How can .MOD/.ROM files be loaded in a real HP-41?
Without special hardware, they can’t! Furthermore, much of this special hardware is hard to find and commands high prices. ROM images must reside in some sort of plug-in device, either the original module or a special storage device. In the HP-41 world, such a device is called “MLDL” (Machine Language Development Lab). An MLDL is a ROM emulator, to fool the HP-41 into thinking a real module has been plugged-in and make the development of custom code possible. A number of MLDLs have been made over the years by different people/companies ranging in features, capacity and technology. One older type accepts standard EPROM chips, which are burned on a PC development machine. W&W Software Products and Eramco both produced RAM based devices which were built into card reader shells. More recently, Diego Diaz developed the Clonix-41 and NoVRAM modules based on PIC microcontrollers and programmed with a special serial port fixture. Also, Meindert Kuipers developed the very advanced card reader s
