IBM System/23 Datamaster: Difference between revisions
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For most cases it is not necessary having the probe, as the same values that are outputted through the service port are also written in the video memory, displaying the passed tests and the errors encountered. However, as the same tests that check the video display controller are the same routines that initialize it, all the tests made before the initialization cannot be seen in the screen until passed. In case some of them failed the screen would not be initialized and therefore the results wouln't be seen. For this reason the probe is still needed. | For most cases it is not necessary having the probe, as the same values that are outputted through the service port are also written in the video memory, displaying the passed tests and the errors encountered. However, as the same tests that check the video display controller are the same routines that initialize it, all the tests made before the initialization cannot be seen in the screen until passed. In case some of them failed the screen would not be initialized and therefore the results wouln't be seen. For this reason the probe is still needed. | ||
<youtube>UrLsx8ZtCpY</youtube> | <youtube width="320" height="200" float="right">UrLsx8ZtCpY</youtube> | ||
[[Category:Computers of IBM]][[Category:Computers of the United States of America]] | [[Category:Computers of IBM]][[Category:Computers of the United States of America]] | ||