making HP39GS Serial Cable (RS-232)

[ilkka777]

Hello

What is the proper type of HP39GS serial port connector, does anyone know? Looked for Fuji 4P Mini-B USB cables (usb2-119fcam) but it looks like to be not very good.

I managed to build serial cable between two 39GS's using quite inexpensive Fuji Cables. Warning! I also managed to fry one of my calculators when connecting it to my mac. It is risky, eventhough cable connector do get into after "removing some plastics" it is not perfect fit and looks like it might lead to short circuit as I did. The connectors do not fit so it can be somewhat not straight, which is of course bad.

What I did was to buy 2 Fuji cables, and female-to-female usb connector. Also I opened one of the cables and connected white and green wires (data+ and data- in usb cables, which are the pin numbers #2 and #3, and also are connected to HP39GS rs-232 port's data recv and send pins) in order to get crossover cable. Then I put all these together with calculators, and send the Snake game to other calculator using "send/receive to HP39GS (serial)" functionality. First it didnt work, because of apparent short-circuit or other stuff but then it finally started sending when I managed to get connectors straight and the "cross-over" connection better (didnt solder for this demo!).