3.6 Memory Test  3  Diagnostic Programs 
Satellite/Satellite Pro/C650D/C655D  Maintenance Manual 
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2.  Random Increment Read/Write 
This test item is to check whether the memory could be correctly accessed 
with randomized memory address and a series of incremental data. 
Subtest 10  Data Bus Test 
This test item is to check whether the data bus works normally. 
Subtest 11  Bus Noise Test 
This test item is to check whether the bus noise works normally. 
Subtest 12  Memory Speed Test 
This test item is to check the data-transferring rate for the cache memory and the 
system memory.