ZiLOG System 8000

HRM
Zilog
HRM
XONCHR XON Character %43F4
STACK
The character stored at this address is iriterpreted
by the input interrupt procedure as a character that
resumes output after XOFCHR is entered. When it is
read from the terminal, all output is resumed.
XONCHR is initialized to %11 (control-q).
Stack Pointer %40AO
This address is the base of the user stack set by
the Monitor Program at reset. The top of the stack
is %4000.
PSAREA Program status Area %4400
The
Program Status Area for· entering various
rupts and trap handling procedures starts
address. This area includes the program
blocks (FCW and PC) for different types of
rupts and traps. The Monitor Program sets up
program status blocks as shown in Table 5-3.
inter-
at this
status
inter-
these
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Zilog "
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