41CL MMU Reset upon serial cable insert/remove

[ElectroDuende]

(02-26-2015 02:04 PM)rprosperi Wrote:  A careful re-reading of the manual indeed says clearly that the 2.5mm plug should be inserted into the 41CL prior to connecting the DB9 end to the PC. I will test this tonite to see if it works w/o MMU reset, but I'm confidant it will work OK.

I don't have a CL, but I suspect where the problem can come from. In a jack type connector, the pins are mis-connected while the jack is inserted (the tip will touch the base and sleeve contacts while traveling inside), so unexpected signals can arrive to the calculator. On the other side, in a DB9 connector a pin will never contact any other one during the connection process.