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Chapter 2---System Description
GRN_THRES Similar to RED_THRES
BLU_THRES Similar to RED_THRES
I/O DESCRIPTION
IIC_DATA IIC data line. Bidirectional serial line for synchronous data
transfer between SCB and other circuit boards. See detailed
description for list of signals transferred and data direction
IIC_CLK IIC clock line. Unidirectional clock line for control of
synchronous data transfer over IIC bus.
IIC_INT Interrupt output to SCB
Raster Timin
g
Generator
INPUT DESCRIPTION
CLAMP Pulse signal input from the RTG board. Indicates the commanded
timing and duration of the DC RESTORE.
BLANKING Pulse signal input from the RTG board. Indicates the commanded
BLANKING interval during the scan.
OUTPUT DESCRIPTION
H_SYNC Horizontal sync signal to RTG board
V_SYNC Vertical sync signal to RTG board
GRN_SYNC Green sync signal to RTG board
GRN_INPUT Green video signal to RTG board
V
ideo Amplifier
INPUT DESCRIPTION
RED_BEAM Voltage signal proportional to cathode current averaged
over several horizontal lines in the red CRT. Voltage
level is + mV/µA
GRN_BEAM Similar to RED_BEAM
BLU_BEAM Similar to RED_BEAM
/VA_OK Issued from the VAB to indicate VAB working properly
Model 200 Service Manual 2-27