HP MC68040 User Manual page 550

Chapter 12: Emulator Error Messages
Interrupt stack is located in ROM: <address> (Error 151)
Interrupt stack is located in ROM: <address> (Error 151)
Cause: You issued a command to run the target program, but when the emulator
attempted to write to one of your stacks, it detected that the stack address is in
memory mapped as ROM, and you enabled breaks on writes to ROM.
The monitor exits your target program by executing an RTE instruction.
Depending upon whether or not you set the M bit in the SR, the monitor will either
place a format $0 stack frame on the interrupt stack or will place a format $1
(throwaway) stack frame on the interrupt stack and a format $0 stack frame on the
master stack. Any access violations detected during these writes will abort the exit
from the monitor.
Action: Use the display registers and modify registers commands to set the stack
pointer to an even value that points at a memory region (emulation or target RAM)
that can be used for stack operations before running your program. Or, you can
modify the emulation configuration and respecify the memory map to RAM for the
address range containing the interrupt stack, the master stack, or both.
Interrupt stack pointer is odd or uninitialized (Error 151)
Cause: You are in the monitor and you tried to run, but the emulator detected that
your stack pointer is invalid (it detected an odd value).
Action: Use the display registers and modify registers commands to set the stack
pointer to an even value that points at a memory region (emulation or target RAM)
that can be used for stack operations before running your program.
Insufficient emulation memory (Error 21)
Cause: You tried to map more emulation memory than is available.
Action: Check your map specification. Do not try to map more emulation memory
than is available in your system. You can install up to 2 Mbytes of memory in your
system.
520