I'm basing my monitor on the popular Paulmon2 which, in its expanded version, is already equipped with a disassembler. I do want to stick with a line-by-line approach so as to avoid the tasks of symbol table management and the associated phase management, since symbol table management requires a two-pass approach, in general.

Line editing is also incorporated in Paulmon2, so that's all I expect to include. I guess I've been spoiled by the decades of exposure to the Motorola debuggers, which, due to their overlapping code and data space, have always had line0by-line assembly features in their debug monitor programs. Since I generally need this feature for patching code, and since most of the newer microcontrollers are FLASH based, hence, allow writing of the code space, a simple line-by-line approach will be adequate.