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7, TROUBLESHOOTING
START
Check CMOS S-RAM terminal voltage
Check S-RAM reading/writing.
(Usa
R!W
check program.)
NG
NG
RfW check program for the MZ-700
'0 INPi$F8,A:A=85
20 FOR
1=0
TO 32767
30 DU1#$FA,A:NEXT I
40 PRINT"READ":INp#SF8,A
50 FOR 1=0 TO 32767
Check battery voltage.
ChEick address decoder circuit.
Check S-RAM.
Check address counter drcuit.
60
INP~$F9,A:IF
A=65 THEN 80
70 GOTD 90
80 NEXT I :PRINT"CHECI< ... 01<" :END
90 PRINT"ERROR ... ADDRESS=" ;HEX$
[! ) ;
"H"
-3-
8, CONNECTOR SIGNAL TABLE
Interface Signals
Number
Input
Signal name
of
Polarity
or
Function
signals
output
*MREQ8
1
N
I
Memory request signal
.-
- -
--
*IORDS
1
N
I
liD request Signal
*RDB
1
N
I
Read command
*WRB
1
N
I
Write command
- -
ADS - A158
8
P
I
Memory or
1/0
address
select signal
DOB - D7B
16
P
I/O
Data 110 address select
signal
Interface pin locations
No.
A (parts side)
B (solder side)
1
2
3
4
5
6
7
8
S
10
11
12
13
14
15
16
17
18
19
20
21
22
22 ............ ..
22
+5 V
+5 V
02B
D3B
D1B
D4B
DaB
D5B
GND
D6B
A15B
D7B
A14B
A13B
A12B
"WRB
A,1B
*RDB
Al0S
*IORDB
AS8
*MREQ8
A8B
GND
A7B
AS8
A58
A4B
A38
A2B
A1B
AaB
GND
GND
(parts sidel
3.2, 1
3.2,1
parts side (AI
parts side (SI
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