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Chapter 2—Functional Description
Model 330, 340SC and 370SC Service Manual 2-67
Table 2-12
System Controller Board I/O Signals
Video Processor Board
I/O
Description
IICDATA
Data line for transferring the following information
(I = input, O = output). The input data are associated with an
interrupt pulse.
I VIDOK
I SWEEPOK
I BEAMDET
O BENABLE
O GENABLE
O RENABLE
OCH1SEL
OCH2SEL
O SLOAD
O VERTICAL FREQUENCY
Input
Description
/IICINT
Interrupt used to tell the SCB that the VPB has data to report.
Video Processor Board
Output
Description
IICCLK
Clock signal for IIC data bus.
+SERCLK
Serial data transfer clock.
-SERCLK
Serial data transfer clock.
+SERDATA
Serial data transfer. Used to transfer the following command data:
REDBIAS, GRNBIAS, and BLUBIAS to control the bias on
the three (3) ILA®s respectively, RCONT, GCONT, and
BCONT to control the contrast for the three CRTs, and
BRIGHT to control the brightness for all three CRTs.
-SERDATA
Serial data transfer.
BONSCRN
Output from the overlay interface used to turn blue overlay on and
off.
RONSCRN
Similar to BONSCRN.
GONSCRN
Similar to BONSCRN.
VONSCRN
Output from overlay interface used to turn external video on and
off.
VIDTEST
Video signal output for gray-scale. Real time data at 0V to 1V.
RSENS
Sensitivity output from the DAC at 0V to 1V with 140 ohm Zout.
GSENS
Similar to RSENS.
BSENS
Similar to RSENS.
RTHRESH
Threshold output from the DAC at 0V to 1V with 140 ohm .
GTHRESH
Similar to RTHRESH.
BTHRESH
Similar to RTHRESH.