NEW: HP 15C Collectors Edition

[Panchdara]

(11-02-2023 06:05 AM)Eric Rechlin Wrote:  To flash the calculator, here are the directions I found worked best:

1. Install SAM-BA.

2. Remove the battery door from the calculator and plug in the 6-pin connector from the cable.

3. On the cable, hold down Erase, then press and release Reset, then release Erase. This just puts the calculator in USB linking mode. Unlike on the 20b/30b, this won't actually erase your firmware, so you can safely do this even if you fail to connect in the later steps.

4. Plug the USB connector from the cable to your PC.

5. Wait for it to detect as a USB Serial Device. Then check Device Manager for the COM number; usually I saw COM4 or COM5.

6. Start SAM-BA, make sure the right COM port is selected, and select at91sam4l-ek as the board type:

7. Click Connect. A new window will appear, where you must enter 0x04000 as the address, pick the ROM file to upload, and then click Send File:

8. After the file is done transferring (less than 10 seconds), press the Reset button on the cable (or use the reset hole on the calculator) and then turn the calculator on.

If you have a problem anywhere prior to the point where you click "Send File", pressing the Reset button will let you get back to the "Pr Error" display without losing the firmware. If a failure occurs after clicking "Send File", then your calculator may not operate until you can successfully load a new firmware.

Thank you very much for this detailed step procedure. One question: Is there a point where the HP15 needs to be ON? Or can this procedure be done without the calc being ON?

Thanks! I'll be trying soon.