An RST by hardware
The instruction supplied by external device through the INTA signal
An instruction from memory location 20 H
None of these
RST 5.5
RST 7.5
TRAP
Both (a) and (b)
0000 H to FFFF H
0000 H to 5FFF H
4000 H to 5FFFF H
INTER
RESET IN
READY
lower the HOLD input
lower the READY input
raise the HOLD input