Figure 6-36.—Hardwired magnetic ROM.
For ROM operations to take place, the following
3. The ROM address is selected.
events generally take place in the following order:
4.
1. ROM is either selected on the computer’s front
panel or equivalent of a computer; or the
computer is turned on and it is part of the start
5.
up routine.
2. The ROM address is translated.
6.
The contents of the ROM address are sent to a
designated register for transfer to the instruction
register.
The instruction is sent to the instruction register
for translation.
The instruction is executed.
Figure 6-37.—MOS ROM.
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