[comp.sys.handhelds] some 28S system questions

apm279l@vaxc.cc.monash.edu.au (10/16/90)

Hi,

(1) does anybody know the location in ROM of the RPL interpreter for
    the '28S? ie the routine which takes keypad input when not running
    user-programmes?

(2) I've found that the location C00EC changes as you use the machine
    and I've got a hunch it is used to store status info. Anyone know
    anything about that?

(3) I was wondering how interrupts work - all I know so far is that
    keyboard interrupts can be disabled/enabled with intoff/inton
    and that an interrupt vector is at the top of the RTN stack.
    However, I imagine the Saturn handles at least 3 interrupts
    (ON, RESET, MEMORY RESET), or does the one interrupt routine
    do all three?

Thanx, Peter

APM279L@VAXC.CC.MONASH.EDU.AU