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556: Difference between revisions
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→The 556 Story, as recalled by engineer Phil Crosby in September 2020
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[[Oliver Dalton]], [[Bob Rullman]], [[Gene Kauffman]], and [[George Smith]] had done the [[544]], [[546]], and [[547]] mainframes | [[Oliver Dalton]], [[Bob Rullman]], [[Gene Kauffman]], and [[George Smith]] had done the [[544]], [[546]], and [[547]] mainframes | ||
and they felt that the 556 would be a walk in the park. | and they felt that the 556 would be a walk in the park. | ||
Oliver had dreamed up the sweep switching trick for the 547 and felt that a dual beam 'scope should be able to present the same sort of display, | Oliver had dreamed up the sweep switching trick | ||
<ref>In "ALT" sweep mode on a 547, with a compatible plug-in such as a 1A1, input channel A is displayed using the A sweep and input channel B is displayed using the B sweep. This has value when probing two signals that fundamentally operate at different timescales, for example the IF and AF (or video) of a superhet receiver. However, since there is only one beam it is easy to determine when to switch channels in “ALT” mode. | |||
</ref> | |||
for the 547 and felt that a dual beam 'scope should be able to present the same sort of display, | |||
but these people had more important things to do, so the 556 project got handed to the TV group under [[Charlie Rhodes]] in the belief that, | but these people had more important things to do, so the 556 project got handed to the TV group under [[Charlie Rhodes]] in the belief that, | ||
except for the power supply, which would be a difficult packaging job, requiring efficient heat removal, | except for the power supply, which would be a difficult packaging job, requiring efficient heat removal, | ||