. could just play around w/ some simple calculations
... new steps here
5. press ON to turn off (put to sleep) calculator
6. do a TAN+ON warm start (i.e. hold TAN and press ON to turn calculator on)

Step 6 is the only way to clear the ROM spaces. And there is no option to clear ROM spaces in cold-start except serial menu.

I am trying to back trace possible issues here. I had done a firmware upgrade to all the units a few days before I offered them on sale. The firmware upgrade might cause memory spaces corruption and lead to warm-start failure (emulator core failed to start but microcontroller still runs).

Of course it could be some other problems.

The fact that we see the NP41 indicates the h/w test is good, bootloader (runs before cold-start) and serial menu (runs at the NP41 prompt) should also be operational.

I hope I can solve this mystery soon and secure a stable platform.