HP41CL Serial Com Port Failure

[Neve]

(08-31-2022 04:14 PM)mfleming Wrote:  It seems the rom update itself isn't the source of the problem. If two 41CL's behave the same, I'd think the problem lies with the serial cable. The clupdate program would have errored out if it tried to open a nonexistent serial port. The only other possibility - a mismatched baud rate?

~Mark

Mark,

Yes, the 2 CL’s behave exactly the same. I have 2 serial cables that go from the CL to the UART serial to USB cable. I’ve tried the 2 cables and had the exact same results. The only culprit could be the UART serial to USB cable, or as Sylvain suggested, maybe the driver. That would be weird as it’s been working for ages, up until a month ago when I did the last update. Baud rate has always been the same since day one: 4800.

I have another application on Linux that needs that UART cable to receive screen dumps from a Tektronix 1GHz Digital Signal Analyser. I’ll try that later on. If that works, that would mean that the whole signal chain (cable wise) is good. That would also mean that the MacOS driver “might” have an issue. Linux uses a different one, so it won’t be affected….