NP-41 Emulator (may be)

[Chris Chung]

(12-11-2017 11:17 PM)Sylvain Cote Wrote:  [*]boot loader mode [USER] in startup program -> lost the calculator at that point

• remove battery + re-insert battery -> startup program -> works
• initial tests (version, key scan, beeper & display) -> works
• return to calculator mode [ON]+[ON] -> failed, blank screen
• I have never plugged any USB cable to the calculator, I only done keyboard manipulation
  

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Help!

Sylvain

When you are in bootloader mode, screen blank is expected as the bootloader must be very small code size, the main firmware space is to be overwritten. You will only know it's running via the serial terminal with one single prompt. This is by design.

I hope that the ON-ON command works but it is just that the screen buffet did not get updated so you don't see it.

Please try to view the display in an angle and toggle ON to see if there are ghosting on the display. Sometimes it takes a few press on the ALPHA, CLR, and or the ENTER key before it refreshes. You can also reinsert the battery and use ON-CLR to do a memory lost reset. Please leave battery out a few seconds as sometimes the capacitor will hold charge and avoid a true hardware reset.

I am on my phone right now and will reply more. Had did testing on the serial menu, will report.