[WP-34S] Cable and flashing options for Mac users

[Marcus von Cube]

(01-18-2015 08:30 PM)John Galt Wrote:  Any ideas?

I've had the best results with chips/cables from FTDI and the Windows based MySamba software. The problem seems to be the synchronization phase. The boot loader in the Atmel chip cannot use the xtal oscillator even if it is equipped. It therefore sends some trigger bytes at what it assumes to be 115kbit/s. It then gets back an answer (or not) and retries with a slightly modified oscillator setting. Maybe the Prolific chips just discard the sync data if the baud rate is off too far. So the Atmel boot loader never knows how to adjust the frequency because it never sees any response from the PC or Mac.

Just guessing, I'm afraid.