Serial Port Downloads to 41CL

[rprosperi]

(02-25-2015 08:47 PM)rwiker Wrote:  

(02-25-2015 02:07 PM)rprosperi Wrote:  This is simple enough and a good idea; I found the section at the back of the CL manual late last night on the serial cable and had the same thought, though for a manufactured cable one wouldn't expect this type of problem. While I hope it's not this, I hope it is this, if you know what I mean.

Could it be that the cable you have is simply wrong for connecting the HP41CL to a PC-style RS232 port? I'm pretty sure I've heard of cables that that appear identical to the one that works for the HP41CL, but has different internal connections.

Back in 2011, one of the early HP41CL owners had problems that may have been caused by the cable (which was also a manufactured cable); I'm not sure if buying a new cable solved his problems.

The cable I'm using came from Monte, so it's the correct configuration. I just tested it with a multi-meter and it's OK, no shorts and Tip, Mid and Ring all connect to the appropriate DB9 pins.

I'm pretty convinced I must have damaged the wiring on the internal serial connector during assembly, but I'm plowing through all the other possibilities, testing, etc. because I'm learning a lot in the process. Once it's history, it will seem like it was fun, but right now, not so much

Thanks for your suggestions and comments.