You also have IRAM and SFR space. Anyone who has worked with multiple microprocessor/microcontroller chips will recognize SFR space as I/O space, since that's what it is. So ... there's internal code space, external code space, internal ram, which consists of stack and internal register space, and external ram (XRAM), which, oddly enough, can be both internal and external. It's no wonder some folks get confused. That's more spaces than a Pentium has.

Say ... Andy ... where does that backslash come from? I've seen a leading slash, a trailing '*', a leading or trailing '-', and, of course, the widely used and edif-compatible leading 'n', but never the trailing backslash.

BTW, shouldn't we be encouraging the O/P to read some datasheets?

RE