The HP 34E Ir with PANAMATIK ACT

[Harald]

(09-23-2015 04:44 PM)Dave Frederickson Wrote:  Very nice, Harald!

Just last week I found on eBay a complete 34C "for parts". I'm considering modifying my 25E Ir, too. As the resident expert on USB cable adapters, what's the part number for the cable you used? With that type of plug I believe it's important to plug it into the calculator before pluging in the USB end, correct?

Dave

The cable is my WP34s flash cable prototype which I hacked from an old USB to RS485 adapter. But any USB to UART cable should do.

The USB needs to be plugged in first, the Calculator after starting Bernhards flash tool. This is necessary because of the way he gets into the bootloader.
You have to take care that Vcc is the last connection to be made on the jack. If this isn't the case you can (and will, as I found out the hard way) damage Bernhards ACT.