NEC PC-8201 - Page 54

5.2.3 CPU (80C85) Operation Test
XI VDD
X 2 2
RESET OUT 3
SOD 4
SI D 5
TRAP 6
RST7.5 7
RST6.5 8
RST5.5
9
INTR 10
-
INTA 11
ADO 12
AD1 13
AD2 14
AD3 15
A D4 16
AD5 17
AD6
18
AD7 19
GND 20
HOLD
HLDA
CLK
RESET
READY
101M
S1
-
R D
-
WR
ALE
SO
A1
5
A14
A1
3
A1 2
A1 1
A10
A9
A8
Figure 5.2 80C85 Terminal Connection (Top view)
(1) 80C85 Terminal Signals
When turning on
the PC-8301 power siipply or depressing the reset switch. if each
terminal of
U17 (80C85) operates correctly, you can confirm the p~llse changing to
the opposite level at each terminal.
Following signals are like next.
RESET
(P36)
"13" level (+5 V)
RESET OUT
(P3)
"L" level (+O V)
I-I LDA
(P38)
"L" level (+O V)
TRAP
(P6)
"L" level (+O V)
VDD (+5 V)
(P40)
"H" level (+5 V)
GND
(P20)
"L" level (+0 V)
Thcn the contents of Figure 5.3 arc displdyed on the monitor.