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| Video Processor Board |
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| I/O | Description |
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| IICDATA | Data line for transferring the following information |
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| (I = input, O = output). The input data are associated with an |
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| interrupt pulse. |
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| I | VIDOK |
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| I | SWEEPOK |
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| I | BEAMDET |
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| O | BENABLE |
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| O | GENABLE |
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| O | RENABLE |
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| O | CH1SEL |
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| O | CH2SEL |
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| O | SLOAD |
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| O | VERTICAL FREQUENCY |
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| Input | Description |
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| /IICINT | Interrupt used to tell the SCB that the VPB has data to report. |
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| Video Processor Board |
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| Output | Description |
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| IICCLK | Clock signal for IIC data bus. |
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| +SERCLK | Serial data transfer clock. |
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| Serial data transfer clock. |
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| +SERDATA | Serial data transfer. Used to transfer the following command data: |
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| REDBIAS, GRNBIAS, and BLUBIAS to control the bias on |
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| the three (3) ILA® s respectively, RCONT, GCONT, and |
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| BCONT to control the contrast for the three CRTs, and |
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| BRIGHT to control the brightness for all three CRTs. |
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| Serial data transfer. |
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| BONSCRN | Output from the overlay interface used to turn blue overlay on and |
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| off. |
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| RONSCRN | Similar to BONSCRN. |
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| GONSCRN | Similar to BONSCRN. |
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| VONSCRN | Output from overlay interface used to turn external video on and |
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| off. |
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| VIDTEST | Video signal output for |
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| RSENS | Sensitivity output from the DAC at 0V to 1V with 140 ohm Zout. |
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| GSENS | Similar to RSENS. |
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| BSENS | Similar to RSENS. |
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| RTHRESH | Threshold output from the DAC at 0V to 1V with 140 ohm . |
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| GTHRESH | Similar to RTHRESH. |
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| BTHRESH | Similar to RTHRESH. |
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Model 330, 340SC and 370SC Service Manual |