NEC PC-8201 - Page 62

5.3.3 BCR Interface Operation Test
( Preparation )
Connect the pin Figure 5.18 with the BCK connector.
( 1) BCR Interface Test Program
Test using the program in Figure 5.17.
If the BCR interface is normal. "BCR
TEST
OK" is displayed, or "BCR ERROR" is displayed.
The signal
in U27
(P6) changes from an "L" level to "H" level by connecting the circuit.
10 FOR N= 1 TO 255
20 A=INP( 187) AND 8
30 IF A AND 8 THEN PRINT N; ELSE GOTO 100
40
NEXT
50 PRINT :PRINT "BCR TEST OK" :END
100 PRINT :PRINT "BCR ERROR !!"
Figure 5.17 Test Program
1. BCR Connector 5
Figure 5.18 Pin Connection
I
Pin number
2
- 5
7
9
Signal name
R x DB
GND
GND
vcc