NEC PC-8201 Service Manual page 59

5.3.2 S 1 0 2 Port Operation Test
Preparation
Connect the pin in Figure 5.14 with 9 0 2 connector.
(
I
)
S I 0 2 Port Test Program
Test using the program in Figure 5.13.
Repeat to transmitlreceive the data (Addresses
&M1
t o SiHFF), and display the
received data on the monitor, then compare it with the transmitted data. If it is
normal, 5 1 0 2 TEST
OK"
is displayed.
or "SI02
ERROR" is displayed.
You can confirm the signal in Figure 5.1 5 in P2 and P3 of the S102 connector.
10 OUT 144.64:OUT 2 1 6 . 2 7
2 0 OUT 1 8 8 , 3 :OUT 1 8 9 , 6 4 :PRINT CHR%( 12)
3 0 FOR A = l TO 2 5 5 :OUT 2 6 0 , A : B = I N P ( 2 0 0 )
3 1 ' V = I N P ( 2 1 6 > AND 4 : I F A=4 THEN LPRINT "OKK";
40 I F A < > B GOTO 8 0 ELSE PRINT B;
6 0 NEXT
70 PR1NT:PRINT " S I 0 2 TEST OKM:END
8 0 PR1NT:PRINT
" S I 0 2 ERROR! ! " :END
-
Figure 5.13 Test Program
-
S102 6-pin DuPont BERG modular jack
S102 CONNECTOR
Figure 5.14
I
Connected Circuit
Pin number
1
--
2
-
3
4
5
6
Signal name
GND
TxD
RxR
RTS
CIS
Vcc