Figure 6-36.Hardwired magnetic ROM.
For ROM operations to take place, the following
events generally take place in the following order:
ROM is either selected on the computers front
panel or equivalent of a computer; or the
computer is turned on and it is part of the start
The ROM address is translated.
The ROM address is selected.
The contents of the ROM address are sent to a
designated register for transfer to the instruction
The instruction is sent to the instruction register
The instruction is executed.
Figure 6-37.MOS ROM.