ROM stands for read-only memory. A
ROM chip is programmed with a permanent collection of pre-set bytes.
[
en
MICROPRO
]
Assuming that RAM starts at address 128 in this processor, and
ROM (which contains the assembly language program) starts at address 0, then for our simple microprocessor the assembly language
might look like this:
[
enHOW MICROPROCESSORS WORK ]
On a PC, the
ROM is called the BIOS (Basic Input/Output System). When the microprocessor starts, it begins executing instructions it finds
in the BIOS.
[
en
MICROPRO
]
LPD MCLH
21/03/2011
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