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North Star HSIO-4
2.
Ensure that the original Configuration
Header is in place. The pins should be
connected as follows:
pin 1 to pin 16
pin 2 to pin 15
pin 3 to pin 14
pin 4 to pin 13
pin 5 to pin 12
pin 6 to pin 11
pin 7 to pin 10
pin 8 to pin
9
3.
Remove the 1488 for the port and replace
it with a header constructed as follows:
a.
Connect a 2N3904 transistor to the 14-pin
header with the E lead connected to pin 7,
the B lead connected to pin 5, and the C
lead connected to pin 6.
b.
Solder a 5.6K ohm 1/4 Watt resistor
(green-blue-red) between pin 4 and pin 12
on the header.
c.
Solder a IK ohm 1/4 Watt resistor
(brown-black-red) between pin 8 and pin 14
on the header.
4.
Connect a 25-pin D-type connector to the
terminal cable as follows:
pin 9 to the printer "+" lead
pin 3 to the printer
pin 2 to the keyboard "+" lead
pin 10 to the keyboard
34
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X
X
\
X
" V
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i '
7 \
6 1
5 \
4 '
3 )
u j
1 4
11
12
13
1 5 /
16
J.
L —
V i—
Figure 3-11
lead
lead
User/Technical Manual
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