Tandy Radio Shack Realistic PRO-2004 Service Manual page 18

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KEYS ACCESS PULSE OUTPUT (IC-S03)
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10ms
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P06
P07
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NOTE: Use a signal at P01 of IC-S03 as trigger, and then observe the keys access.pulse when
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PROGRAM
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key is pressed. .
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DATA WAVEFORM (IC-S03)
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-1.I---OISPLAY OATA-----------z __,
'PLL DATA
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OISPLAY DATA
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Jr-'--
16.7ms
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----'..--------------
BUSY
(Pin 13)
LCD CS
(Pin 15)
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LCD C/O
(Pin 14)
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CLOCK
(Pin 19)
DATA
(Pin 20)
LT 1-
(Pin
17)
LT 2
(Pin 16)
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..,