Paul Pennington wrote: Paul -- The personality module is a small plug in module with 1K or 2K of ROM/EPROM located between 0xC000 and 0xC7FF. On reset, the code would be executed there. The idea was that they you could plug in different ROMs for different situations -- say an assembler, and editor, a debugger, etc. In reality, it looks like they only made two monitors and one small variant -- called CONSOL (1K monitor), SOLOS (2K monitor), and BOOTLOAD (SOLOS minus the TERM command plus the BOOT command). Their literature talked about an editor module, but I've never seen one. The poor choice of the location for the personality module and the display RAM actually hampered CP/M since it put a hole in the middle of the 64K address space. Many applications used the personality module as a collection of routines that they could draw upon to make the application code smaller.