HP41 : Zenrom Synthetic programming : Syntext

[highfell]

I have been trying to enter Synthetic programming instructions using the Zenrom Alpha Shift Alpha keys.

I wanted to enter STO M into a Program but I can’t find a way to. I assumed that the Hex numbers to enter are 91, 75; but when I do that then I get a Text T followed by two filled circles.

Alternatively entering STO first just gets me to STO IND when I press Shift next.

I have read the Zenrom manual , but it doesn’t help me to find the answer.

Can someone help me please ?