Why does the backslash () character do strange things?
On the HP48, one could type a backslash (\) in a string and it would simply place the backslash character in the string. On the HP49, the backslash is a special control character. Also on the HP48, it was not possible to insert one quotation mark into a string, as it would act as a string separator. The only workaround was the “C$ $” trick. With the HP49, one can enter a single quotation mark in a string by preceeding it with a backslash ([Alpha]-[RightShift]-[5]). In order to insert a backslash into a string, you need to type two backslashes. The first backslash is treated as a control character and the second one is displayed in the string.
