Tandy 1400LT - External Keyboard Check

@ External Keyboard Check
Check if keyboard
connector is loose.
Check the keyboard
select signal
Pin17 of GATE4
I (High: External)
I
I
Check GATE4
Replace the
eyboard contro
Check the keyboard
data Pin2
of CN2.
Check the keyboard
CLK Pin1 of CN2.
Check IC52 and IC53.
I ---
I
I
I Check GATE4.1
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