HP 7750 User Manual page 74

Note
Note
4-18 Configuring the Emulator
You cannot map internal RAM and SFR as guarded (grd).
You should map all memory ranges used by your programs before
loading programs into memory. This helps safeguard against loads
which accidentally overwrite earlier loads if you follow a map/load
procedure for each memory range.
Internal RAM and SFR
The emulator uses internal RAM of emulation processor to emulate
user program. When you direct the emulator to display the contents of
internal RAM (or SFR) area, the emulator breaks to the monitor and the
monitor program reads the contents of memory. Therefore, execution
of user program is suspended to perform your direction. However, you
can configure the emulator so that write cycles are performed to both
internal RAM (or SFR) and emulation memory. In this case, you can
see the data written to emulation memory without suspending program
execution.
To use this feature, you need to map these area to emulation RAM
(eram). When you do this, you can display the contents of emulation
memory with m command without suspending user program execution.
You still can display the contents of internal RAM by appending "@i"
to address specification in m command.
For example, to see the content of address 100 hex in internal RAM,
you can do both of the following:
M> m 100 (This command accesses emulation
memory)
M> m 100@i (This command accesses internal
RAM of emulation processor.)
When you don't map the internal RAM and SFR area to emulation
RAM, you can access the internal RAM and SFR without appending
"@i".