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Microlevel computer hardware can be tested with greater ease and efficiency by using the microcode to provide direct access to various microlevel buses for use by macrocode instructions.
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Macrolevel Testing of Microlevel Architecture
Microlevel computer hardware can be tested with greater ease and efficiency
by using the microcode to provide direct access to various microlevel buses for
use by macrocode instructions.
For example, a macrocode diagnostic instruction can enable a small group of
microcode to provide access to microlevel buses. Macrocode instructions can
then read or write the various microlevel facilities, such as input/output registers,
interrupt registers and other processors. With this method, diagnostic tests
usually written in microcode can now be written in macrocode.
More thorough testing results since the microlevel facilities can be checked
with less reliance on the portion of the facilities visible at the macro architecture
level. This technique also requires less microcode control storage while
providing greater test flexibility because the instructions can be modified or
expanded more easily at the macrolevel than at the microlevel.