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Test Program 4 is used to write and read various patterns from the Display Memory @ and
to read the Character Stroke Memory 0. An explanation of Test Program 4 is located in the
"A3 Digital Storage Troubleshooting" tab. This test requires that the Digital Storage input
bus be good (there are no shorted Digital Storage data lines). This could show up as incorrect
inputs to the memory address registers U15 and U16.
3
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