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7000 series readout system: Difference between revisions
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===Scanning=== | ===Scanning=== | ||
The oscilloscope readout system produces a pulse train consisting of 10 successive negative-going pulses representing a possible character in a readout | The oscilloscope readout system produces a pulse train consisting of 10 successive negative-going pulses representing a possible character in a readout word. Each time-slot pulse is output at −15 V onto one of ten lines, labeled TS-1 through TS-10 (Time Slots 1 through 10), which are connected to the vertical and horizontal plug-in compartments. | ||
Two output lines, row and column, are connected from each channel (two channels per plug-in compartment) back to the oscilloscope readout system. Data is encoded on these output lines as a pair of analog current sequences in 100 μA steps from 0 to 0. | Two output lines, row and column, are connected from each channel (two channels per plug-in compartment) back to the oscilloscope readout system. Data is encoded on these output lines as a pair of analog current sequences in 100 μA steps from 0 to 0.9 mA for rows and 0 to 1.0 mA for columns, the combination of which can address a matrix of 11 × 10 positions. In this matrix, rows 1, 2, 4, 5 and 6 correspond to characters, whereas other rows are used to encode instructions: | ||
[[File:Tek7000-readout-charset.jpg|center|600px]] | [[File:Tek7000-readout-charset.jpg|center|600px]] | ||