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Tandy 1400LT Service Manual page 177

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User manual (86 pages)

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ITR,

FPp

I

I

I

I

I

74HC 125

I

3 2

11

+5v

I .

BUS

I

I

I

I

I

-

I

(12. 14, 15, 17)

(3.

4, 15)

BAO

(14)

m

(4, 8, 14, 15)

EJll?

(4, 8, 14, 15)

8sR

+ 5 v

I A3

I A 4

I A5

IA6

I A 7

I A 8

IA9

I A I O

I A l l

IA12

I A 1 3

IA14

IA15

IA16

IA17

I A I 8

IA19

I R Q O

I R Q 1

IRQ2

I R Q 3

IRQ4

IRQ5

IRQ6

IRQ7

(1)

RST

(1)

CLK

I

RST

RDY

3-u

-sT

- E

QSO

QS

1

TEST

F m i K

--------

-

C 1 3

IC10

I

BRST

I

I

C14

I

I

I

5

6

I

(14)

I

T

I

BCLK

I

I

I

I

I

I

(I7)

ECLK

I

I

IC8

-

11

R7,

R81

83

C l 1

14

GND

2o

/ I C 9

NO. 2

7-2

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