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Tandy 1400LT - Page 127

Tandy 1400LT
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Check
for
a
low
Pulse
at
Pin4
of
pPD72065 (IC54)
(CS765
signal)
qL
ormal?
Check
for
a
low
pulse
at
RD
(Pin2
of
IC54)
and
fi
(Pin3
of
IC54)
of
pPD72065.
Check
pulse
and
fi
for
a
low
at
RD
(Pin2
of
IC54)
(Pin3
of
IC54)
of
pPD72065.
I
Check
I
C3.
signal
(Pin8
of
Check the STEP/
and
DIRECTION/signa
(Pin10
of
IC561
I
Check
IC56,
STEPG5 (Pin47
of
GATE5)
DIRECG5
(Pin46
of
GATE5)
FDC37
(Pin37
of
IC56)
and
FDC39
(Pin39
of
IC56)
Perform
a
WRITE
operation.
Check
WRITE
DATA/
Check IC54
[and
IC56
Q
I
5-18

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