Servicing Personal Computers, 3rd Edition

Servicing the IBM

PC

and compatibles 231

Component pad view As viewed from

underside of component when mounted

on the board

PC Board view As viewed from the

component side of the PC board

? P

35

A

1

B

CLK F=j

V

CC Π

RESET p

-E

D

□

uioco-oiM^n ^»f ΙΛ — <r> .- r-. —

>QQQQDQQQQQ QQQQQQ

JUUUUUUUUUUUUUUUUUU

52 □

CAP

□ ERROR

Q BLÌSY

ΠΠΠΠΠΠΠΠΠΠΠΠΠΠΠΠΠΠ/,

<2

^>w|li8i5;2 2|£

Figure 6.12. 80286 pin connections

□ NC

□ INTR

□

NC

Q

NMI

P

v

ss

□ PEREQ

p^_

□ READY

□ HOLD

□ HLDA

Q COD/ÎNTÂ

H

M

'Q

1

M LOCK

OQQQQQQQQQQ

ri

TI

π n ii ii ii ι

Q Q Q Q Q >

CAP

ÊÏÏRÔR

BUSY

NC

NC

NC

PEREQ

V

c

_c_

READY

HOLD

HLDA

COD/INTÄI

M/IÖ

LOCK

LJl JLJtJlJLJLJ

I II II il

-Pin no. 1 mark ...