MCODE EPROM HARDWARE

[Neve]

Hi all,

I’ve started reading “HP-41 M CODE FOR BEGINNERS” by Ken Emery.
There he specifies some needed hardware to have, like ERAMCO MLDL, PROTOCODER II, EPROM BOX, etc…
Are these things even still available today? Do I really need them, or are there any more modern ways to save M CODE programs and transfer them to the calculator?

I’m completely new to this.

Thanks