Servicing Personal Computers, 3rd Edition

244 Servicing Personal Computers

IOB C

CLK C

S1 C

DT/R C

ALE C

ÂËN"

C

MRDC C

AMWCC

MWTC C

GND □

1

2

3

4

5

6

7

8

9

10

^ 20

19

18

17

16

8288

15

14

13

12

11

'

V

CC

D SO

1 S2

D

MCE/PDTN

1 DEN

D CEN

3 INTA

D IORC

1 AIOWC

D IOWC

Figure 6.30. 8288 pin connections

Useful memory locations

A number of memory locations can be useful in determining the current state of a PC or

PC-compatible microcomputer. The contents of these memory locations (summarised in Table

6.7) can be displayed using the MS-DOS debugger (DEBUG) or using a short routine written in

Table 6.7 Useful PC memory locations

Address location Number of bytes Function

0410

0413

0417

043E

2 ...